def test_can_override_in_children():
sm = SpecificationMapper()
child = sm.new_child_mapper()
sm.define_specification_for('foo', const(1))
child.define_specification_for('foo', const(2))
assert sm.specification_for('foo') == 1
assert child.specification_for('foo') == 2
def test_child_can_call_other_specs_on_prototype():
s = SpecificationMapper()
s.define_specification_for('bar',
lambda t, d: t.specification_for('foo') + 1)
s2 = s.new_child_mapper()
s2.define_specification_for('foo', const(1))
assert s2.specification_for('bar') == 2
def test_cache_correctly_handles_inheritance():
s = SpecificationMapper()
s.define_specification_for_instances(
list, lambda s, d: [s.specification_for(d[0])])
t = s.new_child_mapper()
t.define_specification_for_instances(str, lambda *_: Foo())
x = t.specification_for('foo')
y = t.specification_for(['foo'])[0]
assert x is y
def test_can_create_children():
sm = SpecificationMapper()
child = sm.new_child_mapper()
sm.define_specification_for('foo', const(1))
assert child.specification_for('foo') == 1
