func TestGetID_Success(t *testing.T) {
assert := assert.New(t)
links := api.Links{api.Link{Rel: "a", ID: "1"}}
ok, id := links.GetID("a")
assert.True(ok)
assert.Equal(id, "1")
}
func TestGetID_Failure(t *testing.T) {
assert := assert.New(t)
links := api.Links{api.Link{Rel: "a", ID: "1"}}
ok, id := links.GetID("b")
assert.False(ok)
assert.Equal(id, "")
}