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TST: add regression test for interpolate(method='time') with Int64/Float64 (#40252) #62286

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TST: add regression test for interpolate(method='time') with Int64/Float64 (#40252) #62286

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15 changes: 15 additions & 0 deletions pandas/tests/frame/methods/test_interpolate.py
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Original file line number Diff line number Diff line change
Expand Up @@ -440,3 +440,18 @@ def test_interpolate_arrow(self, dtype):
result = df.interpolate(limit=2)
expected = DataFrame({"a": [1, 1.5, 2.0, None, 3]}, dtype="float64[pyarrow]")
tm.assert_frame_equal(result, expected)

def test_interpolate_time_nullable_int_float(self):
# GH#40252 regression test
idx = date_range("1970-01-02", periods=3, freq="D")

# Nullable Int64
df_int = DataFrame({"a": [1, None, 2]}, index=idx, dtype="Int64")
result_int = df_int.interpolate(method="time")
expected = DataFrame({"a": [1.0, 1.5, 2.0]}, index=idx, dtype="Float64")
tm.assert_frame_equal(result_int, expected)

# Nullable Float64
df_float = df_int.astype("Float64")
result_float = df_float.interpolate(method="time")
tm.assert_frame_equal(result_float, expected)
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