[AAP-44277] License module now validates API responses for subscription IDs. (Moved from Tower) (#16096)

* resolve bug and add simple unit tests

* Update awx_collection/plugins/modules/license.py

Co-authored-by: Andrew Potozniak <tyraziel@gmail.com>

---------

Co-authored-by: Andrew Potozniak <tyraziel@gmail.com>

awx_collection/test/awx/test_license_subscription.py

@@ -0,0 +1,32 @@
+from __future__ import absolute_import, division, print_function
+
+__metaclass__ = type
+
+import pytest
+
+
+@pytest.mark.django_db
+def test_license_invalid_subscription_id_should_fail(run_module, admin_user):
+    """Test invalid subscription ID returns failure."""
+    result = run_module('license', {'subscription_id': 'invalid-test-12345', 'state': 'present'}, admin_user)
+
+    assert result.get('failed', False)
+    assert 'msg' in result
+    assert 'subscription' in result['msg'].lower()
+
+
+@pytest.mark.django_db
+def test_license_invalid_manifest_should_fail(run_module, admin_user):
+    """Test invalid manifest returns failure."""
+    result = run_module('license', {'manifest': '/nonexistent/test.zip', 'state': 'present'}, admin_user)
+
+    assert result.get('failed', False)
+    assert 'msg' in result
+
+
+@pytest.mark.django_db
+def test_license_state_absent_works(run_module, admin_user):
+    """Test license removal works."""
+    result = run_module('license', {'state': 'absent'}, admin_user)
+
+    assert not result.get('failed', False)