From 168f73c5f46d5f0dcba6074aacdfce159143094f Mon Sep 17 00:00:00 2001
From: Refael Ackermann <refack@gmail.com>
Date: Sat, 19 Aug 2017 17:57:36 -0400
Subject: [PATCH] test: improve assertion fail messages

PR-URL: https://github.com/nodejs/node/pull/14949
Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
---
 test/parallel/test-stream-inheritance.js | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/test/parallel/test-stream-inheritance.js b/test/parallel/test-stream-inheritance.js
index 77dc4804c1f986..2c6daed0385d4a 100644
--- a/test/parallel/test-stream-inheritance.js
+++ b/test/parallel/test-stream-inheritance.js
@@ -33,8 +33,14 @@ assert.ok(!(undefined instanceof Writable));
 
 // Simple inheritance check for `Writable` works fine in a subclass constructor.
 function CustomWritable() {
-  assert.ok(this instanceof Writable, 'inherits from Writable');
-  assert.ok(this instanceof CustomWritable, 'inherits from CustomWritable');
+  assert.ok(
+    this instanceof CustomWritable,
+    `${this} does not inherit from CustomWritable`
+  );
+  assert.ok(
+    this instanceof Writable,
+    `${this} does not inherit from Writable`
+  );
 }
 
 Object.setPrototypeOf(CustomWritable, Writable);
@@ -42,4 +48,4 @@ Object.setPrototypeOf(CustomWritable.prototype, Writable.prototype);
 
 new CustomWritable();
 
-assert.throws(CustomWritable, /AssertionError: inherits from Writable/);
+assert.throws(CustomWritable, /AssertionError: undefined does not inherit from CustomWritable/);