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test: improve assertion fail messages

PR-URL: #14949
Reviewed-By: Gibson Fahnestock <>
Reviewed-By: Benjamin Gruenbaum <>
Reviewed-By: Luigi Pinca <>
Reviewed-By: Colin Ihrig <>
Reviewed-By: James M Snell <>
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refack authored and MylesBorins committed Aug 19, 2017
1 parent 7546eef commit 168f73c5f46d5f0dcba6074aacdfce159143094f
Showing with 9 additions and 3 deletions.
  1. +9 −3 test/parallel/test-stream-inheritance.js
@@ -33,13 +33,19 @@ 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');
this instanceof CustomWritable,
`${this} does not inherit from CustomWritable`
this instanceof Writable,
`${this} does not inherit from Writable`
Object.setPrototypeOf(CustomWritable, Writable);
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/);

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