def METHOD_NAME(self):
    src = """
    x = 10
    for y in range(1, 10):
        x = func(y)
        print(x)
    x = x - 1
    """
    mod = astroid.parse(src)
    mod.accept(CFGVisitor())
    assign_x1, assign_x2, assign_x3 = mod.nodes_of_class(nodes.Assign)
    self.checker.visit_module(mod)
    with self.assertNoMessages():
        self.checker.visit_assign(assign_x1)
        self.checker.visit_assign(assign_x2)
        self.checker.visit_assign(assign_x3)