nodejs
diff --git a/Collapse file
‎lib/assert.js‎
Copy file name to clipboardExpand all lines: lib/assert.js
+10-3Lines changed: 10 additions & 3 deletions b/Collapse file
‎lib/assert.js‎
Copy file name to clipboardExpand all lines: lib/assert.js
+10-3Lines changed: 10 additions & 3 deletions
@@ -578,14 +578,21 @@ function expectedException(actual, expected, message, fn) {
       if (expected.test(str))
         return;
 
-      throw new AssertionError({
+      if (!message) {
+        generatedMessage = true;
+        message = 'The input did not match the regular expression ' +
+                  `${inspect(expected)}. Input:\n\n${inspect(str)}\n`;
+      }
+
+      const err = new AssertionError({
         actual,
         expected,
-        message: message || 'The input did not match the regular expression ' +
-                            `${inspect(expected)}. Input:\n\n${inspect(str)}\n`,
+        message,
         operator: fn.name,
         stackStartFn: fn
       });
+      err.generatedMessage = generatedMessage;
+      throw err;
     }
 
     // Handle primitives properly.