TST: Test for Boolean Series with missing to Categorical dtype (pandas-dev#29344)

Author: matttan90

pandas/tests/series/test_dtypes.py

@@ -377,6 +377,15 @@ def test_astype_categorical_to_categorical(
             result = s.astype("category")
             tm.assert_series_equal(result, expected)
 
+    def test_astype_bool_missing_to_categorical(self):
+        # GH-19182
+        s = Series([True, False, np.nan])
+        assert s.dtypes == np.object_
+
+        result = s.astype(CategoricalDtype(categories=[True, False]))
+        expected = Series(Categorical([True, False, np.nan], categories=[True, False]))
+        tm.assert_series_equal(result, expected)
+
     def test_astype_categoricaldtype(self):
         s = Series(["a", "b", "a"])
         result = s.astype(CategoricalDtype(["a", "b"], ordered=True))