Stuck on an issue?

Lightrun Answers was designed to reduce the constant googling that comes with debugging 3rd party libraries. It collects links to all the places you might be looking at while hunting down a tough bug.

And, if you’re still stuck at the end, we’re happy to hop on a call to see how we can help out.

expect(Buffer).to.be.a('Buffer') incorrectly fails

See original GitHub issue

As on tin, but best explained by example:

Test case:

	it('should be a buffer', () => {
		let buf = Buffer.alloc(0)

		expect(buf).to.be.a('buffer')
	})

result:

     AssertionError: expected <Buffer > to be a buffer

env is a linux system, with the following:

$ node -v
v8.4.0
$ npm ls | grep chai
├─┬ chai@4.1.1

Issue Analytics

State:
Created 6 years ago
Comments:5 (4 by maintainers)

Top GitHub Comments

18reactions

vieiralucascommented, Sep 11, 2017

@damianb btw you can workaround this by using the instanceof assertion

const buf = Buffer.alloc(0)
expect(buf).to.be.instanceof(Buffer)

1reaction

damianbcommented, Sep 11, 2017

@vieiralucas Thanks - ended up picking out that workaround myself after a little head scratching.

Figured it was worth still having the issue open, however - not sure if it merits further looking at, but that’s your team’s call.

Top Results From Across the Web

how to clean up the previous expect_buf in an expect script

I've determined empirically that unsetting the expect_out(buffer) is much more consistent than "expect *". This post was of great help for me.

What is a Buffer Overflow | Attack Types and Prevention Methods

Attackers exploit buffer overflow issues to change execution paths, triggering responses that can damage the applications and exposes private information.

Buffer Solutions - Cal State LA

Buffer Solutions ν Let's go back to problem of adding HCl to buffer solution: ν We can use H-H eqn. to make the...

Buffer Overflow Vulnerabilities, Exploits & Attacks - Veracode

Common application development mistakes that can lead to buffer overflow include failing to allocate large enough buffers and neglecting to check for overflow ......

Buffers

A buffer system can be made by mixing a soluble compound that contains the conjugate ... Although this step is not truly necessary...