> On 20 Sep 2019, at 17.21, Nitish Saboo <[email protected]> wrote:
>
> I have a function in Go that I want to unit test but that function contains
> os.Hostname().Hence i thought of mocking os.Hostname.
>
> Example:
>
> func F(){
> hostname, _ := os.Hostname()
> }
>
> I tried something like this:
>
> var osHostname = os.Hostname
>
> func TestF(t *testing.T) {
> expected := "testing"
> defer func() { osHostname = os.Hostname }()
> osHostname = func()(string, error) { return "testing", nil }
> actual := F()
> assert.Equal(t,expected,actual)
> }
>
> But this doesn't work.Can someone please point me in the right direction?
I have two notes about your code.
First, F() should have return values but its not.
Second, F() should use osHostname not os.Hostname.
The following pseudocode should works,
```
var osHostname = os.Hostname
func F() (string, error) {
return osHostname()
}
func TestF(t *testing.T) {
orgGetHostname := osHostname
osHostname = func() (string, error) {
return "testing", nil
}
defer func() {
osHostname = orgGetHostname
}()
exp := "testing"
got, _ := F()
if exp != got {
t.Fatalf("got %s, want %s", got, exp)
}
}
```
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