Issue #25983: Added tests for multi-argument type().

Lib/test/test_builtin.py

@@ -1668,6 +1668,161 @@ class ShutdownTest(unittest.TestCase):
         self.assertEqual(["before", "after"], out.decode().splitlines())
 
 
+class TestType(unittest.TestCase):
+    def test_new_type(self):
+        A = type('A', (), {})
+        self.assertEqual(A.__name__, 'A')
+        self.assertEqual(A.__qualname__, 'A')
+        self.assertEqual(A.__module__, __name__)
+        self.assertEqual(A.__bases__, (object,))
+        self.assertIs(A.__base__, object)
+        x = A()
+        self.assertIs(type(x), A)
+        self.assertIs(x.__class__, A)
+
+        class B:
+            def ham(self):
+                return 'ham%d' % self
+        C = type('C', (B, int), {'spam': lambda self: 'spam%s' % self})
+        self.assertEqual(C.__name__, 'C')
+        self.assertEqual(C.__qualname__, 'C')
+        self.assertEqual(C.__module__, __name__)
+        self.assertEqual(C.__bases__, (B, int))
+        self.assertIs(C.__base__, int)
+        self.assertIn('spam', C.__dict__)
+        self.assertNotIn('ham', C.__dict__)
+        x = C(42)
+        self.assertEqual(x, 42)
+        self.assertIs(type(x), C)
+        self.assertIs(x.__class__, C)
+        self.assertEqual(x.ham(), 'ham42')
+        self.assertEqual(x.spam(), 'spam42')
+        self.assertEqual(x.to_bytes(2, 'little'), b'\x2a\x00')
+
+    def test_type_new_keywords(self):
+        class B:
+            def ham(self):
+                return 'ham%d' % self
+        C = type.__new__(type,
+                         name='C',
+                         bases=(B, int),
+                         dict={'spam': lambda self: 'spam%s' % self})
+        self.assertEqual(C.__name__, 'C')
+        self.assertEqual(C.__qualname__, 'C')
+        self.assertEqual(C.__module__, __name__)
+        self.assertEqual(C.__bases__, (B, int))
+        self.assertIs(C.__base__, int)
+        self.assertIn('spam', C.__dict__)
+        self.assertNotIn('ham', C.__dict__)
+
+    def test_type_name(self):
+        for name in 'A', '\xc4', '\U0001f40d', 'B.A', '42', '':
+            with self.subTest(name=name):
+                A = type(name, (), {})
+                self.assertEqual(A.__name__, name)
+                self.assertEqual(A.__qualname__, name)
+                self.assertEqual(A.__module__, __name__)
+        with self.assertRaises(ValueError):
+            type('A\x00B', (), {})
+        with self.assertRaises(ValueError):
+            type('A\udcdcB', (), {})
+        with self.assertRaises(TypeError):
+            type(b'A', (), {})
+
+        C = type('C', (), {})
+        for name in 'A', '\xc4', '\U0001f40d', 'B.A', '42', '':
+            with self.subTest(name=name):
+                C.__name__ = name
+                self.assertEqual(C.__name__, name)
+                self.assertEqual(C.__qualname__, 'C')
+                self.assertEqual(C.__module__, __name__)
+
+        A = type('C', (), {})
+        with self.assertRaises(ValueError):
+            A.__name__ = 'A\x00B'
+        self.assertEqual(A.__name__, 'C')
+        with self.assertRaises(ValueError):
+            A.__name__ = 'A\udcdcB'
+        self.assertEqual(A.__name__, 'C')
+        with self.assertRaises(TypeError):
+            A.__name__ = b'A'
+        self.assertEqual(A.__name__, 'C')
+
+    def test_type_qualname(self):
+        A = type('A', (), {'__qualname__': 'B.C'})
+        self.assertEqual(A.__name__, 'A')
+        self.assertEqual(A.__qualname__, 'B.C')
+        self.assertEqual(A.__module__, __name__)
+        with self.assertRaises(TypeError):
+            type('A', (), {'__qualname__': b'B'})
+        self.assertEqual(A.__qualname__, 'B.C')
+
+        A.__qualname__ = 'D.E'
+        self.assertEqual(A.__name__, 'A')
+        self.assertEqual(A.__qualname__, 'D.E')
+        with self.assertRaises(TypeError):
+            A.__qualname__ = b'B'
+        self.assertEqual(A.__qualname__, 'D.E')
+
+    def test_type_doc(self):
+        for doc in 'x', '\xc4', '\U0001f40d', 'x\x00y', b'x', 42, None:
+            A = type('A', (), {'__doc__': doc})
+            self.assertEqual(A.__doc__, doc)
+        with self.assertRaises(UnicodeEncodeError):
+            type('A', (), {'__doc__': 'x\udcdcy'})
+
+        A = type('A', (), {})
+        self.assertEqual(A.__doc__, None)
+        for doc in 'x', '\xc4', '\U0001f40d', 'x\x00y', 'x\udcdcy', b'x', 42, None:
+            A.__doc__ = doc
+            self.assertEqual(A.__doc__, doc)
+
+    def test_bad_args(self):
+        with self.assertRaises(TypeError):
+            type()
+        with self.assertRaises(TypeError):
+            type('A', ())
+        with self.assertRaises(TypeError):
+            type('A', (), {}, ())
+        with self.assertRaises(TypeError):
+            type('A', (), dict={})
+        with self.assertRaises(TypeError):
+            type('A', [], {})
+        with self.assertRaises(TypeError):
+            type('A', (), types.MappingProxyType({}))
+        with self.assertRaises(TypeError):
+            type('A', (None,), {})
+        with self.assertRaises(TypeError):
+            type('A', (bool,), {})
+        with self.assertRaises(TypeError):
+            type('A', (int, str), {})
+
+    def test_bad_slots(self):
+        with self.assertRaises(TypeError):
+            type('A', (), {'__slots__': b'x'})
+        with self.assertRaises(TypeError):
+            type('A', (int,), {'__slots__': 'x'})
+        with self.assertRaises(TypeError):
+            type('A', (), {'__slots__': ''})
+        with self.assertRaises(TypeError):
+            type('A', (), {'__slots__': '42'})
+        with self.assertRaises(TypeError):
+            type('A', (), {'__slots__': 'x\x00y'})
+        with self.assertRaises(ValueError):
+            type('A', (), {'__slots__': 'x', 'x': 0})
+        with self.assertRaises(TypeError):
+            type('A', (), {'__slots__': ('__dict__', '__dict__')})
+        with self.assertRaises(TypeError):
+            type('A', (), {'__slots__': ('__weakref__', '__weakref__')})
+
+        class B:
+            pass
+        with self.assertRaises(TypeError):
+            type('A', (B,), {'__slots__': '__dict__'})
+        with self.assertRaises(TypeError):
+            type('A', (B,), {'__slots__': '__weakref__'})
+
+
 def load_tests(loader, tests, pattern):
     from doctest import DocTestSuite
     tests.addTest(DocTestSuite(builtins))