Add new tests

py-polars/tests/unit/datatypes/test_string.py

@@ -0,0 +1,28 @@
+import polars as pl
+from polars.testing import assert_series_equal
+
+
+def test_series_init_string() -> None:
+    s = pl.Series(["a", "b"])
+    assert s.dtype == pl.String
+
+
+def test_utf8_alias_eq() -> None:
+    assert pl.Utf8 == pl.String()
+    assert pl.Utf8() == pl.String
+    assert pl.Utf8() == pl.String()
+
+
+def test_utf8_alias_hash() -> None:
+    assert hash(pl.Utf8()) == hash(pl.String())
+
+
+def test_utf8_alias_series_init() -> None:
+    s = pl.Series(["a", "b"], dtype=pl.Utf8)
+    assert s.dtype == pl.String
+
+
+def test_utf8_alias_lit() -> None:
+    result = pl.select(a=pl.lit(5, dtype=pl.Utf8)).to_series()
+    expected = pl.Series("a", ["5"], dtype=pl.String)
+    assert_series_equal(result, expected)

py-polars/tests/unit/interchange/test_utils.py

@@ -29,6 +29,7 @@
         (pl.Float64, (DtypeKind.FLOAT, 64, "g", NE)),
         (pl.Boolean, (DtypeKind.BOOL, 1, "b", NE)),
         (pl.String, (DtypeKind.STRING, 8, "U", NE)),
+        (pl.Utf8, (DtypeKind.STRING, 8, "U", NE)),
         (pl.Date, (DtypeKind.DATETIME, 32, "tdD", NE)),
         (pl.Time, (DtypeKind.DATETIME, 64, "ttu", NE)),
         (pl.Categorical, (DtypeKind.CATEGORICAL, 32, "I", NE)),