Tests: Network requests should be mocked

[rolson]

The tests for the toolkit are running very slowly. Even with some test disabled, they are taking me over 500 seconds to run:

Test Suite 'ArcGISToolkitTests.xctest' failed at 2022-07-13 15:18:30.653.
	 Executed 37 tests, with 1 failure (1 unexpected) in 507.281 (507.302) seconds
Test Suite 'Selected tests' failed at 2022-07-13 15:18:30.654.
	 Executed 37 tests, with 1 failure (1 unexpected) in 507.281 (507.303) seconds

Ideally these tests would take less than a few seconds as they are unit tests. The fact that they take so long will discourage developers from running them and the tests will fall into disrepair.

[dfeinzimer]

@rolson, Mockingbird is used on the SDK, correct? Would we be able to use it in the toolkit as well?

[rolson]

As it is, no, because it's not public.

[dfeinzimer]

@rolson Would it be okay if I close this out as a duplicate of #6?

[rolson]

Oh sure, thanks