diff --git a/tests/unit/test_blob.py b/tests/unit/test_blob.py
index a680cd747..1ca86f4e4 100644
--- a/tests/unit/test_blob.py
+++ b/tests/unit/test_blob.py
@@ -1696,8 +1696,8 @@ def _download_as_text_helper(
 
         blob.download_as_bytes.assert_called_once_with(
             client=client,
-            start=client,
-            end=client,
+            start=start,
+            end=end,
             raw_download=raw_download,
             timeout=expected_timeout,
             if_generation_match=if_generation_match,
@@ -1712,6 +1712,15 @@ def test_download_as_text_wo_raw(self):
     def test_download_as_text_w_raw(self):
         self._download_as_text_helper(raw_download=True)
 
+    def test_download_as_text_w_client(self):
+        self._download_as_text_helper(raw_download=False, client=object())
+
+    def test_download_as_text_w_start(self):
+        self._download_as_text_helper(raw_download=False, start=123)
+
+    def test_download_as_text_w_end(self):
+        self._download_as_text_helper(raw_download=False, end=456)
+
     def test_download_as_text_w_custom_timeout(self):
         self._download_as_text_helper(raw_download=False, timeout=9.58)
 
@@ -1727,6 +1736,19 @@ def test_download_as_text_w_if_metageneration_match(self):
     def test_download_as_text_w_if_metageneration_not_match(self):
         self._download_as_text_helper(raw_download=False, if_metageneration_not_match=6)
 
+    def test_download_as_text_w_encoding(self):
+        encoding = "utf-16"
+        self._download_as_text_helper(
+            raw_download=False,
+            encoding=encoding,
+        )
+
+    def test_download_as_text_w_no_charset(self):
+        self._download_as_text_helper(
+            raw_download=False,
+            no_charset=True,
+        )
+
     def test_download_as_text_w_non_ascii_w_explicit_encoding(self):
         expected_value = u"\x0AFe"
         encoding = "utf-16"