TST: pct_change from generic to frame (#37504)

Author: jbrockmendel

pandas/tests/frame/methods/test_pct_change.py

@@ -6,6 +6,27 @@
 
 
 class TestDataFramePctChange:
+    @pytest.mark.parametrize(
+        "periods,fill_method,limit,exp",
+        [
+            (1, "ffill", None, [np.nan, np.nan, np.nan, 1, 1, 1.5, 0, 0]),
+            (1, "ffill", 1, [np.nan, np.nan, np.nan, 1, 1, 1.5, 0, np.nan]),
+            (1, "bfill", None, [np.nan, 0, 0, 1, 1, 1.5, np.nan, np.nan]),
+            (1, "bfill", 1, [np.nan, np.nan, 0, 1, 1, 1.5, np.nan, np.nan]),
+            (-1, "ffill", None, [np.nan, np.nan, -0.5, -0.5, -0.6, 0, 0, np.nan]),
+            (-1, "ffill", 1, [np.nan, np.nan, -0.5, -0.5, -0.6, 0, np.nan, np.nan]),
+            (-1, "bfill", None, [0, 0, -0.5, -0.5, -0.6, np.nan, np.nan, np.nan]),
+            (-1, "bfill", 1, [np.nan, 0, -0.5, -0.5, -0.6, np.nan, np.nan, np.nan]),
+        ],
+    )
+    @pytest.mark.parametrize("klass", [DataFrame, Series])
+    def test_pct_change_with_nas(self, periods, fill_method, limit, exp, klass):
+        vals = [np.nan, np.nan, 1, 2, 4, 10, np.nan, np.nan]
+        obj = klass(vals)
+
+        res = obj.pct_change(periods=periods, fill_method=fill_method, limit=limit)
+        tm.assert_equal(res, klass(exp))
+
     def test_pct_change_numeric(self):
         # GH#11150
         pnl = DataFrame(

pandas/tests/generic/test_generic.py

@@ -356,29 +356,6 @@ def test_copy_and_deepcopy(self, shape, func):
         assert obj_copy is not obj
         self._compare(obj_copy, obj)
 
-    @pytest.mark.parametrize(
-        "periods,fill_method,limit,exp",
-        [
-            (1, "ffill", None, [np.nan, np.nan, np.nan, 1, 1, 1.5, 0, 0]),
-            (1, "ffill", 1, [np.nan, np.nan, np.nan, 1, 1, 1.5, 0, np.nan]),
-            (1, "bfill", None, [np.nan, 0, 0, 1, 1, 1.5, np.nan, np.nan]),
-            (1, "bfill", 1, [np.nan, np.nan, 0, 1, 1, 1.5, np.nan, np.nan]),
-            (-1, "ffill", None, [np.nan, np.nan, -0.5, -0.5, -0.6, 0, 0, np.nan]),
-            (-1, "ffill", 1, [np.nan, np.nan, -0.5, -0.5, -0.6, 0, np.nan, np.nan]),
-            (-1, "bfill", None, [0, 0, -0.5, -0.5, -0.6, np.nan, np.nan, np.nan]),
-            (-1, "bfill", 1, [np.nan, 0, -0.5, -0.5, -0.6, np.nan, np.nan, np.nan]),
-        ],
-    )
-    def test_pct_change(self, periods, fill_method, limit, exp):
-        vals = [np.nan, np.nan, 1, 2, 4, 10, np.nan, np.nan]
-        obj = self._typ(vals)
-        func = getattr(obj, "pct_change")
-        res = func(periods=periods, fill_method=fill_method, limit=limit)
-        if type(obj) is DataFrame:
-            tm.assert_frame_equal(res, DataFrame(exp))
-        else:
-            tm.assert_series_equal(res, Series(exp))
-
 
 class TestNDFrame:
     # tests that don't fit elsewhere