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test: improve assertion fail messages #14949

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test: improve assertion fail messages #14949

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21b1820
test: improve assertion fail messages
refack Aug 19, 2017
a17829d
[sqwsh] typo /s/inherits/inherit
refack Aug 19, 2017
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23 changes: 16 additions & 7 deletions test/parallel/test-stream-inheritance.js
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Original file line number Diff line number Diff line change
Expand Up @@ -33,17 +33,26 @@ 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,
`${this} does not inherits from CustomWritable`
);
assert.ok(
this instanceof Writable,
`${this} does not inherits from Writable`
);
}

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

new CustomWritable();

assert.throws(CustomWritable,
common.expectsError({
code: 'ERR_ASSERTION',
message: /^inherits from Writable$/
}));
common.expectsError(
CustomWritable,
{
code: 'ERR_ASSERTION',
type: assert.AssertionError,
message: 'undefined does not inherits from CustomWritable'
}
);