If I were you, I'd pass in an interface value to functionA with the
signature
type Ber interface{
functionB(io.Reader, io.Writer)
}
(assuming that zipReader is an io.Reader, zipWriter is an io.Writer, you
may have to adjust this a bit).
Then make your mock functionB a method on a type that implements the Ber
interface, the same for the real functionB. In unit tests, pass in an
instance of the type with the mock method, in real life, pass in an
instance of the type with the real method.
Note that the types could be as simple as
type mockB struct{}
func (m mockB) functionB(...)
On 10.09.20 09:15, Yvonne Zhang wrote:
Hi,
I have a function streaming a zipreader to browser. It is like this.
func functionA(....)(body io.ReadCloser, err error){
// some logic to get a zipreader
body, pipeWriter := io.Pipe()
zipWriter := zip.NewWriter(pipeWriter)
go func(){
// err := functionB(zipReader, zipWriter)call another function to
prepare files and write to zipwriter
If err != nil{
zipWriter.Close()
_ = pipeWriter.CloseWithError(err)
return
}
zipWriter.Close()
pipeWriter.Close()
}()
return
}
My question is about unit test about this functionA. I have mock for
functionB. How do I write unit test for functionA with the mock
functionB. It seems my unit test does not work well when it goes into
the goroutine.
Many thanks!
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