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test: improve assertion fail messages · nodejs/node@168f73c

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@@ -33,13 +33,19 @@ assert.ok(!(undefined instanceof Writable));

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// Simple inheritance check for `Writable` works fine in a subclass constructor.

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function CustomWritable() {

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assert.ok(this instanceof Writable, 'inherits from Writable');

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assert.ok(this instanceof CustomWritable, 'inherits from CustomWritable');

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assert.ok(

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this instanceof CustomWritable,

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`${this} does not inherit from CustomWritable`

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);

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assert.ok(

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this instanceof Writable,

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`${this} does not inherit from Writable`

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);

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}

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Object.setPrototypeOf(CustomWritable, Writable);

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Object.setPrototypeOf(CustomWritable.prototype, Writable.prototype);

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new CustomWritable();

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assert.throws(CustomWritable, /AssertionError: inherits from Writable/);

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assert.throws(CustomWritable, /AssertionError: undefined does not inherit from CustomWritable/);