Synchronous connection interface

For working from sync test cases, or for working from the console, it’d be useful to be able to acquire a synchronous interface onto a connection.

Eg.

database = Database(DATABASE_URL)

connection = database.sync_connection()
connection.execute(...)

Or…

@pytest.fixture
def connection():
    return database.sync_connection()

def test_something(client, database):
    client.post("/users", json=...)
    assert database.fetch_all(...) = ...

[tomchristie]

The other way around for us to approach this would be to provide an async test client.

Then we can just use pytest.mark.asyncio and use async test cases all the way through, with async requests and async database queries.

This https://github.com/encode/requests-async gets us a lot closer to doing that, since we’ve got a package that can either be used for making outgoing async HTTP requests, or for an async test client, or plugging into a stub service to mock out network requests. (eg. when you’re running the test suite, you probably want to stub out any external network requests that your service makes.)

[taybin]

@gvbgduh I’m using your draft for AsyncTestClient and so far, so good. I’d love to see it get merged into Starlette.