TST: iat with duplicate column names (#33362)

Author: ShaharNaveh

pandas/tests/frame/indexing/test_iat.py

@@ -1,7 +1,16 @@
+import pandas as pd
+
+
 def test_iat(float_frame):
 
     for i, row in enumerate(float_frame.index):
         for j, col in enumerate(float_frame.columns):
             result = float_frame.iat[i, j]
             expected = float_frame.at[row, col]
             assert result == expected
+
+
+def test_iat_duplicate_columns():
+    # https://github.com/pandas-dev/pandas/issues/11754
+    df = pd.DataFrame([[1, 2]], columns=["x", "x"])
+    assert df.iat[0, 0] == 1