On Thu, Aug 1, 2019, at 12:09, Nitish Saboo wrote:
> How can we mock a function in Go like os.Hostname() or os.Getwd()
> ? Any framework or Library that we can use for mocking the
> function calls ?
I don't like to think about "mocking" in Go, but I can't provide an
alternative term so maybe this is overly pedantic (or maybe one
isn't needed).
For something like this, I prefer to avoid global state like others have
suggested: eventually, you'll run a test in parallel, try to reuse that
state, etc and it will lead to race conditions. You may think you won't
now, but it's not a problem until it's a problem so you might as well
avoid it. Instead, I'd just pass in a hostname to use. If this isn't
something that makes sense in the public API, put it in an internal
function and test that:
// Foo is a public API that needs a hostname.
func Foo() {
hostname, err := os.Hostname()
// error handling
foo(hostname)
}
// test this
func foo(hostname string) {
// …
}
I also prefer to only test published methods using a _testing package,
and this flies in the face of that advice a bit but in a situation like
this I think it's by far the simplest solution that won't lead to
headaches later.
—Sam
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