The best way to fake uuid.v4

[hellboy81]

In SUT is v4 method uuid used:

uuid = require('uuid')
uuid.v4()
'b14b1abb-180e-4d34-a59c-940bc2e77ac7'

What is the best way fake their returning value in Arrange phase?

// How should we replace 'b14b1abb-180e-4d34-a59c-940bc2e77ac7'
// Can I simply use chance.guid?
uuid = {v4: sandbox.stub().named('uuid.v4').returns(...)}

[oliversalzburg]

Why would you stub a method that generates a UUIDv4 with a method that generates a UUIDv4 when you could just use the method itself?

[hellboy81]

OK, in which cases I SHOULD do it?

I should test if - char has been removed from random uuid:

// Code in SUT
uuid.v4().replace(/-/g, '')

As I mentioned I should stub uuid.v4() with string constant only? Usage of chance.guid is in this case unnecessary.

[oliversalzburg]

I'm sorry, but I don't think I understand the question :( Maybe someone else can help.

[leesei]

Are you comparing whether you should use uuid.v4() and chance.guid()? They provide the some kind of output and it's up to you to decide which one to use.

[jayarjo]

is chance.guid() guaranteed to produce unique result? Even if called in sequence in for loop? We have a case when it seemingly produces duplicates. It's intermittent, so we cannot reliably reproduce.

[oliversalzburg]

is chance.guid() guaranteed to produce unique result?

No. This is a library for fake data.