fix test

awx/main/tests/data/inventory/plugins/tower/env.json

@@ -3,5 +3,6 @@
     "TOWER_HOST": "https://foo.invalid",
     "TOWER_PASSWORD": "fooo",
     "TOWER_USERNAME": "fooo",
+    "TOWER_OAUTH_TOKEN": "",
     "TOWER_VERIFY_SSL": "False"
 }

awx/main/tests/functional/test_inventory_source_injectors.py

@@ -124,6 +124,9 @@ def fake_credential_factory():
         for var in var_specs.keys():
             inputs[var] = generate_fake_var(var_specs[var])
 
+        if source == 'tower':
+            inputs.pop('oauth_token')  # mutually exclusive with user/pass
+
         return Credential.objects.create(
             credential_type=ct,
             inputs=inputs