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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,82 @@ | ||
package main | ||
|
||
import ( | ||
"bytes" | ||
"reflect" | ||
"testing" | ||
"time" | ||
) | ||
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func TestCountdown(t *testing.T) { | ||
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t.Run("prints 5 to Go!", func(t *testing.T) { | ||
buffer := &bytes.Buffer{} | ||
Countdown(buffer, &CountdownOperationsSpy{}) | ||
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got := buffer.String() | ||
want := `3 | ||
2 | ||
1 | ||
Go!` | ||
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if got != want { | ||
t.Errorf("got '%s' want '%s'", got, want) | ||
} | ||
}) | ||
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t.Run("sleep after every print", func(t *testing.T) { | ||
spySleepPrinter := &CountdownOperationsSpy{} | ||
Countdown(spySleepPrinter, spySleepPrinter) | ||
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want := []string{ | ||
sleep, | ||
write, | ||
sleep, | ||
write, | ||
sleep, | ||
write, | ||
sleep, | ||
write, | ||
} | ||
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if !reflect.DeepEqual(want, spySleepPrinter.Calls) { | ||
t.Errorf("wanted calls %v got %v", want, spySleepPrinter.Calls) | ||
} | ||
}) | ||
} | ||
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func TestConfigurableSleeper(t *testing.T) { | ||
sleepTime := 5 * time.Second | ||
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spyTime := &SpyTime{} | ||
sleeper := ConfigurableSleeper{sleepTime, spyTime.Sleep} | ||
sleeper.Sleep() | ||
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if spyTime.durationSlept != sleepTime { | ||
t.Errorf("should have slept for %v but slept for %v", sleepTime, spyTime.durationSlept) | ||
} | ||
} | ||
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type CountdownOperationsSpy struct { | ||
Calls []string | ||
} | ||
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func (s *CountdownOperationsSpy) Sleep() { | ||
s.Calls = append(s.Calls, sleep) | ||
} | ||
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func (s *CountdownOperationsSpy) Write(p []byte) (n int, err error) { | ||
s.Calls = append(s.Calls, write) | ||
return | ||
} | ||
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const write = "write" | ||
const sleep = "sleep" | ||
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type SpyTime struct { | ||
durationSlept time.Duration | ||
} | ||
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func (s *SpyTime) Sleep(duration time.Duration) { | ||
s.durationSlept = duration | ||
} |
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@@ -0,0 +1,44 @@ | ||
package main | ||
|
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import ( | ||
"fmt" | ||
"io" | ||
"os" | ||
"time" | ||
) | ||
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// Sleeper allows you to put delays | ||
type Sleeper interface { | ||
Sleep() | ||
} | ||
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// ConfigurableSleeper is an implementation of Sleeper with a defined delay | ||
type ConfigurableSleeper struct { | ||
duration time.Duration | ||
sleep func(time.Duration) | ||
} | ||
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// Sleep will pause execution for the defined Duration | ||
func (c *ConfigurableSleeper) Sleep() { | ||
c.sleep(c.duration) | ||
} | ||
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const finalWord = "Go!" | ||
const countdownStart = 3 | ||
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// Countdown prints a countdown from 5 to out with a delay between count provided by Sleeper | ||
func Countdown(out io.Writer, sleeper Sleeper) { | ||
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for i := countdownStart; i > 0; i-- { | ||
sleeper.Sleep() | ||
fmt.Fprintln(out, i) | ||
} | ||
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sleeper.Sleep() | ||
fmt.Fprint(out, finalWord) | ||
} | ||
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func main() { | ||
sleeper := &ConfigurableSleeper{1 * time.Second, time.Sleep} | ||
Countdown(os.Stdout, sleeper) | ||
} |