Does the eventually matcher support this usage?

[myzhan]

I write a testcase like this, and expect it to pass. But it's not.

a := false
go func() {
    a = true
}()
Eventually(a).Should(BeTrue())

Until I rewrite it like this.

a := int32(0)
go func() {
    atomic.StoreInt32(&callbackCalled, 1)
}()
Eventually(func() int32 { return atomic.LoadInt32(&a) }).Should(BeEquivalentTo(1))

[onsi]

in the first example you are passing a by value so a copy of its contents is made. in the second example the function closure captures a. you could replace a with a pointer in the first example but you shouldn’t do that as it will trigger the race detector. your second example is the way to go (alternatively you can use channels)

[myzhan]

Ah, now I see, thanks.