chore: add an errorMessage parameter to expectToFail() util

Author: Meligy

tests/e2e/utils/utils.ts

@@ -1,9 +1,12 @@
 
-export function expectToFail(fn: () => Promise<any>): Promise<void> {
+export function expectToFail(fn: () => Promise<any>, errorMessage?: string): Promise<void> {
   return fn()
     .then(() => {
-      throw new Error(`Function ${fn.source} was expected to fail, but succeeded.`);
-    }, () => {});
+      const functionSource = fn.name || (<any>fn).source || fn.toString();
+      const errorDetails = errorMessage ? `\n\tDetails:\n\t${errorMessage}` : '';
+      throw new Error(
+        `Function ${functionSource} was expected to fail, but succeeded.${errorDetails}`);
+    }, () => { });
 }
 
 export function isMobileTest() {