def test_spawned_context_returns_value_from_parent(self):
key = object()
parent_value = 46
parent = DependencyContext()
parent.inject(key, parent_value)
child = parent.spawn()
expect(child.get(key)).to(be(parent_value))
def test_get_returns_original_if_unrelated_injected(self):
expected = object()
unrelated = object()
injected = object()
sut = DependencyContext()
sut.inject(unrelated, injected)
expect(sut.get(expected)).to(be(expected))
def test_spawned_context_does_not_replace_parent_value(self):
key = object()
parent_value = 37
child_value = 2
parent = DependencyContext()
parent.inject(key, parent_value)
child = parent.spawn()
child.inject(key, child_value)
expect(parent.get(key)).to(be(parent_value))
def test_spawned_context_can_override_parent_value(self):
key = object()
parent_value = 37
child_value = 2
parent = DependencyContext()
parent.inject(key, parent_value)
child = parent.spawn()
child.inject(key, child_value)
expect(child.get(key)).to(be(child_value))
def test_inherits_arbitrary_key_from_parent_context(self):
key = object()
parent_value = 'something'
child_value = None
def fetch():
nonlocal child_value
child_value = dependency(key)
parent_context = DependencyContext()
parent_context.inject(key, parent_value)
tc = parent_context.create_time_controller(target=fetch)
tc.start()
tc.join()
expect(child_value).to(equal(parent_value))
def test_get_returns_injected(self):
dependency = object()
injected = object()
sut = DependencyContext()
sut.inject(dependency, injected)
expect(sut.get(dependency)).to(be(injected))