Add test case for creation from records

Author: mrkn

pandas/tests/frame/test_constructors.py

@@ -8,6 +8,7 @@
 from collections.abc import (
     Iterator,
     Mapping,
+    Sequence,
 )
 from dataclasses import make_dataclass
 from datetime import (
@@ -94,6 +95,19 @@ def __len__(self):
         return self._dict.__len__()
 
 
+class ListWrapper(Sequence):
+    _list: list
+
+    def __init__(self, lst: list) -> None:
+        self._list = lst
+
+    def __getitem__(self, i):
+        return self._list[i]
+
+    def __len__(self):
+        return self._list.__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
@@ -2931,6 +2945,36 @@ def test_from_dict_with_mapping(self):
         tm.assert_series_equal(df["A"], Series(idx, name="A"))
         tm.assert_series_equal(df["B"], Series(dr, name="B"))
 
+    def test_from_mappiog_list(self):
+        idx = Index(date_range("20130101", periods=3, tz="US/Eastern"), name="foo")
+        dr = date_range("20130110", periods=3)
+        data = DataFrame({"A": idx, "B": dr})
+        mapping_list = [
+            DictWrapper(record) for record in data.to_dict(orient="records")
+        ]
+
+        # construction
+        df = DataFrame(mapping_list)
+        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_mappiog_sequence(self):
+        idx = Index(date_range("20130101", periods=3, tz="US/Eastern"), name="foo")
+        dr = date_range("20130110", periods=3)
+        data = DataFrame({"A": idx, "B": dr})
+        mapping_list = ListWrapper(
+            [DictWrapper(record) for record in data.to_dict(orient="records")]
+        )
+
+        # construction
+        df = DataFrame(mapping_list)
+        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")