tests/basics: Expand test cases for equality of subclasses.

tests/basics/subclass_native2_tuple.py

@@ -19,3 +19,11 @@ a = Ctuple2()
 print(len(a))
 a = Ctuple2([1, 2, 3])
 print(len(a))
+
+a = tuple([1,2,3])
+b = Ctuple1([1,2,3])
+c = Ctuple2([1,2,3])
+
+print(a == b)
+print(b == c)
+print(c == a)