tests: don't always test the mocks

The mock file is pretty big, and due to that has a lot of tests
The mocks should not need to be edited often, only when the dependency
they are mocking is updated. This is currently never, as it is unmaintained.
This means that we don't need to run the tests for the mocks all the time.

If an upgrade of our dependencies is taken, then the test file should be ran.
However, it does not need to run every time the test suite is ran.
This should lead to a faster total test suite when running the suite.

Author: onerandomusername

pyproject.toml

@@ -63,13 +63,13 @@ build-backend = "poetry.core.masonry.api"
 
 [tool.coverage.run]
 branch = true
-source_pkgs = ['modmail', 'tests']
+source_pkgs = ['modmail', 'tests.modmail']
 omit = ["modmail/plugins/**.*"]
 
 [tool.pytest.ini_options]
 addopts = "--cov --cov-report="
 minversion = "6.0"
-testpaths = ["tests"]
+testpaths = ["tests/modmail"]
 
 [tool.black]
 line-length = 110
@@ -89,3 +89,4 @@ lint = { cmd = "pre-commit run --all-files", help = "Checks all files for CI err
 precommit = { cmd = "pre-commit install --install-hooks", help = "Installs the precommit hook" }
 report = { cmd = "coverage report", help = "Show coverage report from previously run tests." }
 test = { cmd = "pytest -n auto --dist loadfile", help = "Runs tests and save results to a coverage report" }
+test_mocks = { cmd = 'pytest tests/test_mocks.py', help = 'Runs the tests on the mock files. They are excluded from the main test suite.' }