TST: For GH4861, Period and datetime in multiindex

pandas/tests/indexes/period/test_period.py

@@ -1,3 +1,5 @@
+from datetime import datetime
+
 import numpy as np
 import pytest
 
@@ -570,3 +572,20 @@ def test_maybe_convert_timedelta():
     offset = offsets.BusinessDay()
     with pytest.raises(ValueError, match='freq'):
         pi._maybe_convert_timedelta(offset)
+
+
+def test_multiindex_period_datetime():
+    # GH4861, using datetime in period of multiindex raises exception
+
+    idx1 = Index(['a', 'a', 'a', 'b', 'b'])
+    idx2 = period_range('2012-01', periods=len(idx1), freq='M')
+    s = Series(np.random.randn(len(idx1)), [idx1, idx2])
+
+    # try Period as index
+    expected = s.iloc[0]
+    result = s.loc['a', Period('2012-01')]
+    assert result == expected
+
+    # try datetime as index
+    result = s.loc['a', datetime(2012, 1, 1)]
+    assert result == expected