Fix test_copy: remove duplicated test

Author: vstinner

Lib/test/test_copy.py

@@ -134,16 +134,10 @@ def test_copy_dict(self):
         self.assertIsNot(y, x)
 
     def test_copy_frozendict(self):
-        x = frozendict(foo=1, bar=2)
-        y = copy.copy(x)
-        self.assertEqual(y, x)
-        self.assertEqual(type(y), frozendict)
-        self.assertIsNot(y, x)
+        x = frozendict(x=1, y=2)
+        self.assertIs(copy.copy(x), x)
         x = frozendict()
-        y = copy.copy(x)
-        self.assertEqual(y, x)
-        self.assertEqual(type(y), frozendict)
-        self.assertIsNot(y, x)
+        self.assertIs(copy.copy(x), x)
 
     def test_copy_set(self):
         x = {1, 2, 3}
@@ -161,12 +155,6 @@ def test_copy_frozenset(self):
         x = frozenset()
         self.assertIs(copy.copy(x), x)
 
-    def test_copy_frozendict(self):
-        x = frozendict(x=1, y=2)
-        self.assertIs(copy.copy(x), x)
-        x = frozendict()
-        self.assertIs(copy.copy(x), x)
-
     def test_copy_bytearray(self):
         x = bytearray(b'abc')
         y = copy.copy(x)