def test_a():
x = basics.A(5)
x.a = 10
assert_equal(x.a, 10)
x.a = 42
assert_equal(x.a, 42)
x.call()
assert_equal(x.a, 1)
def test_b():
x = basics.A()
x.a = 10
y = basics.B()
y.b = 11
assert_equal(y.b, 11)
y.b = 43
assert_equal(y.b, 43)
y.call()
assert_equal(y.b, 1)
y.from_a(x)
assert_equal(y.b, 10)
assert_true(isinstance(y, basics.A))
def test_c():
x = basics.A()
x.a = 10
y = basics.B()
y.b = 11
z = basics.C()
z.c = 12
assert_equal(z.c, 12)
z.c = 44
assert_equal(z.c, 44)
z.call()
assert_equal(z.c, 1)
z.from_a(x)
assert_equal(z.b, 10)
assert_true(isinstance(z, basics.A))
assert_true(isinstance(z, basics.B))