Adds test case for issue

plugins/module_utils/mongodb_common.py

@@ -291,8 +291,12 @@ def is_auth_enabled(module):
         connection_params = rename_ssl_option_for_pymongo4(connection_params)
     try:
         myclient = MongoClient(**connection_params)
-        myclient['admin'].command('listDatabases', 1.0)
-        auth_is_enabled = False
+        hello_response = myclient.admin.command('hello')
+        if 'arbiterOnly' in hello_response and hello_response['arbiterOnly']:
+            auth_is_enabled = False  # Arbiters cannot login with a user
+        else:
+            myclient['admin'].command('listDatabases', 1.0)
+            auth_is_enabled = False
     except Exception as excep:
         if hasattr(excep, 'code') and excep.code in [13]:
             auth_is_enabled = True

tests/integration/targets/mongodb_status/tasks/651_auth.yml

@@ -0,0 +1,65 @@
+# Tests for issue 651
+- vars:
+    mongo_parameters: &mongo_parameters
+      login_host: localhost
+      login_port: 3003 # Run on Arbiter
+      login_user: "{{ mongodb_admin_user }}"
+      login_password: "{{ mongodb_admin_password }}"
+      login_database: "admin"
+
+  block:
+
+    - set_fact:
+        mongodb_nodes:
+          - 3001
+          - 3002
+          - 3003
+
+    - set_fact:
+        mongod_auth: true
+
+    - set_fact:
+        current_replicaset: "issue_651"
+
+    - include_tasks: mongod_replicaset.yml      
+
+    - name: Create replicaset with module
+      community.mongodb.mongodb_replicaset:
+        login_host: localhost
+        login_port: 3001
+        replica_set: "{{ current_replicaset }}"
+        members:
+          - localhost:3001
+          - localhost:3002
+          - localhost:3003
+        arbiter_at_index: 2
+
+    - name: Add mongodb admin user - rs0
+      community.mongodb.mongodb_user:
+        login_host: localhost
+        login_port: 3001
+        replica_set: '{{ current_replicaset }}'
+        database: admin
+        name: '{{ mongodb_admin_user }}'
+        password: '{{ mongodb_admin_password }}'
+        roles:
+          - root
+        state: present
+      run_once: true
+
+    - name: Get replica_set status
+      community.mongodb.mongodb_status:
+        <<: *mongo_parameters
+        replica_set: "{{ current_replicaset }}"
+        #auth_mechanism: "SCRAM-SHA-256"  # Why is this here for no auth?
+        poll: 6
+        interval: 10
+      register: replset_status
+
+    - name: Validate expected number of PRIMARY, SECONDARY, ARBITER hosts
+      assert:
+        that:
+          - "{{ replset_status['replicaset'].values() | list | length == 3 }}"
+          - "{{ replset_status['replicaset'].values() | list | select('match', 'PRIMARY') | list  | length == 1 }}"
+          - "{{ replset_status['replicaset'].values() | list | select('match', 'SECONDARY') | list  | length == 1 }}"
+          - "{{ replset_status['replicaset'].values() | list | select('match', 'ARBITER') | list  | length == 1 }}"

tests/integration/targets/mongodb_status/tasks/651_noauth.yml

@@ -0,0 +1,50 @@
+# Tests for issue 651
+- vars:
+    mongo_parameters: &mongo_parameters
+      login_host: localhost
+      login_port: 3003 # Run on Arbiter
+      login_database: "admin"
+
+  block:
+
+    - set_fact:
+        mongodb_nodes:
+          - 3001
+          - 3002
+          - 3003
+
+    - set_fact:
+        mongod_auth: false
+
+    - set_fact:
+        current_replicaset: "issue_651"
+
+    - include_tasks: mongod_replicaset.yml      
+
+    - name: Create replicaset with module
+      community.mongodb.mongodb_replicaset:
+        login_host: localhost
+        login_port: 3001
+        replica_set: "{{ current_replicaset }}"
+        members:
+          - localhost:3001
+          - localhost:3002
+          - localhost:3003
+        arbiter_at_index: 2
+
+    - name: Get replica_set status
+      community.mongodb.mongodb_status:
+        <<: *mongo_parameters
+        replica_set: "{{ current_replicaset }}"
+        #auth_mechanism: "SCRAM-SHA-256"  # Why is this here for no auth?
+        poll: 6
+        interval: 10
+      register: replset_status
+
+    - name: Validate expected number of PRIMARY, SECONDARY, ARBITER hosts
+      assert:
+        that:
+          - "{{ replset_status['replicaset'].values() | list | length == 3 }}"
+          - "{{ replset_status['replicaset'].values() | list | select('match', 'PRIMARY') | list  | length == 1 }}"
+          - "{{ replset_status['replicaset'].values() | list | select('match', 'SECONDARY') | list  | length == 1 }}"
+          - "{{ replset_status['replicaset'].values() | list | select('match', 'ARBITER') | list  | length == 1 }}"

tests/integration/targets/mongodb_status/tasks/main.yml

@@ -431,3 +431,11 @@
 - include_tasks: mongod_teardown.yml
 
 - include_tasks: 302.yml
+
+- include_tasks: mongod_teardown.yml
+
+- include_tasks: 651_noauth.yml
+
+- include_tasks: mongod_teardown.yml
+
+- include_tasks: 651_auth.yml