Fix tests

Author: sergey-miryanov

Lib/test/test_ctypes/test_pointers.py

@@ -127,10 +127,15 @@ def test_basics(self):
     def test_from_address(self):
         a = array.array('i', [100, 200, 300, 400, 500])
         addr = a.buffer_info()[0]
+        p = POINTER(POINTER(c_int))
+
+    def test_pointer_from_pointer(self):
         p1 = POINTER(c_int)
         p2 = POINTER(p1)
 
         self.assertIsNot(p1, p2)
+        self.assertIs(p1.__pointer_type__, p2)
+        self.assertIs(p2._type_, p1)
 
     def test_other(self):
         class Table(Structure):
@@ -228,12 +233,13 @@ def test_pointer_types_equal(self):
         self.assertIs(t1, t2)
 
         p1 = t1(c_int(1))
-        p2 = t2(c_int(1))
-        p3 = pointer(c_int(1))
+        p2 = pointer(c_int(1))
 
         self.assertIsInstance(p1, t1)
         self.assertIsInstance(p2, t1)
-        self.assertIsInstance(p3, t1)
+
+        self.assertIs(type(p1), t1)
+        self.assertIs(type(p2), t1)
 
     def test_incomplete_pointer_types_not_equal(self):
         t1 = POINTER("LP_C")
@@ -246,10 +252,6 @@ def test_incomplete_pointer_types_cannot_instantiate(self):
         with self.assertRaisesRegex(TypeError, "has no _type_"):
             t1()
 
-        msg = "<class 'str'> must have storage info"
-        with self.assertRaisesRegex(TypeError, msg):
-            pointer("LP_C")
-
     def test_pointer_set_type_twice(self):
         t1 = POINTER(c_int)
         self.assertIs(c_int.__pointer_type__, t1)