Google Cloud Functions tests

[martijnwalraven]

We recently merged a PR that adds support for Google Cloud Functions to Apollo Server.

It turns our the integration tests weren't actually being run because they weren't under a __tests__ directory. After changing that, the tests unfortunately all fail.

From what I can see, this is caused by apollo-server-integration-testsuite expecting request and response types to be of the underlying Node types and not Express types, as can be seen in the Lambda integration:

apollo-server/packages/apollo-server-lambda/src/__tests__/lambdaApollo.test.ts

Line 17 in a730108

return (req: IncomingMessage, res: ServerResponse) => {

@reaktivo: Would you be able to take another look at this? I assume things are actually working for you, but we also need the tests to pass to assure the integration behaves as expected.

@tgriesser: Since you added types in https://github.com/apollographql/apollo-server/pull/1554/files, maybe you also want to chime in?

[reaktivo]

I'll have a look later today, I tried yesterday and I was only able to see an error with the express adapter

[reaktivo]

@martijnwalraven Sorry for the delay, I've created a new PR to make the test actually run and also including some issues that were discovered by the integration tests

#1616