add test for columns.name

Author: quangngd

pandas/tests/io/formats/test_to_latex.py

@@ -845,6 +845,25 @@ def test_to_latex_escape_special_chars_in_index_names(self):
         )
         assert result == expected
 
+    def test_to_latex_escape_special_chars_in_column_name(self):
+        df = DataFrame({"A": [1, 2, 3], "B": ["a", "b", "c"]})
+        df.columns.name = "_^~"
+        result = df.to_latex(escape=True)
+        expected = _dedent(
+            r"""
+            \begin{tabular}{lrl}
+            \toprule
+            \_\textasciicircum \textasciitilde  & A & B \\
+            \midrule
+            0 & 1 & a \\
+            1 & 2 & b \\
+            2 & 3 & c \\
+            \bottomrule
+            \end{tabular}
+            """
+        )
+        assert result == expected
+
     def test_to_latex_specified_header_special_chars_without_escape(self):
         # GH 7124
         df = DataFrame({"a": [1, 2], "b": ["b1", "b2"]})