Add initial tests for test module

tests/test_test.py

@@ -0,0 +1,40 @@
+"""tests/test_test.py.
+
+Test to ensure basic test functionality works as expected.
+
+Copyright (C) 2019 Timothy Edmund Crosley
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
+documentation files (the "Software"), to deal in the Software without restriction, including without limitation
+the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and
+to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or
+substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
+CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+"""
+import pytest
+
+import hug
+
+api = hug.API(__name__)
+
+
+def test_cli():
+    """Test to ensure the CLI tester works as intended to allow testing CLI endpoints"""
+    @hug.cli()
+    def my_cli_function():
+        return 'Hello'
+
+    assert hug.test.cli(my_cli_function) == 'Hello'
+    assert hug.test.cli('my_cli_function', api=api) == 'Hello'
+
+    # Shouldn't be able to specify both api and module.
+    with pytest.raises(ValueError):
+        assert hug.test.cli('my_method', api=api, module=hug)