TST/REF: Move static methods out of consistency classes

pandas/tests/window/moments/test_moments_ewm.py

@@ -281,24 +281,26 @@ def setup_method(self, method):
     def test_ewmcov_pairwise(self):
         self._check_pairwise_moment("ewm", "cov", span=10, min_periods=5)
 
-    @pytest.mark.parametrize("name", ["cov", "corr"])
-    def test_ewm_corr_cov(self, name, min_periods, binary_ew_data):
-        A, B = binary_ew_data
-
-        check_binary_ew(name="corr", A=A, B=B)
-        check_binary_ew_min_periods("corr", min_periods, A, B)
-
     def test_ewmcorr_pairwise(self):
         self._check_pairwise_moment("ewm", "corr", span=10, min_periods=5)
 
-    @pytest.mark.parametrize("name", ["cov", "corr"])
-    def test_different_input_array_raise_exception(self, name, binary_ew_data):
 
-        A, _ = binary_ew_data
-        msg = "Input arrays must be of the same type!"
-        # exception raised is Exception
-        with pytest.raises(Exception, match=msg):
-            ew_func(A, randn(50), 20, name=name, min_periods=5)
+@pytest.mark.parametrize("name", ["cov", "corr"])
+def test_ewm_corr_cov(name, min_periods, binary_ew_data):
+    A, B = binary_ew_data
+
+    check_binary_ew(name="corr", A=A, B=B)
+    check_binary_ew_min_periods("corr", min_periods, A, B)
+
+
+@pytest.mark.parametrize("name", ["cov", "corr"])
+def test_different_input_array_raise_exception(name, binary_ew_data):
+
+    A, _ = binary_ew_data
+    msg = "Input arrays must be of the same type!"
+    # exception raised is Exception
+    with pytest.raises(Exception, match=msg):
+        ew_func(A, randn(50), 20, name=name, min_periods=5)
 
 
 @pytest.mark.slow