diff --git a/Tests/test_lib_pack.py b/Tests/test_lib_pack.py
index b4a300d0c59..ab9acd208e5 100644
--- a/Tests/test_lib_pack.py
+++ b/Tests/test_lib_pack.py
@@ -1,820 +1,835 @@
 from __future__ import annotations
 
-import sys
-
 import pytest
 
 from PIL import Image
 
+from .helper import is_big_endian
+
 X = 255
 
 
-class TestLibPack:
-    def assert_pack(
-        self,
-        mode: str,
-        rawmode: str,
-        data: int | bytes,
-        *pixels: float | tuple[int, ...],
-    ) -> None:
-        """
-        data - either raw bytes with data or just number of bytes in rawmode.
-        """
-        im = Image.new(mode, (len(pixels), 1))
-        for x, pixel in enumerate(pixels):
-            im.putpixel((x, 0), pixel)
-
-        if isinstance(data, int):
-            data_len = data * len(pixels)
-            data = bytes(range(1, data_len + 1))
-
-        assert data == im.tobytes("raw", rawmode)
-
-    def test_1(self) -> None:
-        self.assert_pack("1", "1", b"\x01", 0, 0, 0, 0, 0, 0, 0, X)
-        self.assert_pack("1", "1;I", b"\x01", X, X, X, X, X, X, X, 0)
-        self.assert_pack("1", "1;R", b"\x01", X, 0, 0, 0, 0, 0, 0, 0)
-        self.assert_pack("1", "1;IR", b"\x01", 0, X, X, X, X, X, X, X)
-
-        self.assert_pack("1", "1", b"\xaa", X, 0, X, 0, X, 0, X, 0)
-        self.assert_pack("1", "1;I", b"\xaa", 0, X, 0, X, 0, X, 0, X)
-        self.assert_pack("1", "1;R", b"\xaa", 0, X, 0, X, 0, X, 0, X)
-        self.assert_pack("1", "1;IR", b"\xaa", X, 0, X, 0, X, 0, X, 0)
-
-        self.assert_pack("1", "L", b"\xff\x00\x00\xff\x00\x00", X, 0, 0, X, 0, 0)
-
-    def test_L(self) -> None:
-        self.assert_pack("L", "L", 1, 1, 2, 3, 4)
-        self.assert_pack("L", "L;16", b"\x00\xc6\x00\xaf", 198, 175)
-        self.assert_pack("L", "L;16B", b"\xc6\x00\xaf\x00", 198, 175)
-
-    def test_LA(self) -> None:
-        self.assert_pack("LA", "LA", 2, (1, 2), (3, 4), (5, 6))
-        self.assert_pack("LA", "LA;L", 2, (1, 4), (2, 5), (3, 6))
-
-    def test_La(self) -> None:
-        self.assert_pack("La", "La", 2, (1, 2), (3, 4), (5, 6))
-
-    def test_P(self) -> None:
-        self.assert_pack("P", "P;1", b"\xe4", 1, 1, 1, 0, 0, 255, 0, 0)
-        self.assert_pack("P", "P;2", b"\xe4", 3, 2, 1, 0)
-        self.assert_pack("P", "P;4", b"\x02\xef", 0, 2, 14, 15)
-        self.assert_pack("P", "P", 1, 1, 2, 3, 4)
-
-    def test_PA(self) -> None:
-        self.assert_pack("PA", "PA", 2, (1, 2), (3, 4), (5, 6))
-        self.assert_pack("PA", "PA;L", 2, (1, 4), (2, 5), (3, 6))
-
-    def test_RGB(self) -> None:
-        self.assert_pack("RGB", "RGB", 3, (1, 2, 3), (4, 5, 6), (7, 8, 9))
-        self.assert_pack(
-            "RGB", "RGBX", b"\x01\x02\x03\xff\x05\x06\x07\xff", (1, 2, 3), (5, 6, 7)
-        )
-        self.assert_pack(
-            "RGB", "XRGB", b"\x00\x02\x03\x04\x00\x06\x07\x08", (2, 3, 4), (6, 7, 8)
-        )
-        self.assert_pack("RGB", "BGR", 3, (3, 2, 1), (6, 5, 4), (9, 8, 7))
-        self.assert_pack(
-            "RGB", "BGRX", b"\x01\x02\x03\x00\x05\x06\x07\x00", (3, 2, 1), (7, 6, 5)
-        )
-        self.assert_pack(
-            "RGB", "XBGR", b"\x00\x02\x03\x04\x00\x06\x07\x08", (4, 3, 2), (8, 7, 6)
-        )
-        self.assert_pack("RGB", "RGB;L", 3, (1, 4, 7), (2, 5, 8), (3, 6, 9))
-        self.assert_pack("RGB", "R", 1, (1, 9, 9), (2, 9, 9), (3, 9, 9))
-        self.assert_pack("RGB", "G", 1, (9, 1, 9), (9, 2, 9), (9, 3, 9))
-        self.assert_pack("RGB", "B", 1, (9, 9, 1), (9, 9, 2), (9, 9, 3))
-
-    def test_RGBA(self) -> None:
-        self.assert_pack("RGBA", "RGBA", 4, (1, 2, 3, 4), (5, 6, 7, 8), (9, 10, 11, 12))
-        self.assert_pack(
-            "RGBA", "RGBA;L", 4, (1, 4, 7, 10), (2, 5, 8, 11), (3, 6, 9, 12)
-        )
-        self.assert_pack("RGBA", "RGB", 3, (1, 2, 3, 14), (4, 5, 6, 15), (7, 8, 9, 16))
-        self.assert_pack("RGBA", "BGR", 3, (3, 2, 1, 14), (6, 5, 4, 15), (9, 8, 7, 16))
-        self.assert_pack("RGBA", "BGRA", 4, (3, 2, 1, 4), (7, 6, 5, 8), (11, 10, 9, 12))
-        self.assert_pack("RGBA", "ABGR", 4, (4, 3, 2, 1), (8, 7, 6, 5), (12, 11, 10, 9))
-        self.assert_pack(
+def get_pack_parameters() -> list[str, str, int | bytes, list[float | tuple[int, ...]]]:
+    params = []
+
+    # Mode 1
+    params += [
+        ("1", "1", b"\x01", [0, 0, 0, 0, 0, 0, 0, X]),
+        ("1", "1;I", b"\x01", [X, X, X, X, X, X, X, 0]),
+        ("1", "1;R", b"\x01", [X, 0, 0, 0, 0, 0, 0, 0]),
+        ("1", "1;IR", b"\x01", [0, X, X, X, X, X, X, X]),
+        ("1", "1", b"\xaa", [X, 0, X, 0, X, 0, X, 0]),
+        ("1", "1;I", b"\xaa", [0, X, 0, X, 0, X, 0, X]),
+        ("1", "1;R", b"\xaa", [0, X, 0, X, 0, X, 0, X]),
+        ("1", "1;IR", b"\xaa", [X, 0, X, 0, X, 0, X, 0]),
+        ("1", "L", b"\xff\x00\x00\xff\x00\x00", [X, 0, 0, X, 0, 0]),
+    ]
+
+    # Mode L
+    params += [
+        ("L", "L", 1, [1, 2, 3, 4]),
+        ("L", "L;16", b"\x00\xc6\x00\xaf", [198, 175]),
+        ("L", "L;16B", b"\xc6\x00\xaf\x00", [198, 175]),
+    ]
+
+    # Mode LA
+    params += [
+        ("LA", "LA", 2, [(1, 2), (3, 4), (5, 6)]),
+        ("LA", "LA;L", 2, [(1, 4), (2, 5), (3, 6)]),
+    ]
+
+    # Mode La
+    params += [("La", "La", 2, [(1, 2), (3, 4), (5, 6)])]
+
+    # Mode P
+    params += [
+        ("P", "P;1", b"\xe4", [1, 1, 1, 0, 0, 255, 0, 0]),
+        ("P", "P;2", b"\xe4", [3, 2, 1, 0]),
+        ("P", "P;4", b"\x02\xef", [0, 2, 14, 15]),
+        ("P", "P", 1, [1, 2, 3, 4]),
+    ]
+
+    # Mode PA
+    params += [
+        ("PA", "PA", 2, [(1, 2), (3, 4), (5, 6)]),
+        ("PA", "PA;L", 2, [(1, 4), (2, 5), (3, 6)]),
+    ]
+
+    # Mode RGB
+    params += [
+        ("RGB", "RGB", 3, [(1, 2, 3), (4, 5, 6), (7, 8, 9)]),
+        ("RGB", "RGBX", b"\x01\x02\x03\xff\x05\x06\x07\xff", [(1, 2, 3), (5, 6, 7)]),
+        ("RGB", "XRGB", b"\x00\x02\x03\x04\x00\x06\x07\x08", [(2, 3, 4), (6, 7, 8)]),
+        ("RGB", "BGR", 3, [(3, 2, 1), (6, 5, 4), (9, 8, 7)]),
+        ("RGB", "BGRX", b"\x01\x02\x03\x00\x05\x06\x07\x00", [(3, 2, 1), (7, 6, 5)]),
+        ("RGB", "XBGR", b"\x00\x02\x03\x04\x00\x06\x07\x08", [(4, 3, 2), (8, 7, 6)]),
+        ("RGB", "RGB;L", 3, [(1, 4, 7), (2, 5, 8), (3, 6, 9)]),
+        ("RGB", "R", 1, [(1, 9, 9), (2, 9, 9), (3, 9, 9)]),
+        ("RGB", "G", 1, [(9, 1, 9), (9, 2, 9), (9, 3, 9)]),
+        ("RGB", "B", 1, [(9, 9, 1), (9, 9, 2), (9, 9, 3)]),
+    ]
+
+    # Mode RGBA
+    params += [
+        ("RGBA", "RGBA", 4, [(1, 2, 3, 4), (5, 6, 7, 8), (9, 10, 11, 12)]),
+        ("RGBA", "RGBA;L", 4, [(1, 4, 7, 10), (2, 5, 8, 11), (3, 6, 9, 12)]),
+        ("RGBA", "RGB", 3, [(1, 2, 3, 14), (4, 5, 6, 15), (7, 8, 9, 16)]),
+        ("RGBA", "BGR", 3, [(3, 2, 1, 14), (6, 5, 4, 15), (9, 8, 7, 16)]),
+        ("RGBA", "BGRA", 4, [(3, 2, 1, 4), (7, 6, 5, 8), (11, 10, 9, 12)]),
+        ("RGBA", "ABGR", 4, [(4, 3, 2, 1), (8, 7, 6, 5), (12, 11, 10, 9)]),
+        (
             "RGBA",
             "BGRa",
             4,
-            (191, 127, 63, 4),
-            (223, 191, 159, 8),
-            (233, 212, 191, 12),
-        )
-        self.assert_pack("RGBA", "R", 1, (1, 0, 8, 9), (2, 0, 8, 9), (3, 0, 8, 0))
-        self.assert_pack("RGBA", "G", 1, (6, 1, 8, 9), (6, 2, 8, 9), (6, 3, 8, 9))
-        self.assert_pack("RGBA", "B", 1, (6, 7, 1, 9), (6, 7, 2, 0), (6, 7, 3, 9))
-        self.assert_pack("RGBA", "A", 1, (6, 7, 0, 1), (6, 7, 0, 2), (0, 7, 0, 3))
-
-    def test_RGBa(self) -> None:
-        self.assert_pack("RGBa", "RGBa", 4, (1, 2, 3, 4), (5, 6, 7, 8), (9, 10, 11, 12))
-        self.assert_pack("RGBa", "BGRa", 4, (3, 2, 1, 4), (7, 6, 5, 8), (11, 10, 9, 12))
-        self.assert_pack("RGBa", "aBGR", 4, (4, 3, 2, 1), (8, 7, 6, 5), (12, 11, 10, 9))
-
-    def test_RGBX(self) -> None:
-        self.assert_pack("RGBX", "RGBX", 4, (1, 2, 3, 4), (5, 6, 7, 8), (9, 10, 11, 12))
-        self.assert_pack(
-            "RGBX", "RGBX;L", 4, (1, 4, 7, 10), (2, 5, 8, 11), (3, 6, 9, 12)
-        )
-        self.assert_pack("RGBX", "RGB", 3, (1, 2, 3, X), (4, 5, 6, X), (7, 8, 9, X))
-        self.assert_pack("RGBX", "BGR", 3, (3, 2, 1, X), (6, 5, 4, X), (9, 8, 7, X))
-        self.assert_pack(
+            [(191, 127, 63, 4), (223, 191, 159, 8), (233, 212, 191, 12)],
+        ),
+        ("RGBA", "R", 1, [(1, 0, 8, 9), (2, 0, 8, 9), (3, 0, 8, 0)]),
+        ("RGBA", "G", 1, [(6, 1, 8, 9), (6, 2, 8, 9), (6, 3, 8, 9)]),
+        ("RGBA", "B", 1, [(6, 7, 1, 9), (6, 7, 2, 0), (6, 7, 3, 9)]),
+        ("RGBA", "A", 1, [(6, 7, 0, 1), (6, 7, 0, 2), (0, 7, 0, 3)]),
+    ]
+
+    # Mode RGBa
+    params += [
+        ("RGBa", "RGBa", 4, [(1, 2, 3, 4), (5, 6, 7, 8), (9, 10, 11, 12)]),
+        ("RGBa", "BGRa", 4, [(3, 2, 1, 4), (7, 6, 5, 8), (11, 10, 9, 12)]),
+        ("RGBa", "aBGR", 4, [(4, 3, 2, 1), (8, 7, 6, 5), (12, 11, 10, 9)]),
+    ]
+
+    # Mode RGBX
+    params += [
+        ("RGBX", "RGBX", 4, [(1, 2, 3, 4), (5, 6, 7, 8), (9, 10, 11, 12)]),
+        ("RGBX", "RGBX;L", 4, [(1, 4, 7, 10), (2, 5, 8, 11), (3, 6, 9, 12)]),
+        ("RGBX", "RGB", 3, [(1, 2, 3, X), (4, 5, 6, X), (7, 8, 9, X)]),
+        ("RGBX", "BGR", 3, [(3, 2, 1, X), (6, 5, 4, X), (9, 8, 7, X)]),
+        (
             "RGBX",
             "BGRX",
             b"\x01\x02\x03\x00\x05\x06\x07\x00\t\n\x0b\x00",
-            (3, 2, 1, X),
-            (7, 6, 5, X),
-            (11, 10, 9, X),
-        )
-        self.assert_pack(
+            [(3, 2, 1, X), (7, 6, 5, X), (11, 10, 9, X)],
+        ),
+        (
             "RGBX",
             "XBGR",
             b"\x00\x02\x03\x04\x00\x06\x07\x08\x00\n\x0b\x0c",
-            (4, 3, 2, X),
-            (8, 7, 6, X),
-            (12, 11, 10, X),
-        )
-        self.assert_pack("RGBX", "R", 1, (1, 0, 8, 9), (2, 0, 8, 9), (3, 0, 8, 0))
-        self.assert_pack("RGBX", "G", 1, (6, 1, 8, 9), (6, 2, 8, 9), (6, 3, 8, 9))
-        self.assert_pack("RGBX", "B", 1, (6, 7, 1, 9), (6, 7, 2, 0), (6, 7, 3, 9))
-        self.assert_pack("RGBX", "X", 1, (6, 7, 0, 1), (6, 7, 0, 2), (0, 7, 0, 3))
-
-    def test_CMYK(self) -> None:
-        self.assert_pack("CMYK", "CMYK", 4, (1, 2, 3, 4), (5, 6, 7, 8), (9, 10, 11, 12))
-        self.assert_pack(
+            [(4, 3, 2, X), (8, 7, 6, X), (12, 11, 10, X)],
+        ),
+        ("RGBX", "R", 1, [(1, 0, 8, 9), (2, 0, 8, 9), (3, 0, 8, 0)]),
+        ("RGBX", "G", 1, [(6, 1, 8, 9), (6, 2, 8, 9), (6, 3, 8, 9)]),
+        ("RGBX", "B", 1, [(6, 7, 1, 9), (6, 7, 2, 0), (6, 7, 3, 9)]),
+        ("RGBX", "X", 1, [(6, 7, 0, 1), (6, 7, 0, 2), (0, 7, 0, 3)]),
+    ]
+
+    # Mode CMYK
+    params += [
+        ("CMYK", "CMYK", 4, [(1, 2, 3, 4), (5, 6, 7, 8), (9, 10, 11, 12)]),
+        (
             "CMYK",
             "CMYK;I",
             4,
-            (254, 253, 252, 251),
-            (250, 249, 248, 247),
-            (246, 245, 244, 243),
-        )
-        self.assert_pack(
-            "CMYK", "CMYK;L", 4, (1, 4, 7, 10), (2, 5, 8, 11), (3, 6, 9, 12)
-        )
-        self.assert_pack("CMYK", "K", 1, (6, 7, 0, 1), (6, 7, 0, 2), (0, 7, 0, 3))
-
-    def test_YCbCr(self) -> None:
-        self.assert_pack("YCbCr", "YCbCr", 3, (1, 2, 3), (4, 5, 6), (7, 8, 9))
-        self.assert_pack("YCbCr", "YCbCr;L", 3, (1, 4, 7), (2, 5, 8), (3, 6, 9))
-        self.assert_pack(
+            [(254, 253, 252, 251), (250, 249, 248, 247), (246, 245, 244, 243)],
+        ),
+        ("CMYK", "CMYK;L", 4, [(1, 4, 7, 10), (2, 5, 8, 11), (3, 6, 9, 12)]),
+        ("CMYK", "K", 1, [(6, 7, 0, 1), (6, 7, 0, 2), (0, 7, 0, 3)]),
+    ]
+
+    # Mode YCbCr
+    params += [
+        ("YCbCr", "YCbCr", 3, [(1, 2, 3), (4, 5, 6), (7, 8, 9)]),
+        ("YCbCr", "YCbCr;L", 3, [(1, 4, 7), (2, 5, 8), (3, 6, 9)]),
+        (
             "YCbCr",
             "YCbCrX",
             b"\x01\x02\x03\xff\x05\x06\x07\xff\t\n\x0b\xff",
-            (1, 2, 3),
-            (5, 6, 7),
-            (9, 10, 11),
-        )
-        self.assert_pack(
+            [(1, 2, 3), (5, 6, 7), (9, 10, 11)],
+        ),
+        (
             "YCbCr",
             "YCbCrK",
             b"\x01\x02\x03\xff\x05\x06\x07\xff\t\n\x0b\xff",
-            (1, 2, 3),
-            (5, 6, 7),
-            (9, 10, 11),
-        )
-        self.assert_pack("YCbCr", "Y", 1, (1, 0, 8, 9), (2, 0, 8, 9), (3, 0, 8, 0))
-        self.assert_pack("YCbCr", "Cb", 1, (6, 1, 8, 9), (6, 2, 8, 9), (6, 3, 8, 9))
-        self.assert_pack("YCbCr", "Cr", 1, (6, 7, 1, 9), (6, 7, 2, 0), (6, 7, 3, 9))
-
-    def test_LAB(self) -> None:
-        self.assert_pack("LAB", "LAB", 3, (1, 130, 131), (4, 133, 134), (7, 136, 137))
-        self.assert_pack("LAB", "L", 1, (1, 9, 9), (2, 9, 9), (3, 9, 9))
-        self.assert_pack("LAB", "A", 1, (9, 1, 9), (9, 2, 9), (9, 3, 9))
-        self.assert_pack("LAB", "B", 1, (9, 9, 1), (9, 9, 2), (9, 9, 3))
-
-    def test_HSV(self) -> None:
-        self.assert_pack("HSV", "HSV", 3, (1, 2, 3), (4, 5, 6), (7, 8, 9))
-        self.assert_pack("HSV", "H", 1, (1, 9, 9), (2, 9, 9), (3, 9, 9))
-        self.assert_pack("HSV", "S", 1, (9, 1, 9), (9, 2, 9), (9, 3, 9))
-        self.assert_pack("HSV", "V", 1, (9, 9, 1), (9, 9, 2), (9, 9, 3))
-
-    def test_I(self) -> None:
-        self.assert_pack("I", "I;16B", 2, 0x0102, 0x0304)
-        self.assert_pack(
-            "I", "I;32S", b"\x83\x00\x00\x01\x01\x00\x00\x83", 0x01000083, -2097151999
-        )
-
-        if sys.byteorder == "little":
-            self.assert_pack("I", "I", 4, 0x04030201, 0x08070605)
-            self.assert_pack(
+            [(1, 2, 3), (5, 6, 7), (9, 10, 11)],
+        ),
+        ("YCbCr", "Y", 1, [(1, 0, 8, 9), (2, 0, 8, 9), (3, 0, 8, 0)]),
+        ("YCbCr", "Cb", 1, [(6, 1, 8, 9), (6, 2, 8, 9), (6, 3, 8, 9)]),
+        ("YCbCr", "Cr", 1, [(6, 7, 1, 9), (6, 7, 2, 0), (6, 7, 3, 9)]),
+    ]
+
+    # Mode LAB
+    params += [
+        ("LAB", "LAB", 3, [(1, 130, 131), (4, 133, 134), (7, 136, 137)]),
+        ("LAB", "L", 1, [(1, 9, 9), (2, 9, 9), (3, 9, 9)]),
+        ("LAB", "A", 1, [(9, 1, 9), (9, 2, 9), (9, 3, 9)]),
+        ("LAB", "B", 1, [(9, 9, 1), (9, 9, 2), (9, 9, 3)]),
+    ]
+
+    # Mode HSV
+    params += [
+        ("HSV", "HSV", 3, [(1, 2, 3), (4, 5, 6), (7, 8, 9)]),
+        ("HSV", "H", 1, [(1, 9, 9), (2, 9, 9), (3, 9, 9)]),
+        ("HSV", "S", 1, [(9, 1, 9), (9, 2, 9), (9, 3, 9)]),
+        ("HSV", "V", 1, [(9, 9, 1), (9, 9, 2), (9, 9, 3)]),
+    ]
+
+    # Mode I
+    params += [
+        ("I", "I;16B", 2, [0x0102, 0x0304]),
+        ("I", "I;32S", b"\x83\x00\x00\x01\x01\x00\x00\x83", [0x01000083, -2097151999]),
+    ]
+    if is_big_endian():
+        params += [
+            ("I", "I", 4, [0x01020304, 0x05060708]),
+            (
                 "I",
                 "I;32NS",
                 b"\x83\x00\x00\x01\x01\x00\x00\x83",
-                0x01000083,
-                -2097151999,
-            )
-        else:
-            self.assert_pack("I", "I", 4, 0x01020304, 0x05060708)
-            self.assert_pack(
+                [-2097151999, 0x01000083],
+            ),
+        ]
+    else:
+        params += [
+            ("I", "I", 4, [0x04030201, 0x08070605]),
+            (
                 "I",
                 "I;32NS",
                 b"\x83\x00\x00\x01\x01\x00\x00\x83",
-                -2097151999,
-                0x01000083,
-            )
-
-    def test_I16(self) -> None:
-        if sys.byteorder == "little":
-            self.assert_pack("I;16N", "I;16N", 2, 0x0201, 0x0403, 0x0605)
-        else:
-            self.assert_pack("I;16N", "I;16N", 2, 0x0102, 0x0304, 0x0506)
-
-    def test_F_float(self) -> None:
-        self.assert_pack("F", "F;32F", 4, 1.539989614439558e-36, 4.063216068939723e-34)
-
-        if sys.byteorder == "little":
-            self.assert_pack("F", "F", 4, 1.539989614439558e-36, 4.063216068939723e-34)
-            self.assert_pack(
-                "F", "F;32NF", 4, 1.539989614439558e-36, 4.063216068939723e-34
-            )
-        else:
-            self.assert_pack("F", "F", 4, 2.387939260590663e-38, 6.301941157072183e-36)
-            self.assert_pack(
-                "F", "F;32NF", 4, 2.387939260590663e-38, 6.301941157072183e-36
-            )
-
-
-class TestLibUnpack:
-    def assert_unpack(
-        self,
-        mode: str,
-        rawmode: str,
-        data: int | bytes,
-        *pixels: float | tuple[int, ...],
-    ) -> None:
-        """
-        data - either raw bytes with data or just number of bytes in rawmode.
-        """
-        if isinstance(data, int):
-            data_len = data * len(pixels)
-            data = bytes(range(1, data_len + 1))
-
-        im = Image.frombytes(mode, (len(pixels), 1), data, "raw", rawmode, 0, 1)
-
-        for x, pixel in enumerate(pixels):
-            assert pixel == im.getpixel((x, 0))
-
-    def test_1(self) -> None:
-        self.assert_unpack("1", "1", b"\x01", 0, 0, 0, 0, 0, 0, 0, X)
-        self.assert_unpack("1", "1;I", b"\x01", X, X, X, X, X, X, X, 0)
-        self.assert_unpack("1", "1;R", b"\x01", X, 0, 0, 0, 0, 0, 0, 0)
-        self.assert_unpack("1", "1;IR", b"\x01", 0, X, X, X, X, X, X, X)
-
-        self.assert_unpack("1", "1", b"\xaa", X, 0, X, 0, X, 0, X, 0)
-        self.assert_unpack("1", "1;I", b"\xaa", 0, X, 0, X, 0, X, 0, X)
-        self.assert_unpack("1", "1;R", b"\xaa", 0, X, 0, X, 0, X, 0, X)
-        self.assert_unpack("1", "1;IR", b"\xaa", X, 0, X, 0, X, 0, X, 0)
-
-        self.assert_unpack("1", "1;8", b"\x00\x01\x02\xff", 0, X, X, X)
-
-    def test_L(self) -> None:
-        self.assert_unpack("L", "L;2", b"\xe4", 255, 170, 85, 0)
-        self.assert_unpack("L", "L;2I", b"\xe4", 0, 85, 170, 255)
-        self.assert_unpack("L", "L;2R", b"\xe4", 0, 170, 85, 255)
-        self.assert_unpack("L", "L;2IR", b"\xe4", 255, 85, 170, 0)
-
-        self.assert_unpack("L", "L;4", b"\x02\xef", 0, 34, 238, 255)
-        self.assert_unpack("L", "L;4I", b"\x02\xef", 255, 221, 17, 0)
-        self.assert_unpack("L", "L;4R", b"\x02\xef", 68, 0, 255, 119)
-        self.assert_unpack("L", "L;4IR", b"\x02\xef", 187, 255, 0, 136)
-
-        self.assert_unpack("L", "L", 1, 1, 2, 3, 4)
-        self.assert_unpack("L", "L;I", 1, 254, 253, 252, 251)
-        self.assert_unpack("L", "L;R", 1, 128, 64, 192, 32)
-        self.assert_unpack("L", "L;16", 2, 2, 4, 6, 8)
-        self.assert_unpack("L", "L;16B", 2, 1, 3, 5, 7)
-        self.assert_unpack("L", "L;16", b"\x00\xc6\x00\xaf", 198, 175)
-        self.assert_unpack("L", "L;16B", b"\xc6\x00\xaf\x00", 198, 175)
-
-    def test_LA(self) -> None:
-        self.assert_unpack("LA", "LA", 2, (1, 2), (3, 4), (5, 6))
-        self.assert_unpack("LA", "LA;L", 2, (1, 4), (2, 5), (3, 6))
-
-    def test_La(self) -> None:
-        self.assert_unpack("La", "La", 2, (1, 2), (3, 4), (5, 6))
-
-    def test_P(self) -> None:
-        self.assert_unpack("P", "P;1", b"\xe4", 1, 1, 1, 0, 0, 1, 0, 0)
-        self.assert_unpack("P", "P;2", b"\xe4", 3, 2, 1, 0)
+                [0x01000083, -2097151999],
+            ),
+        ]
+
+    # Mode I;16
+    if is_big_endian():
+        params += [("I;16N", "I;16N", 2, [0x0102, 0x0304, 0x0506])]
+    else:
+        params += [("I;16N", "I;16N", 2, [0x0201, 0x0403, 0x0605])]
+
+    # Mode F float
+    params += [
+        ("F", "F;32F", 4, [1.539989614439558e-36, 4.063216068939723e-34]),
+    ]
+    if is_big_endian():
+        params += [
+            ("F", "F", 4, [2.387939260590663e-38, 6.301941157072183e-36]),
+            ("F", "F;32NF", 4, [2.387939260590663e-38, 6.301941157072183e-36]),
+        ]
+    else:
+        params += [
+            ("F", "F", 4, [1.539989614439558e-36, 4.063216068939723e-34]),
+            ("F", "F;32NF", 4, [1.539989614439558e-36, 4.063216068939723e-34]),
+        ]
+
+    return params
+
+
+@pytest.mark.parametrize("mode, rawmode, data, pixels", get_pack_parameters())
+def test_pack(
+    mode: str, rawmode: str, data: int | bytes, pixels: list[float | tuple[int, ...]]
+) -> None:
+    """
+    Test packing from {mode} to {rawmode}.
+    data - Either the number of bytes in a pixel of the rawmode, or a byte string.
+           If a number is given, bytes will be generated starting at 1.
+           The byte string will be compared against the pack result.
+    pixels - The pixels to populate the starting image with.
+    """
+    im = Image.new(mode, (len(pixels), 1))
+    for x, pixel in enumerate(pixels):
+        im.putpixel((x, 0), pixel)
+
+    if isinstance(data, int):
+        data_len = data * len(pixels)
+        data = bytes(range(1, data_len + 1))
+
+    assert data == im.tobytes("raw", rawmode)
+
+
+def get_unpack_parameters() -> (
+    list[str, str, int | bytes, list[float | tuple[int, ...]]]
+):
+    params = []
+
+    # Mode 1
+    params += [
+        ("1", "1", b"\x01", [0, 0, 0, 0, 0, 0, 0, X]),
+        ("1", "1;I", b"\x01", [X, X, X, X, X, X, X, 0]),
+        ("1", "1;R", b"\x01", [X, 0, 0, 0, 0, 0, 0, 0]),
+        ("1", "1;IR", b"\x01", [0, X, X, X, X, X, X, X]),
+        ("1", "1", b"\xaa", [X, 0, X, 0, X, 0, X, 0]),
+        ("1", "1;I", b"\xaa", [0, X, 0, X, 0, X, 0, X]),
+        ("1", "1;R", b"\xaa", [0, X, 0, X, 0, X, 0, X]),
+        ("1", "1;IR", b"\xaa", [X, 0, X, 0, X, 0, X, 0]),
+        ("1", "1;8", b"\x00\x01\x02\xff", [0, X, X, X]),
+    ]
+
+    # Mode L
+    params += [
+        ("L", "L;2", b"\xe4", [255, 170, 85, 0]),
+        ("L", "L;2I", b"\xe4", [0, 85, 170, 255]),
+        ("L", "L;2R", b"\xe4", [0, 170, 85, 255]),
+        ("L", "L;2IR", b"\xe4", [255, 85, 170, 0]),
+        ("L", "L;4", b"\x02\xef", [0, 34, 238, 255]),
+        ("L", "L;4I", b"\x02\xef", [255, 221, 17, 0]),
+        ("L", "L;4R", b"\x02\xef", [68, 0, 255, 119]),
+        ("L", "L;4IR", b"\x02\xef", [187, 255, 0, 136]),
+        ("L", "L", 1, [1, 2, 3, 4]),
+        ("L", "L;I", 1, [254, 253, 252, 251]),
+        ("L", "L;R", 1, [128, 64, 192, 32]),
+        ("L", "L;16", 2, [2, 4, 6, 8]),
+        ("L", "L;16B", 2, [1, 3, 5, 7]),
+        ("L", "L;16", b"\x00\xc6\x00\xaf", [198, 175]),
+        ("L", "L;16B", b"\xc6\x00\xaf\x00", [198, 175]),
+    ]
+
+    # Mode LA
+    params += [
+        ("LA", "LA", 2, [(1, 2), (3, 4), (5, 6)]),
+        ("LA", "LA;L", 2, [(1, 4), (2, 5), (3, 6)]),
+    ]
+
+    # Mode La
+    params += [
+        ("La", "La", 2, [(1, 2), (3, 4), (5, 6)]),
+    ]
+
+    # Mode P
+    params += [
+        ("P", "P;1", b"\xe4", [1, 1, 1, 0, 0, 1, 0, 0]),
+        ("P", "P;2", b"\xe4", [3, 2, 1, 0]),
         # erroneous?
-        # self.assert_unpack("P", "P;2L", b'\xe4', 1, 1, 1, 0)
-        self.assert_unpack("P", "P;4", b"\x02\xef", 0, 2, 14, 15)
+        # ("P", "P;2L", b"\xe4", [1, 1, 1, 0]),
+        ("P", "P;4", b"\x02\xef", [0, 2, 14, 15]),
         # erroneous?
-        # self.assert_unpack("P", "P;4L", b'\x02\xef', 2, 10, 10, 0)
-        self.assert_unpack("P", "P", 1, 1, 2, 3, 4)
-        self.assert_unpack("P", "P;R", 1, 128, 64, 192, 32)
-
-    def test_PA(self) -> None:
-        self.assert_unpack("PA", "PA", 2, (1, 2), (3, 4), (5, 6))
-        self.assert_unpack("PA", "PA;L", 2, (1, 4), (2, 5), (3, 6))
-
-    def test_RGB(self) -> None:
-        self.assert_unpack("RGB", "RGB", 3, (1, 2, 3), (4, 5, 6), (7, 8, 9))
-        self.assert_unpack("RGB", "RGB;L", 3, (1, 4, 7), (2, 5, 8), (3, 6, 9))
-        self.assert_unpack("RGB", "RGB;R", 3, (128, 64, 192), (32, 160, 96))
-        self.assert_unpack("RGB", "RGB;16L", 6, (2, 4, 6), (8, 10, 12))
-        self.assert_unpack("RGB", "RGB;16B", 6, (1, 3, 5), (7, 9, 11))
-        self.assert_unpack("RGB", "BGR", 3, (3, 2, 1), (6, 5, 4), (9, 8, 7))
-        self.assert_unpack("RGB", "RGB;15", 2, (8, 131, 0), (24, 0, 8))
-        self.assert_unpack("RGB", "BGR;15", 2, (0, 131, 8), (8, 0, 24))
-        self.assert_unpack("RGB", "RGB;16", 2, (8, 64, 0), (24, 129, 0))
-        self.assert_unpack("RGB", "BGR;16", 2, (0, 64, 8), (0, 129, 24))
-        self.assert_unpack("RGB", "RGB;4B", 2, (17, 0, 34), (51, 0, 68))
-        self.assert_unpack("RGB", "RGBX", 4, (1, 2, 3), (5, 6, 7), (9, 10, 11))
-        self.assert_unpack("RGB", "RGBX;L", 4, (1, 4, 7), (2, 5, 8), (3, 6, 9))
-        self.assert_unpack("RGB", "BGRX", 4, (3, 2, 1), (7, 6, 5), (11, 10, 9))
-        self.assert_unpack("RGB", "XRGB", 4, (2, 3, 4), (6, 7, 8), (10, 11, 12))
-        self.assert_unpack("RGB", "XBGR", 4, (4, 3, 2), (8, 7, 6), (12, 11, 10))
-        self.assert_unpack(
+        # ("P", "P;4L", b"\x02\xef", [2, 10, 10, 0]),
+        ("P", "P", 1, [1, 2, 3, 4]),
+        ("P", "P;R", 1, [128, 64, 192, 32]),
+    ]
+
+    # Mode PA
+    params += [
+        ("PA", "PA", 2, [(1, 2), (3, 4), (5, 6)]),
+        ("PA", "PA;L", 2, [(1, 4), (2, 5), (3, 6)]),
+    ]
+
+    # Mode RGB
+    params += [
+        ("RGB", "RGB", 3, [(1, 2, 3), (4, 5, 6), (7, 8, 9)]),
+        ("RGB", "RGB;L", 3, [(1, 4, 7), (2, 5, 8), (3, 6, 9)]),
+        ("RGB", "RGB;R", 3, [(128, 64, 192), (32, 160, 96)]),
+        ("RGB", "RGB;16L", 6, [(2, 4, 6), (8, 10, 12)]),
+        ("RGB", "RGB;16B", 6, [(1, 3, 5), (7, 9, 11)]),
+        ("RGB", "BGR", 3, [(3, 2, 1), (6, 5, 4), (9, 8, 7)]),
+        ("RGB", "RGB;15", 2, [(8, 131, 0), (24, 0, 8)]),
+        ("RGB", "BGR;15", 2, [(0, 131, 8), (8, 0, 24)]),
+        ("RGB", "RGB;16", 2, [(8, 64, 0), (24, 129, 0)]),
+        ("RGB", "BGR;16", 2, [(0, 64, 8), (0, 129, 24)]),
+        ("RGB", "RGB;4B", 2, [(17, 0, 34), (51, 0, 68)]),
+        ("RGB", "RGBX", 4, [(1, 2, 3), (5, 6, 7), (9, 10, 11)]),
+        ("RGB", "RGBX;L", 4, [(1, 4, 7), (2, 5, 8), (3, 6, 9)]),
+        ("RGB", "BGRX", 4, [(3, 2, 1), (7, 6, 5), (11, 10, 9)]),
+        ("RGB", "XRGB", 4, [(2, 3, 4), (6, 7, 8), (10, 11, 12)]),
+        ("RGB", "XBGR", 4, [(4, 3, 2), (8, 7, 6), (12, 11, 10)]),
+        (
             "RGB",
             "YCC;P",
             b"D]\x9c\x82\x1a\x91\xfaOC\xe7J\x12",  # random data
-            (127, 102, 0),
-            (192, 227, 0),
-            (213, 255, 170),
-            (98, 255, 133),
-        )
-        self.assert_unpack("RGB", "R", 1, (1, 0, 0), (2, 0, 0), (3, 0, 0))
-        self.assert_unpack("RGB", "G", 1, (0, 1, 0), (0, 2, 0), (0, 3, 0))
-        self.assert_unpack("RGB", "B", 1, (0, 0, 1), (0, 0, 2), (0, 0, 3))
-
-        self.assert_unpack("RGB", "R;16B", 2, (1, 0, 0), (3, 0, 0), (5, 0, 0))
-        self.assert_unpack("RGB", "G;16B", 2, (0, 1, 0), (0, 3, 0), (0, 5, 0))
-        self.assert_unpack("RGB", "B;16B", 2, (0, 0, 1), (0, 0, 3), (0, 0, 5))
-
-        self.assert_unpack("RGB", "R;16L", 2, (2, 0, 0), (4, 0, 0), (6, 0, 0))
-        self.assert_unpack("RGB", "G;16L", 2, (0, 2, 0), (0, 4, 0), (0, 6, 0))
-        self.assert_unpack("RGB", "B;16L", 2, (0, 0, 2), (0, 0, 4), (0, 0, 6))
-
-        if sys.byteorder == "little":
-            self.assert_unpack("RGB", "R;16N", 2, (2, 0, 0), (4, 0, 0), (6, 0, 0))
-            self.assert_unpack("RGB", "G;16N", 2, (0, 2, 0), (0, 4, 0), (0, 6, 0))
-            self.assert_unpack("RGB", "B;16N", 2, (0, 0, 2), (0, 0, 4), (0, 0, 6))
-        else:
-            self.assert_unpack("RGB", "R;16N", 2, (1, 0, 0), (3, 0, 0), (5, 0, 0))
-            self.assert_unpack("RGB", "G;16N", 2, (0, 1, 0), (0, 3, 0), (0, 5, 0))
-            self.assert_unpack("RGB", "B;16N", 2, (0, 0, 1), (0, 0, 3), (0, 0, 5))
-
-        self.assert_unpack(
-            "RGB", "CMYK", 4, (250, 249, 248), (242, 241, 240), (234, 233, 233)
-        )
-
-    def test_BGR(self) -> None:
-        with pytest.warns(DeprecationWarning):
-            self.assert_unpack(
-                "BGR;15", "BGR;15", 3, (8, 131, 0), (24, 0, 8), (41, 131, 8)
-            )
-            self.assert_unpack(
-                "BGR;16", "BGR;16", 3, (8, 64, 0), (24, 129, 0), (41, 194, 0)
-            )
-            self.assert_unpack("BGR;24", "BGR;24", 3, (1, 2, 3), (4, 5, 6), (7, 8, 9))
-
-    def test_RGBA(self) -> None:
-        self.assert_unpack("RGBA", "LA", 2, (1, 1, 1, 2), (3, 3, 3, 4), (5, 5, 5, 6))
-        self.assert_unpack(
-            "RGBA", "LA;16B", 4, (1, 1, 1, 3), (5, 5, 5, 7), (9, 9, 9, 11)
-        )
-        self.assert_unpack(
-            "RGBA", "RGBA", 4, (1, 2, 3, 4), (5, 6, 7, 8), (9, 10, 11, 12)
-        )
-        self.assert_unpack(
-            "RGBA", "RGBAX", 5, (1, 2, 3, 4), (6, 7, 8, 9), (11, 12, 13, 14)
-        )
-        self.assert_unpack(
-            "RGBA", "RGBAXX", 6, (1, 2, 3, 4), (7, 8, 9, 10), (13, 14, 15, 16)
-        )
-        self.assert_unpack(
+            [(127, 102, 0), (192, 227, 0), (213, 255, 170), (98, 255, 133)],
+        ),
+        ("RGB", "R", 1, [(1, 0, 0), (2, 0, 0), (3, 0, 0)]),
+        ("RGB", "G", 1, [(0, 1, 0), (0, 2, 0), (0, 3, 0)]),
+        ("RGB", "B", 1, [(0, 0, 1), (0, 0, 2), (0, 0, 3)]),
+        ("RGB", "R;16B", 2, [(1, 0, 0), (3, 0, 0), (5, 0, 0)]),
+        ("RGB", "G;16B", 2, [(0, 1, 0), (0, 3, 0), (0, 5, 0)]),
+        ("RGB", "B;16B", 2, [(0, 0, 1), (0, 0, 3), (0, 0, 5)]),
+        ("RGB", "R;16L", 2, [(2, 0, 0), (4, 0, 0), (6, 0, 0)]),
+        ("RGB", "G;16L", 2, [(0, 2, 0), (0, 4, 0), (0, 6, 0)]),
+        ("RGB", "B;16L", 2, [(0, 0, 2), (0, 0, 4), (0, 0, 6)]),
+    ]
+
+    if is_big_endian():
+        params += [
+            ("RGB", "R;16N", 2, [(1, 0, 0), (3, 0, 0), (5, 0, 0)]),
+            ("RGB", "G;16N", 2, [(0, 1, 0), (0, 3, 0), (0, 5, 0)]),
+            ("RGB", "B;16N", 2, [(0, 0, 1), (0, 0, 3), (0, 0, 5)]),
+        ]
+    else:
+        params += [
+            ("RGB", "R;16N", 2, [(2, 0, 0), (4, 0, 0), (6, 0, 0)]),
+            ("RGB", "G;16N", 2, [(0, 2, 0), (0, 4, 0), (0, 6, 0)]),
+            ("RGB", "B;16N", 2, [(0, 0, 2), (0, 0, 4), (0, 0, 6)]),
+        ]
+
+    params += [
+        ("RGB", "CMYK", 4, [(250, 249, 248), (242, 241, 240), (234, 233, 233)]),
+    ]
+
+    # Mode RGBA
+    params += [
+        ("RGBA", "LA", 2, [(1, 1, 1, 2), (3, 3, 3, 4), (5, 5, 5, 6)]),
+        ("RGBA", "LA;16B", 4, [(1, 1, 1, 3), (5, 5, 5, 7), (9, 9, 9, 11)]),
+        ("RGBA", "RGBA", 4, [(1, 2, 3, 4), (5, 6, 7, 8), (9, 10, 11, 12)]),
+        ("RGBA", "RGBAX", 5, [(1, 2, 3, 4), (6, 7, 8, 9), (11, 12, 13, 14)]),
+        ("RGBA", "RGBAXX", 6, [(1, 2, 3, 4), (7, 8, 9, 10), (13, 14, 15, 16)]),
+        (
             "RGBA",
             "RGBa",
             4,
-            (63, 127, 191, 4),
-            (159, 191, 223, 8),
-            (191, 212, 233, 12),
-        )
-        self.assert_unpack(
+            [
+                (63, 127, 191, 4),
+                (159, 191, 223, 8),
+                (191, 212, 233, 12),
+            ],
+        ),
+        (
             "RGBA",
             "RGBa",
             b"\x01\x02\x03\x00\x10\x20\x30\x7f\x10\x20\x30\xff",
-            (0, 0, 0, 0),
-            (32, 64, 96, 127),
-            (16, 32, 48, 255),
-        )
-        self.assert_unpack(
+            [
+                (0, 0, 0, 0),
+                (32, 64, 96, 127),
+                (16, 32, 48, 255),
+            ],
+        ),
+        (
             "RGBA",
             "RGBaX",
             b"\x01\x02\x03\x00-\x10\x20\x30\x7f-\x10\x20\x30\xff-",
-            (0, 0, 0, 0),
-            (32, 64, 96, 127),
-            (16, 32, 48, 255),
-        )
-        self.assert_unpack(
+            [
+                (0, 0, 0, 0),
+                (32, 64, 96, 127),
+                (16, 32, 48, 255),
+            ],
+        ),
+        (
             "RGBA",
             "RGBaXX",
             b"\x01\x02\x03\x00==\x10\x20\x30\x7f!!\x10\x20\x30\xff??",
-            (0, 0, 0, 0),
-            (32, 64, 96, 127),
-            (16, 32, 48, 255),
-        )
-        self.assert_unpack(
+            [
+                (0, 0, 0, 0),
+                (32, 64, 96, 127),
+                (16, 32, 48, 255),
+            ],
+        ),
+        (
             "RGBA",
             "RGBa;16L",
             8,
-            (63, 127, 191, 8),
-            (159, 191, 223, 16),
-            (191, 212, 233, 24),
-        )
-        self.assert_unpack(
+            [
+                (63, 127, 191, 8),
+                (159, 191, 223, 16),
+                (191, 212, 233, 24),
+            ],
+        ),
+        (
             "RGBA",
             "RGBa;16L",
             b"\x88\x01\x88\x02\x88\x03\x88\x00\x88\x10\x88\x20\x88\x30\x88\xff",
-            (0, 0, 0, 0),
-            (16, 32, 48, 255),
-        )
-        self.assert_unpack(
+            [
+                (0, 0, 0, 0),
+                (16, 32, 48, 255),
+            ],
+        ),
+        (
             "RGBA",
             "RGBa;16B",
             8,
-            (36, 109, 182, 7),
-            (153, 187, 221, 15),
-            (188, 210, 232, 23),
-        )
-        self.assert_unpack(
+            [
+                (36, 109, 182, 7),
+                (153, 187, 221, 15),
+                (188, 210, 232, 23),
+            ],
+        ),
+        (
             "RGBA",
             "RGBa;16B",
             b"\x01\x88\x02\x88\x03\x88\x00\x88\x10\x88\x20\x88\x30\x88\xff\x88",
-            (0, 0, 0, 0),
-            (16, 32, 48, 255),
-        )
-        self.assert_unpack(
+            [
+                (0, 0, 0, 0),
+                (16, 32, 48, 255),
+            ],
+        ),
+        (
             "RGBA",
             "BGRa",
             4,
-            (191, 127, 63, 4),
-            (223, 191, 159, 8),
-            (233, 212, 191, 12),
-        )
-        self.assert_unpack(
+            [
+                (191, 127, 63, 4),
+                (223, 191, 159, 8),
+                (233, 212, 191, 12),
+            ],
+        ),
+        (
             "RGBA",
             "BGRa",
             b"\x01\x02\x03\x00\x10\x20\x30\xff",
-            (0, 0, 0, 0),
-            (48, 32, 16, 255),
-        )
-        self.assert_unpack(
+            [
+                (0, 0, 0, 0),
+                (48, 32, 16, 255),
+            ],
+        ),
+        (
             "RGBA",
             "RGBA;I",
             4,
-            (254, 253, 252, 4),
-            (250, 249, 248, 8),
-            (246, 245, 244, 12),
-        )
-        self.assert_unpack(
-            "RGBA", "RGBA;L", 4, (1, 4, 7, 10), (2, 5, 8, 11), (3, 6, 9, 12)
-        )
-        self.assert_unpack("RGBA", "RGBA;15", 2, (8, 131, 0, 0), (24, 0, 8, 0))
-        self.assert_unpack("RGBA", "BGRA;15", 2, (0, 131, 8, 0), (8, 0, 24, 0))
-        self.assert_unpack("RGBA", "RGBA;4B", 2, (17, 0, 34, 0), (51, 0, 68, 0))
-        self.assert_unpack("RGBA", "RGBA;16L", 8, (2, 4, 6, 8), (10, 12, 14, 16))
-        self.assert_unpack("RGBA", "RGBA;16B", 8, (1, 3, 5, 7), (9, 11, 13, 15))
-        self.assert_unpack("RGBA", "BGRA;16L", 8, (6, 4, 2, 8), (14, 12, 10, 16))
-        self.assert_unpack("RGBA", "BGRA;16B", 8, (5, 3, 1, 7), (13, 11, 9, 15))
-        self.assert_unpack(
-            "RGBA", "BGRA", 4, (3, 2, 1, 4), (7, 6, 5, 8), (11, 10, 9, 12)
-        )
-        self.assert_unpack(
-            "RGBA", "ARGB", 4, (2, 3, 4, 1), (6, 7, 8, 5), (10, 11, 12, 9)
-        )
-        self.assert_unpack(
-            "RGBA", "ABGR", 4, (4, 3, 2, 1), (8, 7, 6, 5), (12, 11, 10, 9)
-        )
-        self.assert_unpack(
+            [
+                (254, 253, 252, 4),
+                (250, 249, 248, 8),
+                (246, 245, 244, 12),
+            ],
+        ),
+        ("RGBA", "RGBA;L", 4, [(1, 4, 7, 10), (2, 5, 8, 11), (3, 6, 9, 12)]),
+        ("RGBA", "RGBA;15", 2, [(8, 131, 0, 0), (24, 0, 8, 0)]),
+        ("RGBA", "BGRA;15", 2, [(0, 131, 8, 0), (8, 0, 24, 0)]),
+        ("RGBA", "RGBA;4B", 2, [(17, 0, 34, 0), (51, 0, 68, 0)]),
+        ("RGBA", "RGBA;16L", 8, [(2, 4, 6, 8), (10, 12, 14, 16)]),
+        ("RGBA", "RGBA;16B", 8, [(1, 3, 5, 7), (9, 11, 13, 15)]),
+        ("RGBA", "BGRA;16L", 8, [(6, 4, 2, 8), (14, 12, 10, 16)]),
+        ("RGBA", "BGRA;16B", 8, [(5, 3, 1, 7), (13, 11, 9, 15)]),
+        ("RGBA", "BGRA", 4, [(3, 2, 1, 4), (7, 6, 5, 8), (11, 10, 9, 12)]),
+        ("RGBA", "ARGB", 4, [(2, 3, 4, 1), (6, 7, 8, 5), (10, 11, 12, 9)]),
+        ("RGBA", "ABGR", 4, [(4, 3, 2, 1), (8, 7, 6, 5), (12, 11, 10, 9)]),
+        (
             "RGBA",
             "YCCA;P",
             b"]bE\x04\xdd\xbej\xed57T\xce\xac\xce:\x11",  # random data
-            (0, 161, 0, 4),
-            (255, 255, 255, 237),
-            (27, 158, 0, 206),
-            (0, 118, 0, 17),
-        )
-        self.assert_unpack("RGBA", "R", 1, (1, 0, 0, 0), (2, 0, 0, 0), (3, 0, 0, 0))
-        self.assert_unpack("RGBA", "G", 1, (0, 1, 0, 0), (0, 2, 0, 0), (0, 3, 0, 0))
-        self.assert_unpack("RGBA", "B", 1, (0, 0, 1, 0), (0, 0, 2, 0), (0, 0, 3, 0))
-        self.assert_unpack("RGBA", "A", 1, (0, 0, 0, 1), (0, 0, 0, 2), (0, 0, 0, 3))
-
-        self.assert_unpack("RGBA", "R;16B", 2, (1, 0, 0, 0), (3, 0, 0, 0), (5, 0, 0, 0))
-        self.assert_unpack("RGBA", "G;16B", 2, (0, 1, 0, 0), (0, 3, 0, 0), (0, 5, 0, 0))
-        self.assert_unpack("RGBA", "B;16B", 2, (0, 0, 1, 0), (0, 0, 3, 0), (0, 0, 5, 0))
-        self.assert_unpack("RGBA", "A;16B", 2, (0, 0, 0, 1), (0, 0, 0, 3), (0, 0, 0, 5))
-
-        self.assert_unpack("RGBA", "R;16L", 2, (2, 0, 0, 0), (4, 0, 0, 0), (6, 0, 0, 0))
-        self.assert_unpack("RGBA", "G;16L", 2, (0, 2, 0, 0), (0, 4, 0, 0), (0, 6, 0, 0))
-        self.assert_unpack("RGBA", "B;16L", 2, (0, 0, 2, 0), (0, 0, 4, 0), (0, 0, 6, 0))
-        self.assert_unpack("RGBA", "A;16L", 2, (0, 0, 0, 2), (0, 0, 0, 4), (0, 0, 0, 6))
-
-        if sys.byteorder == "little":
-            self.assert_unpack(
-                "RGBA", "R;16N", 2, (2, 0, 0, 0), (4, 0, 0, 0), (6, 0, 0, 0)
-            )
-            self.assert_unpack(
-                "RGBA", "G;16N", 2, (0, 2, 0, 0), (0, 4, 0, 0), (0, 6, 0, 0)
-            )
-            self.assert_unpack(
-                "RGBA", "B;16N", 2, (0, 0, 2, 0), (0, 0, 4, 0), (0, 0, 6, 0)
-            )
-            self.assert_unpack(
-                "RGBA", "A;16N", 2, (0, 0, 0, 2), (0, 0, 0, 4), (0, 0, 0, 6)
-            )
-        else:
-            self.assert_unpack(
-                "RGBA", "R;16N", 2, (1, 0, 0, 0), (3, 0, 0, 0), (5, 0, 0, 0)
-            )
-            self.assert_unpack(
-                "RGBA", "G;16N", 2, (0, 1, 0, 0), (0, 3, 0, 0), (0, 5, 0, 0)
-            )
-            self.assert_unpack(
-                "RGBA", "B;16N", 2, (0, 0, 1, 0), (0, 0, 3, 0), (0, 0, 5, 0)
-            )
-            self.assert_unpack(
-                "RGBA", "A;16N", 2, (0, 0, 0, 1), (0, 0, 0, 3), (0, 0, 0, 5)
-            )
-
-    def test_RGBa(self) -> None:
-        self.assert_unpack(
-            "RGBa", "RGBa", 4, (1, 2, 3, 4), (5, 6, 7, 8), (9, 10, 11, 12)
-        )
-        self.assert_unpack(
-            "RGBa", "BGRa", 4, (3, 2, 1, 4), (7, 6, 5, 8), (11, 10, 9, 12)
-        )
-        self.assert_unpack(
-            "RGBa", "aRGB", 4, (2, 3, 4, 1), (6, 7, 8, 5), (10, 11, 12, 9)
-        )
-        self.assert_unpack(
-            "RGBa", "aBGR", 4, (4, 3, 2, 1), (8, 7, 6, 5), (12, 11, 10, 9)
-        )
-
-    def test_RGBX(self) -> None:
-        self.assert_unpack("RGBX", "RGB", 3, (1, 2, 3, X), (4, 5, 6, X), (7, 8, 9, X))
-        self.assert_unpack("RGBX", "RGB;L", 3, (1, 4, 7, X), (2, 5, 8, X), (3, 6, 9, X))
-        self.assert_unpack("RGBX", "RGB;16B", 6, (1, 3, 5, X), (7, 9, 11, X))
-        self.assert_unpack("RGBX", "BGR", 3, (3, 2, 1, X), (6, 5, 4, X), (9, 8, 7, X))
-        self.assert_unpack("RGBX", "RGB;15", 2, (8, 131, 0, X), (24, 0, 8, X))
-        self.assert_unpack("RGBX", "BGR;15", 2, (0, 131, 8, X), (8, 0, 24, X))
-        self.assert_unpack("RGBX", "RGB;4B", 2, (17, 0, 34, X), (51, 0, 68, X))
-        self.assert_unpack(
-            "RGBX", "RGBX", 4, (1, 2, 3, 4), (5, 6, 7, 8), (9, 10, 11, 12)
-        )
-        self.assert_unpack(
-            "RGBX", "RGBXX", 5, (1, 2, 3, 4), (6, 7, 8, 9), (11, 12, 13, 14)
-        )
-        self.assert_unpack(
-            "RGBX", "RGBXXX", 6, (1, 2, 3, 4), (7, 8, 9, 10), (13, 14, 15, 16)
-        )
-        self.assert_unpack(
-            "RGBX", "RGBX;L", 4, (1, 4, 7, 10), (2, 5, 8, 11), (3, 6, 9, 12)
-        )
-        self.assert_unpack("RGBX", "RGBX;16L", 8, (2, 4, 6, 8), (10, 12, 14, 16))
-        self.assert_unpack("RGBX", "RGBX;16B", 8, (1, 3, 5, 7), (9, 11, 13, 15))
-        self.assert_unpack(
-            "RGBX", "BGRX", 4, (3, 2, 1, X), (7, 6, 5, X), (11, 10, 9, X)
-        )
-        self.assert_unpack(
-            "RGBX", "XRGB", 4, (2, 3, 4, X), (6, 7, 8, X), (10, 11, 12, X)
-        )
-        self.assert_unpack(
-            "RGBX", "XBGR", 4, (4, 3, 2, X), (8, 7, 6, X), (12, 11, 10, X)
-        )
-        self.assert_unpack(
+            [
+                (0, 161, 0, 4),
+                (255, 255, 255, 237),
+                (27, 158, 0, 206),
+                (0, 118, 0, 17),
+            ],
+        ),
+        ("RGBA", "R", 1, [(1, 0, 0, 0), (2, 0, 0, 0), (3, 0, 0, 0)]),
+        ("RGBA", "G", 1, [(0, 1, 0, 0), (0, 2, 0, 0), (0, 3, 0, 0)]),
+        ("RGBA", "B", 1, [(0, 0, 1, 0), (0, 0, 2, 0), (0, 0, 3, 0)]),
+        ("RGBA", "A", 1, [(0, 0, 0, 1), (0, 0, 0, 2), (0, 0, 0, 3)]),
+        ("RGBA", "R;16B", 2, [(1, 0, 0, 0), (3, 0, 0, 0), (5, 0, 0, 0)]),
+        ("RGBA", "G;16B", 2, [(0, 1, 0, 0), (0, 3, 0, 0), (0, 5, 0, 0)]),
+        ("RGBA", "B;16B", 2, [(0, 0, 1, 0), (0, 0, 3, 0), (0, 0, 5, 0)]),
+        ("RGBA", "A;16B", 2, [(0, 0, 0, 1), (0, 0, 0, 3), (0, 0, 0, 5)]),
+        ("RGBA", "R;16L", 2, [(2, 0, 0, 0), (4, 0, 0, 0), (6, 0, 0, 0)]),
+        ("RGBA", "G;16L", 2, [(0, 2, 0, 0), (0, 4, 0, 0), (0, 6, 0, 0)]),
+        ("RGBA", "B;16L", 2, [(0, 0, 2, 0), (0, 0, 4, 0), (0, 0, 6, 0)]),
+        ("RGBA", "A;16L", 2, [(0, 0, 0, 2), (0, 0, 0, 4), (0, 0, 0, 6)]),
+    ]
+
+    if is_big_endian():
+        params += [
+            ("RGBA", "R;16N", 2, [(1, 0, 0, 0), (3, 0, 0, 0), (5, 0, 0, 0)]),
+            ("RGBA", "G;16N", 2, [(0, 1, 0, 0), (0, 3, 0, 0), (0, 5, 0, 0)]),
+            ("RGBA", "B;16N", 2, [(0, 0, 1, 0), (0, 0, 3, 0), (0, 0, 5, 0)]),
+            ("RGBA", "A;16N", 2, [(0, 0, 0, 1), (0, 0, 0, 3), (0, 0, 0, 5)]),
+        ]
+    else:
+        params += [
+            ("RGBA", "R;16N", 2, [(2, 0, 0, 0), (4, 0, 0, 0), (6, 0, 0, 0)]),
+            ("RGBA", "G;16N", 2, [(0, 2, 0, 0), (0, 4, 0, 0), (0, 6, 0, 0)]),
+            ("RGBA", "B;16N", 2, [(0, 0, 2, 0), (0, 0, 4, 0), (0, 0, 6, 0)]),
+            ("RGBA", "A;16N", 2, [(0, 0, 0, 2), (0, 0, 0, 4), (0, 0, 0, 6)]),
+        ]
+
+    # Mode RGBa
+    params += [
+        ("RGBa", "RGBa", 4, [(1, 2, 3, 4), (5, 6, 7, 8), (9, 10, 11, 12)]),
+        ("RGBa", "BGRa", 4, [(3, 2, 1, 4), (7, 6, 5, 8), (11, 10, 9, 12)]),
+        ("RGBa", "aRGB", 4, [(2, 3, 4, 1), (6, 7, 8, 5), (10, 11, 12, 9)]),
+        ("RGBa", "aBGR", 4, [(4, 3, 2, 1), (8, 7, 6, 5), (12, 11, 10, 9)]),
+    ]
+
+    # Mode RGBX
+    params += [
+        ("RGBX", "RGB", 3, [(1, 2, 3, X), (4, 5, 6, X), (7, 8, 9, X)]),
+        ("RGBX", "RGB;L", 3, [(1, 4, 7, X), (2, 5, 8, X), (3, 6, 9, X)]),
+        ("RGBX", "RGB;16B", 6, [(1, 3, 5, X), (7, 9, 11, X)]),
+        ("RGBX", "BGR", 3, [(3, 2, 1, X), (6, 5, 4, X), (9, 8, 7, X)]),
+        ("RGBX", "RGB;15", 2, [(8, 131, 0, X), (24, 0, 8, X)]),
+        ("RGBX", "BGR;15", 2, [(0, 131, 8, X), (8, 0, 24, X)]),
+        ("RGBX", "RGB;4B", 2, [(17, 0, 34, X), (51, 0, 68, X)]),
+        ("RGBX", "RGBX", 4, [(1, 2, 3, 4), (5, 6, 7, 8), (9, 10, 11, 12)]),
+        ("RGBX", "RGBXX", 5, [(1, 2, 3, 4), (6, 7, 8, 9), (11, 12, 13, 14)]),
+        ("RGBX", "RGBXXX", 6, [(1, 2, 3, 4), (7, 8, 9, 10), (13, 14, 15, 16)]),
+        ("RGBX", "RGBX;L", 4, [(1, 4, 7, 10), (2, 5, 8, 11), (3, 6, 9, 12)]),
+        ("RGBX", "RGBX;16L", 8, [(2, 4, 6, 8), (10, 12, 14, 16)]),
+        ("RGBX", "RGBX;16B", 8, [(1, 3, 5, 7), (9, 11, 13, 15)]),
+        ("RGBX", "BGRX", 4, [(3, 2, 1, X), (7, 6, 5, X), (11, 10, 9, X)]),
+        ("RGBX", "XRGB", 4, [(2, 3, 4, X), (6, 7, 8, X), (10, 11, 12, X)]),
+        ("RGBX", "XBGR", 4, [(4, 3, 2, X), (8, 7, 6, X), (12, 11, 10, X)]),
+        (
             "RGBX",
             "YCC;P",
             b"D]\x9c\x82\x1a\x91\xfaOC\xe7J\x12",  # random data
-            (127, 102, 0, X),
-            (192, 227, 0, X),
-            (213, 255, 170, X),
-            (98, 255, 133, X),
-        )
-        self.assert_unpack("RGBX", "R", 1, (1, 0, 0, 0), (2, 0, 0, 0), (3, 0, 0, 0))
-        self.assert_unpack("RGBX", "G", 1, (0, 1, 0, 0), (0, 2, 0, 0), (0, 3, 0, 0))
-        self.assert_unpack("RGBX", "B", 1, (0, 0, 1, 0), (0, 0, 2, 0), (0, 0, 3, 0))
-        self.assert_unpack("RGBX", "X", 1, (0, 0, 0, 1), (0, 0, 0, 2), (0, 0, 0, 3))
-
-    def test_CMYK(self) -> None:
-        self.assert_unpack(
-            "CMYK", "CMYK", 4, (1, 2, 3, 4), (5, 6, 7, 8), (9, 10, 11, 12)
-        )
-        self.assert_unpack(
-            "CMYK", "CMYKX", 5, (1, 2, 3, 4), (6, 7, 8, 9), (11, 12, 13, 14)
-        )
-        self.assert_unpack(
-            "CMYK", "CMYKXX", 6, (1, 2, 3, 4), (7, 8, 9, 10), (13, 14, 15, 16)
-        )
-        self.assert_unpack(
+            [
+                (127, 102, 0, X),
+                (192, 227, 0, X),
+                (213, 255, 170, X),
+                (98, 255, 133, X),
+            ],
+        ),
+        ("RGBX", "R", 1, [(1, 0, 0, 0), (2, 0, 0, 0), (3, 0, 0, 0)]),
+        ("RGBX", "G", 1, [(0, 1, 0, 0), (0, 2, 0, 0), (0, 3, 0, 0)]),
+        ("RGBX", "B", 1, [(0, 0, 1, 0), (0, 0, 2, 0), (0, 0, 3, 0)]),
+        ("RGBX", "X", 1, [(0, 0, 0, 1), (0, 0, 0, 2), (0, 0, 0, 3)]),
+    ]
+
+    # Mode CMYK
+    params += [
+        ("CMYK", "CMYK", 4, [(1, 2, 3, 4), (5, 6, 7, 8), (9, 10, 11, 12)]),
+        ("CMYK", "CMYKX", 5, [(1, 2, 3, 4), (6, 7, 8, 9), (11, 12, 13, 14)]),
+        ("CMYK", "CMYKXX", 6, [(1, 2, 3, 4), (7, 8, 9, 10), (13, 14, 15, 16)]),
+        (
             "CMYK",
             "CMYK;I",
             4,
-            (254, 253, 252, 251),
-            (250, 249, 248, 247),
-            (246, 245, 244, 243),
-        )
-        self.assert_unpack(
-            "CMYK", "CMYK;L", 4, (1, 4, 7, 10), (2, 5, 8, 11), (3, 6, 9, 12)
-        )
-        self.assert_unpack("CMYK", "C", 1, (1, 0, 0, 0), (2, 0, 0, 0), (3, 0, 0, 0))
-        self.assert_unpack("CMYK", "M", 1, (0, 1, 0, 0), (0, 2, 0, 0), (0, 3, 0, 0))
-        self.assert_unpack("CMYK", "Y", 1, (0, 0, 1, 0), (0, 0, 2, 0), (0, 0, 3, 0))
-        self.assert_unpack("CMYK", "K", 1, (0, 0, 0, 1), (0, 0, 0, 2), (0, 0, 0, 3))
-        self.assert_unpack(
-            "CMYK", "C;I", 1, (254, 0, 0, 0), (253, 0, 0, 0), (252, 0, 0, 0)
-        )
-        self.assert_unpack(
-            "CMYK", "M;I", 1, (0, 254, 0, 0), (0, 253, 0, 0), (0, 252, 0, 0)
-        )
-        self.assert_unpack(
-            "CMYK", "Y;I", 1, (0, 0, 254, 0), (0, 0, 253, 0), (0, 0, 252, 0)
-        )
-        self.assert_unpack(
-            "CMYK", "K;I", 1, (0, 0, 0, 254), (0, 0, 0, 253), (0, 0, 0, 252)
-        )
-
-    def test_YCbCr(self) -> None:
-        self.assert_unpack("YCbCr", "YCbCr", 3, (1, 2, 3), (4, 5, 6), (7, 8, 9))
-        self.assert_unpack("YCbCr", "YCbCr;L", 3, (1, 4, 7), (2, 5, 8), (3, 6, 9))
-        self.assert_unpack("YCbCr", "YCbCrK", 4, (1, 2, 3), (5, 6, 7), (9, 10, 11))
-        self.assert_unpack("YCbCr", "YCbCrX", 4, (1, 2, 3), (5, 6, 7), (9, 10, 11))
-
-    def test_LAB(self) -> None:
-        self.assert_unpack("LAB", "LAB", 3, (1, 130, 131), (4, 133, 134), (7, 136, 137))
-        self.assert_unpack("LAB", "L", 1, (1, 0, 0), (2, 0, 0), (3, 0, 0))
-        self.assert_unpack("LAB", "A", 1, (0, 1, 0), (0, 2, 0), (0, 3, 0))
-        self.assert_unpack("LAB", "B", 1, (0, 0, 1), (0, 0, 2), (0, 0, 3))
-
-    def test_HSV(self) -> None:
-        self.assert_unpack("HSV", "HSV", 3, (1, 2, 3), (4, 5, 6), (7, 8, 9))
-        self.assert_unpack("HSV", "H", 1, (1, 0, 0), (2, 0, 0), (3, 0, 0))
-        self.assert_unpack("HSV", "S", 1, (0, 1, 0), (0, 2, 0), (0, 3, 0))
-        self.assert_unpack("HSV", "V", 1, (0, 0, 1), (0, 0, 2), (0, 0, 3))
-
-    def test_I(self) -> None:
-        self.assert_unpack("I", "I;8", 1, 0x01, 0x02, 0x03, 0x04)
-        self.assert_unpack("I", "I;8S", b"\x01\x83", 1, -125)
-        self.assert_unpack("I", "I;16", 2, 0x0201, 0x0403)
-        self.assert_unpack("I", "I;16S", b"\x83\x01\x01\x83", 0x0183, -31999)
-        self.assert_unpack("I", "I;16B", 2, 0x0102, 0x0304)
-        self.assert_unpack("I", "I;16BS", b"\x83\x01\x01\x83", -31999, 0x0183)
-        self.assert_unpack("I", "I;32", 4, 0x04030201, 0x08070605)
-        self.assert_unpack(
-            "I", "I;32S", b"\x83\x00\x00\x01\x01\x00\x00\x83", 0x01000083, -2097151999
-        )
-        self.assert_unpack("I", "I;32B", 4, 0x01020304, 0x05060708)
-        self.assert_unpack(
-            "I", "I;32BS", b"\x83\x00\x00\x01\x01\x00\x00\x83", -2097151999, 0x01000083
-        )
-
-        if sys.byteorder == "little":
-            self.assert_unpack("I", "I", 4, 0x04030201, 0x08070605)
-            self.assert_unpack("I", "I;16N", 2, 0x0201, 0x0403)
-            self.assert_unpack("I", "I;16NS", b"\x83\x01\x01\x83", 0x0183, -31999)
-            self.assert_unpack("I", "I;32N", 4, 0x04030201, 0x08070605)
-            self.assert_unpack(
+            [
+                (254, 253, 252, 251),
+                (250, 249, 248, 247),
+                (246, 245, 244, 243),
+            ],
+        ),
+        ("CMYK", "CMYK;L", 4, [(1, 4, 7, 10), (2, 5, 8, 11), (3, 6, 9, 12)]),
+        ("CMYK", "C", 1, [(1, 0, 0, 0), (2, 0, 0, 0), (3, 0, 0, 0)]),
+        ("CMYK", "M", 1, [(0, 1, 0, 0), (0, 2, 0, 0), (0, 3, 0, 0)]),
+        ("CMYK", "Y", 1, [(0, 0, 1, 0), (0, 0, 2, 0), (0, 0, 3, 0)]),
+        ("CMYK", "K", 1, [(0, 0, 0, 1), (0, 0, 0, 2), (0, 0, 0, 3)]),
+        ("CMYK", "C;I", 1, [(254, 0, 0, 0), (253, 0, 0, 0), (252, 0, 0, 0)]),
+        ("CMYK", "M;I", 1, [(0, 254, 0, 0), (0, 253, 0, 0), (0, 252, 0, 0)]),
+        ("CMYK", "Y;I", 1, [(0, 0, 254, 0), (0, 0, 253, 0), (0, 0, 252, 0)]),
+        ("CMYK", "K;I", 1, [(0, 0, 0, 254), (0, 0, 0, 253), (0, 0, 0, 252)]),
+    ]
+
+    # Mode YCbCr
+    params += [
+        ("YCbCr", "YCbCr", 3, [(1, 2, 3), (4, 5, 6), (7, 8, 9)]),
+        ("YCbCr", "YCbCr;L", 3, [(1, 4, 7), (2, 5, 8), (3, 6, 9)]),
+        ("YCbCr", "YCbCrK", 4, [(1, 2, 3), (5, 6, 7), (9, 10, 11)]),
+        ("YCbCr", "YCbCrX", 4, [(1, 2, 3), (5, 6, 7), (9, 10, 11)]),
+    ]
+
+    # Mode LAB
+    params += [
+        ("LAB", "LAB", 3, [(1, 130, 131), (4, 133, 134), (7, 136, 137)]),
+        ("LAB", "L", 1, [(1, 0, 0), (2, 0, 0), (3, 0, 0)]),
+        ("LAB", "A", 1, [(0, 1, 0), (0, 2, 0), (0, 3, 0)]),
+        ("LAB", "B", 1, [(0, 0, 1), (0, 0, 2), (0, 0, 3)]),
+    ]
+
+    # Mode HSV
+    params += [
+        ("HSV", "HSV", 3, [(1, 2, 3), (4, 5, 6), (7, 8, 9)]),
+        ("HSV", "H", 1, [(1, 0, 0), (2, 0, 0), (3, 0, 0)]),
+        ("HSV", "S", 1, [(0, 1, 0), (0, 2, 0), (0, 3, 0)]),
+        ("HSV", "V", 1, [(0, 0, 1), (0, 0, 2), (0, 0, 3)]),
+    ]
+
+    # Mode I
+    params += [
+        ("I", "I;8", 1, [0x01, 0x02, 0x03, 0x04]),
+        ("I", "I;8S", b"\x01\x83", [1, -125]),
+        ("I", "I;16", 2, [0x0201, 0x0403]),
+        ("I", "I;16S", b"\x83\x01\x01\x83", [0x0183, -31999]),
+        ("I", "I;16B", 2, [0x0102, 0x0304]),
+        ("I", "I;16BS", b"\x83\x01\x01\x83", [-31999, 0x0183]),
+        ("I", "I;32", 4, [0x04030201, 0x08070605]),
+        ("I", "I;32S", b"\x83\x00\x00\x01\x01\x00\x00\x83", [0x01000083, -2097151999]),
+        ("I", "I;32B", 4, [0x01020304, 0x05060708]),
+        ("I", "I;32BS", b"\x83\x00\x00\x01\x01\x00\x00\x83", [-2097151999, 0x01000083]),
+    ]
+    if is_big_endian():
+        params += [
+            ("I", "I", 4, [0x01020304, 0x05060708]),
+            ("I", "I;16N", 2, [0x0102, 0x0304]),
+            ("I", "I;16NS", b"\x83\x01\x01\x83", [-31999, 0x0183]),
+            ("I", "I;32N", 4, [0x01020304, 0x05060708]),
+            (
                 "I",
                 "I;32NS",
                 b"\x83\x00\x00\x01\x01\x00\x00\x83",
-                0x01000083,
-                -2097151999,
-            )
-        else:
-            self.assert_unpack("I", "I", 4, 0x01020304, 0x05060708)
-            self.assert_unpack("I", "I;16N", 2, 0x0102, 0x0304)
-            self.assert_unpack("I", "I;16NS", b"\x83\x01\x01\x83", -31999, 0x0183)
-            self.assert_unpack("I", "I;32N", 4, 0x01020304, 0x05060708)
-            self.assert_unpack(
+                [
+                    -2097151999,
+                    0x01000083,
+                ],
+            ),
+        ]
+    else:
+        params += [
+            ("I", "I", 4, [0x04030201, 0x08070605]),
+            ("I", "I;16N", 2, [0x0201, 0x0403]),
+            ("I", "I;16NS", b"\x83\x01\x01\x83", [0x0183, -31999]),
+            ("I", "I;32N", 4, [0x04030201, 0x08070605]),
+            (
                 "I",
                 "I;32NS",
                 b"\x83\x00\x00\x01\x01\x00\x00\x83",
-                -2097151999,
-                0x01000083,
-            )
-
-    def test_F_int(self) -> None:
-        self.assert_unpack("F", "F;8", 1, 0x01, 0x02, 0x03, 0x04)
-        self.assert_unpack("F", "F;8S", b"\x01\x83", 1, -125)
-        self.assert_unpack("F", "F;16", 2, 0x0201, 0x0403)
-        self.assert_unpack("F", "F;16S", b"\x83\x01\x01\x83", 0x0183, -31999)
-        self.assert_unpack("F", "F;16B", 2, 0x0102, 0x0304)
-        self.assert_unpack("F", "F;16BS", b"\x83\x01\x01\x83", -31999, 0x0183)
-        self.assert_unpack("F", "F;32", 4, 67305984, 134678016)
-        self.assert_unpack(
-            "F", "F;32S", b"\x83\x00\x00\x01\x01\x00\x00\x83", 16777348, -2097152000
-        )
-        self.assert_unpack("F", "F;32B", 4, 0x01020304, 0x05060708)
-        self.assert_unpack(
-            "F", "F;32BS", b"\x83\x00\x00\x01\x01\x00\x00\x83", -2097152000, 16777348
-        )
-
-        if sys.byteorder == "little":
-            self.assert_unpack("F", "F;16N", 2, 0x0201, 0x0403)
-            self.assert_unpack("F", "F;16NS", b"\x83\x01\x01\x83", 0x0183, -31999)
-            self.assert_unpack("F", "F;32N", 4, 67305984, 134678016)
-            self.assert_unpack(
+                [
+                    0x01000083,
+                    -2097151999,
+                ],
+            ),
+        ]
+
+    # Mode F int
+    params += [
+        ("F", "F;8", 1, [0x01, 0x02, 0x03, 0x04]),
+        ("F", "F;8S", b"\x01\x83", [1, -125]),
+        ("F", "F;16", 2, [0x0201, 0x0403]),
+        ("F", "F;16S", b"\x83\x01\x01\x83", [0x0183, -31999]),
+        ("F", "F;16B", 2, [0x0102, 0x0304]),
+        ("F", "F;16BS", b"\x83\x01\x01\x83", [-31999, 0x0183]),
+        ("F", "F;32", 4, [67305984, 134678016]),
+        ("F", "F;32S", b"\x83\x00\x00\x01\x01\x00\x00\x83", [16777348, -2097152000]),
+        ("F", "F;32B", 4, [0x01020304, 0x05060708]),
+        ("F", "F;32BS", b"\x83\x00\x00\x01\x01\x00\x00\x83", [-2097152000, 16777348]),
+    ]
+    if is_big_endian():
+        params += [
+            ("F", "F;16N", 2, [0x0102, 0x0304]),
+            ("F", "F;16NS", b"\x83\x01\x01\x83", [-31999, 0x0183]),
+            ("F", "F;32N", 4, [0x01020304, 0x05060708]),
+            (
                 "F",
                 "F;32NS",
                 b"\x83\x00\x00\x01\x01\x00\x00\x83",
-                16777348,
-                -2097152000,
-            )
-        else:
-            self.assert_unpack("F", "F;16N", 2, 0x0102, 0x0304)
-            self.assert_unpack("F", "F;16NS", b"\x83\x01\x01\x83", -31999, 0x0183)
-            self.assert_unpack("F", "F;32N", 4, 0x01020304, 0x05060708)
-            self.assert_unpack(
+                [-2097152000, 16777348],
+            ),
+        ]
+    else:
+        params += [
+            ("F", "F;16N", 2, [0x0201, 0x0403]),
+            ("F", "F;16NS", b"\x83\x01\x01\x83", [0x0183, -31999]),
+            ("F", "F;32N", 4, [67305984, 134678016]),
+            (
                 "F",
                 "F;32NS",
                 b"\x83\x00\x00\x01\x01\x00\x00\x83",
-                -2097152000,
-                16777348,
-            )
-
-    def test_F_float(self) -> None:
-        self.assert_unpack(
-            "F", "F;32F", 4, 1.539989614439558e-36, 4.063216068939723e-34
-        )
-        self.assert_unpack(
-            "F", "F;32BF", 4, 2.387939260590663e-38, 6.301941157072183e-36
-        )
-        self.assert_unpack(
+                [16777348, -2097152000],
+            ),
+        ]
+
+    # Mode F float
+    params += [
+        ("F", "F;32F", 4, [1.539989614439558e-36, 4.063216068939723e-34]),
+        ("F", "F;32BF", 4, [2.387939260590663e-38, 6.301941157072183e-36]),
+        (
             "F",
             "F;64F",
             b"333333\xc3?\x00\x00\x00\x00\x00J\x93\xc0",  # by struct.pack
-            0.15000000596046448,
-            -1234.5,
-        )
-        self.assert_unpack(
+            [0.15000000596046448, -1234.5],
+        ),
+        (
             "F",
             "F;64BF",
             b"?\xc3333333\xc0\x93J\x00\x00\x00\x00\x00",  # by struct.pack
-            0.15000000596046448,
-            -1234.5,
-        )
-
-        if sys.byteorder == "little":
-            self.assert_unpack(
-                "F", "F", 4, 1.539989614439558e-36, 4.063216068939723e-34
-            )
-            self.assert_unpack(
-                "F", "F;32NF", 4, 1.539989614439558e-36, 4.063216068939723e-34
-            )
-            self.assert_unpack(
+            [0.15000000596046448, -1234.5],
+        ),
+    ]
+    if is_big_endian():
+        params += [
+            ("F", "F", 4, [2.387939260590663e-38, 6.301941157072183e-36]),
+            ("F", "F;32NF", 4, [2.387939260590663e-38, 6.301941157072183e-36]),
+            (
                 "F",
                 "F;64NF",
-                b"333333\xc3?\x00\x00\x00\x00\x00J\x93\xc0",
-                0.15000000596046448,
-                -1234.5,
-            )
-        else:
-            self.assert_unpack(
-                "F", "F", 4, 2.387939260590663e-38, 6.301941157072183e-36
-            )
-            self.assert_unpack(
-                "F", "F;32NF", 4, 2.387939260590663e-38, 6.301941157072183e-36
-            )
-            self.assert_unpack(
+                b"?\xc3333333\xc0\x93J\x00\x00\x00\x00\x00",
+                [0.15000000596046448, -1234.5],
+            ),
+        ]
+    else:
+        params += [
+            ("F", "F", 4, [1.539989614439558e-36, 4.063216068939723e-34]),
+            ("F", "F;32NF", 4, [1.539989614439558e-36, 4.063216068939723e-34]),
+            (
                 "F",
                 "F;64NF",
-                b"?\xc3333333\xc0\x93J\x00\x00\x00\x00\x00",
-                0.15000000596046448,
-                -1234.5,
-            )
-
-    def test_I16(self) -> None:
-        self.assert_unpack("I;16", "I;16", 2, 0x0201, 0x0403, 0x0605)
-        self.assert_unpack("I;16", "I;16B", 2, 0x0102, 0x0304, 0x0506)
-        self.assert_unpack("I;16B", "I;16B", 2, 0x0102, 0x0304, 0x0506)
-        self.assert_unpack("I;16L", "I;16L", 2, 0x0201, 0x0403, 0x0605)
-        self.assert_unpack("I;16", "I;12", 2, 0x0010, 0x0203, 0x0040)
-        if sys.byteorder == "little":
-            self.assert_unpack("I;16", "I;16N", 2, 0x0201, 0x0403, 0x0605)
-            self.assert_unpack("I;16B", "I;16N", 2, 0x0201, 0x0403, 0x0605)
-            self.assert_unpack("I;16L", "I;16N", 2, 0x0201, 0x0403, 0x0605)
-            self.assert_unpack("I;16N", "I;16N", 2, 0x0201, 0x0403, 0x0605)
-        else:
-            self.assert_unpack("I;16", "I;16N", 2, 0x0102, 0x0304, 0x0506)
-            self.assert_unpack("I;16B", "I;16N", 2, 0x0102, 0x0304, 0x0506)
-            self.assert_unpack("I;16L", "I;16N", 2, 0x0102, 0x0304, 0x0506)
-            self.assert_unpack("I;16N", "I;16N", 2, 0x0102, 0x0304, 0x0506)
-
-    def test_CMYK16(self) -> None:
-        self.assert_unpack("CMYK", "CMYK;16L", 8, (2, 4, 6, 8), (10, 12, 14, 16))
-        self.assert_unpack("CMYK", "CMYK;16B", 8, (1, 3, 5, 7), (9, 11, 13, 15))
-        if sys.byteorder == "little":
-            self.assert_unpack("CMYK", "CMYK;16N", 8, (2, 4, 6, 8), (10, 12, 14, 16))
-        else:
-            self.assert_unpack("CMYK", "CMYK;16N", 8, (1, 3, 5, 7), (9, 11, 13, 15))
-
-    def test_value_error(self) -> None:
-        with pytest.raises(ValueError):
-            self.assert_unpack("L", "L", 0, 0)
-        with pytest.raises(ValueError):
-            self.assert_unpack("RGB", "RGB", 2, 0)
-        with pytest.raises(ValueError):
-            self.assert_unpack("CMYK", "CMYK", 2, 0)
+                b"333333\xc3?\x00\x00\x00\x00\x00J\x93\xc0",
+                [0.15000000596046448, -1234.5],
+            ),
+        ]
+
+    # Mode I;16
+    params += [
+        ("I;16", "I;16", 2, [0x0201, 0x0403, 0x0605]),
+        ("I;16", "I;16B", 2, [0x0102, 0x0304, 0x0506]),
+        ("I;16B", "I;16B", 2, [0x0102, 0x0304, 0x0506]),
+        ("I;16L", "I;16L", 2, [0x0201, 0x0403, 0x0605]),
+        ("I;16", "I;12", 2, [0x0010, 0x0203, 0x0040]),
+    ]
+    if is_big_endian():
+        params += [
+            ("I;16", "I;16N", 2, [0x0102, 0x0304, 0x0506]),
+            ("I;16B", "I;16N", 2, [0x0102, 0x0304, 0x0506]),
+            ("I;16L", "I;16N", 2, [0x0102, 0x0304, 0x0506]),
+            ("I;16N", "I;16N", 2, [0x0102, 0x0304, 0x0506]),
+        ]
+    else:
+        params += [
+            ("I;16", "I;16N", 2, [0x0201, 0x0403, 0x0605]),
+            ("I;16B", "I;16N", 2, [0x0201, 0x0403, 0x0605]),
+            ("I;16L", "I;16N", 2, [0x0201, 0x0403, 0x0605]),
+            ("I;16N", "I;16N", 2, [0x0201, 0x0403, 0x0605]),
+        ]
+
+    # Mode CMYK
+    params += [
+        ("CMYK", "CMYK;16L", 8, [(2, 4, 6, 8), (10, 12, 14, 16)]),
+        ("CMYK", "CMYK;16B", 8, [(1, 3, 5, 7), (9, 11, 13, 15)]),
+    ]
+    if is_big_endian():
+        params += [
+            ("CMYK", "CMYK;16N", 8, [(1, 3, 5, 7), (9, 11, 13, 15)]),
+        ]
+    else:
+        params += [
+            ("CMYK", "CMYK;16N", 8, [(2, 4, 6, 8), (10, 12, 14, 16)]),
+        ]
+
+    return params
+
+
+@pytest.mark.parametrize("mode, rawmode, data, pixels", get_unpack_parameters())
+def test_unpack(
+    mode: str, rawmode: str, data: int | bytes, pixels: list[float | tuple[int, ...]]
+) -> None:
+    """
+    Test unpacking from {rawmode} to {mode}.
+    data - Either the number of bytes in a pixel of the rawmode, or a byte string.
+           If a number is given, bytes will be generated starting at 1.
+           The byte string will be used to populate the starting image.
+    pixels - The pixels to be compared against the image pixels after unpacking.
+    """
+    if isinstance(data, int):
+        data_len = data * len(pixels)
+        data = bytes(range(1, data_len + 1))
+
+    im = Image.frombytes(mode, (len(pixels), 1), data, "raw", rawmode, 0, 1)
+
+    for x, pixel in enumerate(pixels):
+        assert pixel == im.getpixel((x, 0))
+
+
+@pytest.mark.parametrize(
+    "mode, rawmode, data, pixels",
+    (
+        # Mode BGR
+        ("BGR;15", "BGR;15", 3, [(8, 131, 0), (24, 0, 8), (41, 131, 8)]),
+        ("BGR;16", "BGR;16", 3, [(8, 64, 0), (24, 129, 0), (41, 194, 0)]),
+        ("BGR;24", "BGR;24", 3, [(1, 2, 3), (4, 5, 6), (7, 8, 9)]),
+    ),
+)
+def test_unpack_deprecated(
+    mode: str, rawmode: str, data: int | bytes, pixels: list[float | tuple[int, ...]]
+) -> None:
+    with pytest.warns(DeprecationWarning):
+        test_unpack(mode, rawmode, data, pixels)
+
+
+@pytest.mark.parametrize(
+    "mode, rawmode, data, pixels",
+    (
+        ("L", "L", 0, [0]),
+        ("RGB", "RGB", 2, [0]),
+        ("CMYK", "CMYK", 2, [0]),
+    ),
+)
+def test_unpack_valueerror(
+    mode: str, rawmode: str, data: int | bytes, pixels: list[float | tuple[int, ...]]
+) -> None:
+    with pytest.raises(ValueError):
+        test_unpack(mode, rawmode, data, pixels)