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|
package main
import (
"bytes"
"testing"
)
type SpySleeper struct {
Calls int
}
func (s *SpySleeper) Sleep() {
s.Calls++
}
func TestCountdown(t *testing.T) {
buffer := &bytes.Buffer{}
spySleeper := &SpySleeper{}
Countdown(buffer, spySleeper)
got := buffer.String()
want := `3
2
1
Go!`
if got != want {
t.Errorf("got %q want %q", got, want)
}
if spySleeper.Calls != 4 {
t.Errorf("not enough calls to sleeper, want 4 got %d", spySleeper.Calls)
}
}
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