fix: Dashboard API flaky test (#17611)

tests/integration_tests/dashboards/api_tests.py

@@ -413,29 +413,29 @@ def test_get_dashboards_changed_on(self):
         from datetime import datetime
         import humanize
 
-        admin = self.get_user("admin")
-        start_changed_on = datetime.now()
-        dashboard = self.insert_dashboard("title", "slug1", [admin.id])
-
-        self.login(username="admin")
-
-        arguments = {
-            "order_column": "changed_on_delta_humanized",
-            "order_direction": "desc",
-        }
-        uri = f"api/v1/dashboard/?q={prison.dumps(arguments)}"
-
-        rv = self.get_assert_metric(uri, "get_list")
-        self.assertEqual(rv.status_code, 200)
-        data = json.loads(rv.data.decode("utf-8"))
-        self.assertEqual(
-            data["result"][0]["changed_on_delta_humanized"],
-            humanize.naturaltime(datetime.now() - start_changed_on),
-        )
+        with freeze_time("2020-01-01T00:00:00Z"):
+            admin = self.get_user("admin")
+            dashboard = self.insert_dashboard("title", "slug1", [admin.id])
+
+            self.login(username="admin")
+
+            arguments = {
+                "order_column": "changed_on_delta_humanized",
+                "order_direction": "desc",
+            }
+            uri = f"api/v1/dashboard/?q={prison.dumps(arguments)}"
+
+            rv = self.get_assert_metric(uri, "get_list")
+            self.assertEqual(rv.status_code, 200)
+            data = json.loads(rv.data.decode("utf-8"))
+            self.assertEqual(
+                data["result"][0]["changed_on_delta_humanized"],
+                humanize.naturaltime(datetime.now()),
+            )
 
-        # rollback changes
-        db.session.delete(dashboard)
-        db.session.commit()
+            # rollback changes
+            db.session.delete(dashboard)
+            db.session.commit()
 
     def test_get_dashboards_filter(self):
         """