diff --git a/awx/main/tests/unit/models/test_project.py b/awx/main/tests/unit/models/test_project.py
index ee4e86c08b..553e5b498a 100644
--- a/awx/main/tests/unit/models/test_project.py
+++ b/awx/main/tests/unit/models/test_project.py
@@ -12,3 +12,35 @@ def test_clean_credential_insights():
         proj.clean_credential()
 
     assert json.dumps(str(e.value)) == json.dumps(str([u'Insights Credential is required for an Insights Project.']))
+
+
+class TestProjectCacheId:
+    def test_cache_id_prefers_scm_revision(self):
+        proj = Project(scm_revision='a6e2e68042e58cccfda35614ef84537d39690fcd')
+        proj.current_job_id = 100
+        proj.last_job_id = 99
+        assert proj.cache_id == 'a6e2e68042e58cccfda35614ef84537d39690fcd'
+
+    def test_cache_id_falls_back_to_current_job_id(self):
+        proj = Project(scm_revision='')
+        proj.current_job_id = 100
+        proj.last_job_id = 99
+        assert proj.cache_id == '100'
+
+    def test_cache_id_falls_back_to_last_job_id(self):
+        proj = Project(scm_revision='')
+        proj.current_job_id = None
+        proj.last_job_id = 99
+        assert proj.cache_id == '99'
+
+    def test_cache_id_stable_across_different_last_job_ids(self):
+        """Simulates the multi-controller scenario: scm_revision stays the same
+        even when last_job_id changes due to a sync on another node."""
+        proj = Project(scm_revision='a6e2e68042e58cccfda35614ef84537d39690fcd')
+        proj.last_job_id = 100
+        cache_id_before = proj.cache_id
+
+        proj.last_job_id = 200
+        cache_id_after = proj.cache_id
+
+        assert cache_id_before == cache_id_after