Test acquire_token_silent() for confidential client

Author: rayluo

tests/test_e2e.py

@@ -133,6 +133,11 @@ def assertCacheWorksForApp(self, result_from_wire, scope):
         self.assertEqual(
             result_from_wire['access_token'], result_from_cache['access_token'],
             "We should get a cached AT")
+        self.app.acquire_token_silent(
+            # Result will typically be None, because client credential grant returns no RT.
+            # But we care more on this call should succeed without exception.
+            scope, account=None,
+            force_refresh=True)  # Mimic the AT already expires
 
     def _test_username_password(self,
             authority=None, client_id=None, username=None, password=None, scope=None,
@@ -618,11 +623,12 @@ def _test_acquire_token_by_client_secret(
             self, client_id=None, client_secret=None, authority=None, scope=None,
             **ignored):
         assert client_id and client_secret and authority and scope
-        app = msal.ConfidentialClientApplication(
+        self.app = msal.ConfidentialClientApplication(
             client_id, client_credential=client_secret, authority=authority,
             http_client=MinimalHttpClient())
-        result = app.acquire_token_for_client(scope)
+        result = self.app.acquire_token_for_client(scope)
         self.assertIsNotNone(result.get("access_token"), "Got %s instead" % result)
+        self.assertCacheWorksForApp(result, scope)
 
 
 class WorldWideTestCase(LabBasedTestCase):