Added application ids filter for easier partial deployment

tests/unit/filter_plugins/test_application_allowed.py

@@ -0,0 +1,46 @@
+import unittest
+from filter_plugins.application_allowed import application_allowed
+from ansible.errors import AnsibleFilterError
+
+
+class TestApplicationAllowed(unittest.TestCase):
+    def test_application_not_in_group(self):
+        # application not in group_names should always return False
+        self.assertFalse(application_allowed('app1', ['other_group'], None))
+        self.assertFalse(application_allowed('app1', ['other_group'], []))
+        self.assertFalse(application_allowed('app1', ['other_group'], ['app1']))
+
+    def test_no_allowed_applications_allows_group_items(self):
+        # allowed_applications is None or empty -> allow if in group
+        self.assertTrue(application_allowed('app1', ['app1', 'app2'], None))
+        # empty list treated as no filter -> allow all in group
+        self.assertTrue(application_allowed('app2', ['app1', 'app2'], []))
+
+    def test_allowed_applications_list(self):
+        group = ['app1', 'app2', 'app3']
+        allowed = ['app2', 'app3']
+        self.assertFalse(application_allowed('app1', group, allowed))
+        self.assertTrue(application_allowed('app2', group, allowed))
+        self.assertTrue(application_allowed('app3', group, allowed))
+
+    def test_allowed_applications_wrong_type(self):
+        # invalid allowed_applications type
+        with self.assertRaises(AnsibleFilterError):
+            application_allowed('app1', ['app1'], allowed_applications=123)
+
+    def test_group_names_wrong_type(self):
+        # invalid group_names type
+        with self.assertRaises(AnsibleFilterError):
+            application_allowed('app1', 'not_a_list', None)
+
+    def test_allowed_applications_edge_cases(self):
+        # whitespace-only entries do not affect result
+        group = ['app1']
+        allowed = ['app1', '  ', '']
+        self.assertTrue(application_allowed('app1', group, allowed))
+        # application in group but not listed -> false
+        self.assertFalse(application_allowed('app2', ['app2'], allowed))
+
+
+if __name__ == '__main__':
+    unittest.main()