diff --git a/packages/internal-test-helpers/lib/ember-dev/assertion.ts b/packages/internal-test-helpers/lib/ember-dev/assertion.ts
index 2f8f188d565..d931654d383 100644
--- a/packages/internal-test-helpers/lib/ember-dev/assertion.ts
+++ b/packages/internal-test-helpers/lib/ember-dev/assertion.ts
@@ -43,21 +43,28 @@ export function setupAssertionHelpers(hooks: NestedHooks, env: DebugEnv) {
 
       // The try-catch statement is used to "exit" `func` as soon as
       // the first useful assertion has been produced.
+      let originalAssert = env.getDebugFunction('assert');
+
       try {
-        callWithStub(env, 'assert', func, (message, test) => {
+        // Edge has issues with the callWithStub function for some reason, so we
+        // have to do it manually here.
+        env.setDebugFunction('assert', (message, test) => {
           sawCall = true;
-          if (checkTest(test)) {
-            return;
+          if (!checkTest(test)) {
+            actualMessage = message;
+            throw BREAK;
           }
-          actualMessage = message;
-          throw BREAK;
         });
+        func();
       } catch (e) {
         if (e !== BREAK) {
+          env.setDebugFunction('assert', originalAssert);
           throw e;
         }
       }
 
+      env.setDebugFunction('assert', originalAssert);
+
       check(assert, sawCall, actualMessage, expectedMessage);
     };