Update intergration tests to use WebAppliationFactory

[ttu]

https://docs.microsoft.com/en-us/aspnet/core/testing/integration-testing

[kashifsoofi]

Limitation, that need changes in TestHost is currently (at the time of comment) there is no way to create a client with HttpHandler with Auto Redirect set to false using TestHost.

[ttu]

@kashifsoofi Hi. Sorry that haven't updated the Issue, but Microsoft changed practices how integration tests should be done.

Now WebAppliationFactory should be used instead of TestServer. I think this changed at some point in the end of the last year.

With WebAppliationFactory AlowAutoRedirect can set to false (https://docs.microsoft.com/en-us/aspnet/core/test/integration-tests?view=aspnetcore-2.2#test-a-secure-endpoint).

If you still want to finish this issue I can mark this as in progress, but I understand if you don't want to continue with this anymore.

If you have some questions about this, just let me know. I should have some sample code how test values can be injected to test server with WebAppliationFactory.

[kashifsoofi]

Thanks @ttu for the comment, almost done with the update only test now left to do is web sockets.

[ttu]

Implemented in #54