added a test function to test if a valueerror is thrown if a numeric column name is used in to_json

Author: chandra-teajunkie

pandas/tests/io/json/test_pandas.py

@@ -2283,3 +2283,9 @@ def test_large_number():
     )
     expected = Series([9999999999999999])
     tm.assert_series_equal(result, expected)
+
+
+def test_to_json_table_numeric_column_names():
+    df = DataFrame([[1, 2], [3, 4]], columns=[1, 2])
+    with pytest.raises(ValueError, match="Column names must be strings"):
+        df.to_json(orient="table")