test compares the whole dataframe & reformatted

Author: saucoide

pandas/io/clipboards.py

@@ -59,8 +59,7 @@ def read_clipboard(sep=r"\s+", **kwargs):  # pragma: no cover
     # 1  3  4
 
     counts = {
-        x.count("\t") if i > 0 else x.lstrip().count("\t")
-        for i, x in enumerate(lines)
+        x.count("\t") if i > 0 else x.lstrip().count("\t") for i, x in enumerate(lines)
     }
     if len(lines) > 1 and len(counts) == 1 and counts.pop() != 0:
         sep = "\t"

pandas/tests/io/test_clipboard.py

@@ -243,16 +243,19 @@ def test_read_clipboard_infer_excel(self, request, mock_clipboard):
 
         tm.assert_frame_equal(res, exp)
 
-    # Tests that nulls on the first column do not trip infering excel format
     def test_infer_excel_with_nulls(self, request, mock_clipboard):
         # GH41108
         text = "col1\tcol2\n1\tred\n\tblue\n2\tgreen"
 
         mock_clipboard[request.node.name] = text
         df = read_clipboard()
+        df_expected = DataFrame(
+            data={"col1": [1, None, 2], "col2": ["red", "blue", "green"]}
+        )
 
         # excel data is parsed correctly
         assert df.iloc[1][1] == "blue"
+        assert df.equals(df_expected)
 
     def test_invalid_encoding(self, df):
         msg = "clipboard only supports utf-8 encoding"