On Wednesday, 3 November 2021 at 21:51:49 UTC axel.wa...@googlemail.com
wrote:
> On Wed, Nov 3, 2021 at 10:44 PM Matt Mueller <mattm...@gmail.com> wrote:
>
>> Hey, thanks. I'm aware of this approach.
>>
>> I'm hoping for some technique that automatically injects, since it can be
>> cumbersome to inject all your dependencies by hand.
>>
>
> I don't understand what you mean. Obviously, how to connect to a database
> or other dependencies is highly application specific. So you'd still have
> to write both the code to create the connections and somehow mention what
> dependencies you need in the test.
>
Perhaps he's thinking of something like pytest. Simply by adding a named
argument to your test function, a corresponding helper is called to create
the value. There is a 'yield' variation so that the helper can also handle
cleanup after the test; and helpers can invoke other helpers in the same
way.
@pytest.yield_fixture(scope='function')
def session():
db_session = make_session()
yield db_session
db_session.close()
@pytest.fixture(scope='function')
def customer(session):
c = Customer(name="Fred")
session.add(c)
return c
# The actual tests
def test_foo(session, customer):
assert session is not None
assert customer is not None
def test_bar(session, customer):
... another test
It reduces the boilerplate somewhat - in go, each test would be something
like
func test_foo() {
session := make_session()
defer session.close()
customer := make_customer(session)
... rest of test
}
which is actually not unreasonable IMO.
pytest also lets you have objects with longer lifetimes (scopes), so that
multiple tests within the same package or session can share the same object.
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