use list instead of numpy array so that Series.__rmatmul__ is actually called

Author: minggli

pandas/tests/series/test_analytics.py

@@ -849,14 +849,15 @@ def test_matmul(self):
         expected = np.dot(a.values, a.values)
         assert_almost_equal(result, expected)
 
-        # np.array @ Series (__rmatmul__)
-        result = operator.matmul(a.values, a)
+        # GH 21530
+        # vector (list) @ Series (__rmatmul__)
+        result = operator.matmul(a.values.tolist(), a)
         expected = np.dot(a.values, a.values)
         assert_almost_equal(result, expected)
 
         # GH 21530
-        # np.array (matrix) @ Series (__rmatmul__)
-        result = operator.matmul(b.T.values, a)
+        # matrix (nested lists) @ Series (__rmatmul__)
+        result = operator.matmul(b.T.values.tolist(), a)
         expected = np.dot(b.T.values, a.values)
         assert_almost_equal(result, expected)