How to check object equality using should.js with a property value as NaN

Question

I believe this is a bug in should.js due to a special value NaN as NaN is not equal to itself.

({
    a: 1,
    c: 3,
    b: 2,
    d: NaN
}).should.eql({
    a: 1,
    c: 3,
    b: 2,
    d: NaN
});

This test case fails while it seems pretty obivious that it should pass.

Any suggestions on how to go about on this test case?

This is a known bug in should.js: https://github.com/visionmedia/should.js/issues/38 (or maybe this is not quite the same case... hm.) — apsillers, Sep 02 '13 at 23:15

score 2 · Answer 1 · answered Sep 02 '13 at 23:08

2

NaN is special in that it is not equal to itself.

> NaN == NaN
false

This is not a bug. NaN is not equal to anything. See MDN for more info.

answered Sep 02 '13 at 23:08

tckmn

1

I said that in my question. I didn't ask why. I asked what to do with the bug. – Joon Sep 02 '13 at 23:13
@Juno It's not a bug. – tckmn Sep 02 '13 at 23:15
1

should.js should be smart about it and check for NaN separately. This is a clearly a bug in should.js. – Joon Sep 02 '13 at 23:15
@Juno No, then by that logic this is a bug in JavaScript. `NaN !== NaN`. – tckmn Sep 02 '13 at 23:15
so if this is not a bug, how will you ever check equality of an object with NaN value in should.js? – Joon Sep 02 '13 at 23:16
@Juno Where are you getting these NaN values in the first place? – tckmn Sep 02 '13 at 23:18
I am adding them in my test cases – Joon Sep 02 '13 at 23:19
1

@Juno Why are you doing that? Don't. – tckmn Sep 02 '13 at 23:46

1 Answers1