diff --git a/modules/renderer/map.js b/modules/renderer/map.js
index 0e5a7127c..a288aef41 100644
--- a/modules/renderer/map.js
+++ b/modules/renderer/map.js
@@ -653,6 +653,9 @@ export function rendererMap(context) {
 
 
     function redraw(difference, extent) {
+        // in unit tests, we need to abort if the test has already completed
+        if (typeof window === 'undefined') return;
+
         if (surface.empty() || !_redrawEnabled) return;
 
         // If we are in the middle of a zoom/pan, we can't do differenced redraws.
diff --git a/modules/util/session_mutex.js b/modules/util/session_mutex.js
index 99fdc94d9..42b61edca 100644
--- a/modules/util/session_mutex.js
+++ b/modules/util/session_mutex.js
@@ -8,6 +8,9 @@ export function utilSessionMutex(name) {
     var intervalID;
 
     function renew() {
+        // in unit tests, we need to abort if the test has already completed
+        if (typeof window === 'undefined') return;
+
         var expires = new Date();
         expires.setSeconds(expires.getSeconds() + 5);
         document.cookie = name + '=1; expires=' + expires.toUTCString() + '; sameSite=strict';
diff --git a/package.json b/package.json
index 13f4cf024..b9e01621d 100644
--- a/package.json
+++ b/package.json
@@ -40,7 +40,7 @@
     "start:watch": "run-p build:js:watch start:server",
     "start:server": "node scripts/server.js",
     "test": "npm-run-all -s lint build test:spec",
-    "test:spec": "vitest",
+    "test:spec": "vitest --no-isolate",
     "translations": "node scripts/update_locales.js"
   },
   "dependencies": {
diff --git a/test/spec/services/panoramax.js b/test/spec/services/panoramax.js
index e41850904..c69575451 100644
--- a/test/spec/services/panoramax.js
+++ b/test/spec/services/panoramax.js
@@ -21,6 +21,9 @@ describe('iD.servicePanoramax', function() {
         panoramax = iD.services.panoramax;
         panoramax.reset();
         fetchMock.reset();
+
+        // never resolve
+        fetchMock.mock(/api\.panoramax\.xyz/, new Promise(() => {}));
     });
 
     afterEach(function() {