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from random import random
from unittest import TestCase
from inject import Injector, InjectorException
class TestInjector(TestCase):
def test_instance_binding__should_use_the_same_instance(self):
injector = Injector(lambda binder: binder.bind(int, 123))
instance = injector.get_instance(int)
assert instance == 123
def test_constructor_binding__should_construct_singleton(self):
injector = Injector(lambda binder: binder.bind_to_constructor(int, random))
instance0 = injector.get_instance(int)
instance1 = injector.get_instance(int)
assert instance0 == instance1
def test_provider_binding__should_call_provider_for_each_injection(self):
injector = Injector(lambda binder: binder.bind_to_provider(int, random))
instance0 = injector.get_instance(int)
instance1 = injector.get_instance(int)
assert instance0 != instance1
def test_runtime_binding__should_create_runtime_singleton(self):
class MyClass(object):
pass
injector = Injector()
instance0 = injector.get_instance(MyClass)
instance1 = injector.get_instance(MyClass)
assert instance0 is instance1
assert isinstance(instance0, MyClass)
def test_runtime_binding__not_callable(self):
injector = Injector()
self.assertRaisesRegex(InjectorException,
'Cannot create a runtime binding, the key is not callable, key=123',
injector.get_instance, 123)
def test_runtime_binding__disabled(self):
injector = Injector(bind_in_runtime=False)
self.assertRaisesRegex(InjectorException,
"No binding was found for key=<.* 'int'>",
injector.get_instance, int)
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