Temporarily improve error message to understand reason for test failure

Author: k-fish

packages/nextjs/test/integration/test/utils/client.js

@@ -99,7 +99,11 @@ const extractEnvelopeFromRequest = request => {
 
 const assertObjectMatches = (actual, expected) => {
   if (Object.prototype.toString.call(actual) !== Object.prototype.toString.call(expected)) {
-    throw new TypeError(`Types mismatch: ${actual} !== ${expected}`);
+    throw new TypeError(
+      `Types mismatch: ${actual} !== ${expected}. Actual (full): ${JSON.stringify(
+        actual ?? '',
+      )} Expected (full): ${JSON.stringify(expected)}`,
+    );
   }
 
   for (const key in expected) {