add some more docstrings

Author: mr-c

tests/test_check.py

@@ -1,3 +1,4 @@
+"""Confirm some known-bad CWL descriptions."""
 import pytest
 
 from cwltool.main import main

tests/test_context.py

@@ -7,6 +7,7 @@
 
 @windows_needs_docker
 def test_replace_default_stdout_stderr() -> None:
+    """Test our ability to replace the default stdout/err."""
     import sys
 
     # break stdout & stderr

tests/test_secrets.py

@@ -14,6 +14,7 @@
 
 @pytest.fixture
 def secrets() -> Tuple[SecretStore, CWLObjectType]:
+    """Fixture to return a secret store."""
     sec_store = SecretStore()
     job: CWLObjectType = {"foo": "bar", "baz": "quux"}
 
@@ -22,6 +23,7 @@ def secrets() -> Tuple[SecretStore, CWLObjectType]:
 
 
 def test_obscuring(secrets: Tuple[SecretStore, CWLObjectType]) -> None:
+    """Basic test of secret store."""
     storage, obscured = secrets
     assert obscured["foo"] != "bar"
     assert obscured["baz"] == "quux"