Document skill unit tests

README.md

@@ -36,3 +36,27 @@ To test that skill intents match as expected for all supported languages,
     the skill's root directory 
 > - <test-file\> is a relative or absolute path to the resource test file, usually `test_intents.yaml`
 > - The `--padacioso` flag can be added to test with Padacioso instead of Padatious for relevant intents
+
+## Advanced Usage
+In addition to convenient CLI methods, this package also provides test cases that
+may be extended.
+
+### Skill Unit Tests
+`neon_minerva.tests.skill_unit_test_base` provides `SkillTestCase`, a class
+that supplies boilerplate setup/teardown/mocking for testing a skill. An example
+skill test implementation could look like:
+
+```python
+from os import environ
+from neon_minerva.tests.skill_unit_test_base import SkillTestCase
+
+environ['TEST_SKILL_ENTRYPOINT'] = "my_skill.test"
+
+class MySkillTest(SkillTestCase):
+    def test_skill_init(self):
+        self.assertEqual(self.skill.skill_id, "my_skill.test")
+    ...
+```
+
+Be sure to review the base class for mocked methods and test paths as these may
+change in the future.