added usage of assertIsNot

Author: flexatone

test/test_util.py

@@ -177,7 +177,7 @@ def test_array_deepcopy_a1(self) -> None:
         memo = {}
         a2 = array_deepcopy(a1, memo)
 
-        self.assertNotEqual(id(a1), id(a2))
+        self.assertIsNot(a1, a2)
         self.assertNotEqual(mloc(a1), mloc(a2))
         self.assertFalse(a2.flags.writeable)
         self.assertEqual(a1.dtype, a2.dtype)
@@ -187,7 +187,7 @@ def test_array_deepcopy_a2(self) -> None:
         memo = {}
         a2 = array_deepcopy(a1, memo)
 
-        self.assertNotEqual(id(a1), id(a2))
+        self.assertIsNot(a1, a2)
         self.assertNotEqual(mloc(a1), mloc(a2))
         self.assertIn(id(a1), memo)
         self.assertEqual(memo[id(a1)].tolist(), a2.tolist())
@@ -208,19 +208,19 @@ def test_array_deepcopy_c1(self) -> None:
         a1 = np.array((None, 'foo', True, mutable))
         a2 = array_deepcopy(a1, memo)
 
-        self.assertNotEqual(id(a1), id(a2))
+        self.assertIsNot(a1, a2)
         self.assertNotEqual(mloc(a1), mloc(a2))
-        self.assertNotEqual(id(a1[3]), id(a2[3]))
+        self.assertIsNot(a1[3], a2[3])
         self.assertFalse(a2.flags.writeable)
 
     def test_array_deepcopy_c2(self) -> None:
         memo = {}
         mutable = [np.nan]
         a1 = np.array((None, 'foo', True, mutable))
         a2 = array_deepcopy(a1, memo)
-        self.assertNotEqual(id(a1), id(a2))
+        self.assertIsNot(a1, a2)
         self.assertNotEqual(mloc(a1), mloc(a2))
-        self.assertNotEqual(id(a1[3]), id(a2[3]))
+        self.assertIsNot(a1[3], a2[3])
         self.assertFalse(a2.flags.writeable)
         self.assertIn(id(a1), memo)