Tried running you code, it's failing:
--- FAIL: TestF (0.00s)
test.go:43: got ubuntu, want testing
FAIL
On Fri, Sep 20, 2019 at 4:07 PM Mhd Shulhan <m.shul...@gmail.com> wrote:
>
>
> > On 20 Sep 2019, at 17.21, Nitish Saboo <nitish.sabo...@gmail.com> 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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