validate-modules --arg-spec (#21331)

* validate-modules --arg-spec

* Update developing_modules_documenting.rst

* Never mock out ansible or ansible.module_utils

* No more false positives

docs/docsite/rst/dev_guide/developing_modules_documenting.rst

@@ -41,6 +41,7 @@ The following fields can be used and are all required unless specified otherwise
   * As the short description is displayed by ``ansible-doc -l`` without the category grouping it needs enough detail to explain its purpose without the context of the directory structure in which it lives.
   * Unlike ``description:`` this field should not have a trailing full stop.
 * ``description:``
+
   * A detailed description (generally two or more sentences).
   * Must be written in full sentences, i.e. with capital letters and fullstops.
   * Shouldn't mention the name module.
@@ -173,6 +174,14 @@ Put your completed module file into the ``lib/ansible/modules/$CATEGORY/`` direc
 run the command: ``make webdocs``. The new 'modules.html' file will be
 built in the ``docs/docsite/_build/html/$MODULENAME_module.html`` directory.
 
+To test your documentation against your ``argument_spec`` you can use ``validate-modules``. Note that this option isn't currently enabled in Shippable due to the time it takes to run.
+
+.. code-block:: shell-session
+
+   # If you don't already, ensure you are using your local checkout
+   $ source hacking/env-setup
+   $ ./test/sanity/validate-modules/validate-modules --arg-spec --warnings  lib/ansible/modules/your/modules/
+
 .. tip::
 
    If you're having a problem with the syntax of your YAML you can

test/sanity/validate-modules/module_args.py

@@ -71,6 +71,10 @@ def add_mocks(filename):
             parts = module.split('.')
             for i in range(len(parts)):
                 dotted = '.'.join(parts[:i+1])
+                # Never mock out ansible or ansible.module_utils
+                # we may get here if a specific module_utils file needed mocked
+                if dotted in ('ansible', 'ansible.module_utils',):
+                    continue
                 sys.modules[dotted] = sys_mock
                 sys_mocks.append(dotted)