tests: Add tests to improve coverage of py/objtype.c.

tests/basics/class_inherit_mul.py

+# test multiple inheritance of user classes
+
 class A:
     def __init__(self, x):
         print('A init', x)
@@ -30,6 +32,9 @@ class Sub(A, B):
     def g(self):
         print(self.x)
 
+print(issubclass(Sub, A))
+print(issubclass(Sub, B))
+
 o = Sub()
 print(o.x)
 o.f()

tests/basics/class_super_multinherit.py

+# test super with multiple inheritance
+
+class A:
+    def foo(self):
+        print('A.foo')
+
+class B:
+    def foo(self):
+        print('B.foo')
+
+class C(A, B):
+    def foo(self):
+        print('C.foo')
+        super().foo()
+
+C().foo()

tests/basics/sys_getsizeof.py

+# test sys.getsizeof() function
+
+import sys
+try:
+    sys.getsizeof
+except AttributeError:
+    print('SKIP')
+    raise SystemExit
+
+print(sys.getsizeof([1, 2]) >= 2)
+print(sys.getsizeof({1: 2}) >= 2)
+
+class A:
+    pass
+print(sys.getsizeof(A()) > 0)

tests/misc/non_compliant.py

@@ -124,3 +124,18 @@ try:
     f.x = 1
 except AttributeError:
     print('AttributeError')
+
+# can't call a function type (ie make new instances of a function)
+try:
+    type(f)()
+except TypeError:
+    print('TypeError')
+
+# test when object explicitly listed at not-last position in parent tuple
+# this is not compliant with CPython because of illegal MRO
+class A:
+    def foo(self):
+        print('A.foo')
+class B(object, A):
+    pass
+B().foo()

tests/misc/non_compliant.py.exp

@@ -18,3 +18,5 @@ b'\x01\x02'
 b'\x01\x00'
 NotImplementedError
 AttributeError
+TypeError
+A.foo