Add test

Author: mrkn

pandas/tests/frame/test_constructors.py

@@ -5,7 +5,10 @@
     defaultdict,
     namedtuple,
 )
-from collections.abc import Iterator
+from collections.abc import (
+    Iterator,
+    Mapping,
+)
 from dataclasses import make_dataclass
 from datetime import (
     date,
@@ -75,6 +78,22 @@
 ]
 
 
+class DictWrapper(Mapping):
+    _dict: dict
+
+    def __init__(self, d: dict) -> None:
+        self._dict = d
+
+    def __getitem__(self, key):
+        return self._dict[key]
+
+    def __iter__(self):
+        return self._dict.__iter__()
+
+    def __len__(self):
+        return self._dict.__len__()
+
+
 class TestDataFrameConstructors:
     def test_constructor_from_ndarray_with_str_dtype(self):
         # If we don't ravel/reshape around ensure_str_array, we end up
@@ -2901,6 +2920,17 @@ def test_from_dict(self):
         tm.assert_series_equal(df["A"], Series(idx, name="A"))
         tm.assert_series_equal(df["B"], Series(dr, name="B"))
 
+    def test_from_dict_with_mapping(self):
+        idx = Index(date_range("20130101", periods=3, tz="US/Eastern"), name="foo")
+        dr = date_range("20130110", periods=3)
+
+        # construction
+        df = DataFrame(DictWrapper({"A": idx, "B": dr}))
+        assert df["A"].dtype, "M8[ns, US/Eastern"
+        assert df["A"].name == "A"
+        tm.assert_series_equal(df["A"], Series(idx, name="A"))
+        tm.assert_series_equal(df["B"], Series(dr, name="B"))
+
     def test_from_index(self):
         # from index
         idx2 = date_range("20130101", periods=3, tz="US/Eastern", name="foo")