checks: add actionable assertion messages to advanced OOP checks

checks/oop_advanced/oop_advanced1.py

@@ -1,4 +1,5 @@
 dog = Dog()
-assert isinstance(dog, Animal)
-assert dog.speak() == "sound"
+assert isinstance(dog, Animal), "Dog() should be an instance of Animal"
+got = dog.speak()
+assert got == "sound", f"Dog().speak() should return 'sound', got {got!r}"
 print("oop_advanced1 ok")

checks/oop_advanced/oop_advanced2.py

@@ -1,4 +1,6 @@
 employee = Employee("Ada", "Engineer")
-assert employee.name == "Ada"
-assert employee.role == "Engineer"
+assert employee.name == "Ada", f"expected name 'Ada', got {employee.name!r}"
+assert employee.role == "Engineer", (
+    f"expected role 'Engineer', got {employee.role!r}"
+)
 print("oop_advanced2 ok")

checks/oop_advanced/oop_advanced3.py

@@ -1,3 +1,4 @@
 shapes = [Square(3), Rectangle(2, 5)]
-assert total_area(shapes) == 19
+area = total_area(shapes)
+assert area == 19, f"expected total_area(shapes) == 19, got {area!r}"
 print("oop_advanced3 ok")

checks/oop_advanced/oop_advanced4.py

@@ -1,3 +1,3 @@
 user = User("Lin")
-assert user.name == "Lin"
+assert user.name == "Lin", f"expected name 'Lin', got {user.name!r}"
 print("oop_advanced4 ok")

checks/oop_advanced/oop_advanced5.py

@@ -1,3 +1,4 @@
 playlist = Playlist(["one", "two", "three"])
-assert len(playlist) == 3
+count = len(playlist)
+assert count == 3, f"expected len(playlist) == 3, got {count!r}"
 print("oop_advanced5 ok")

checks/oop_advanced/oop_advanced6.py

@@ -1,2 +1,5 @@
-assert repr(Point(2, 5)) == "Point(x=2, y=5)"
+text = repr(Point(2, 5))
+assert text == "Point(x=2, y=5)", (
+    f"expected repr 'Point(x=2, y=5)', got {text!r}"
+)
 print("oop_advanced6 ok")