`go test -count n -timeout t`

go testの引数についてのメモ

• -count n: テストをn(int)回実行する
• -timeout t: 1回毎ではなく，n回全体についてのタイムアウトをt(time.Duration)に設定する．

TestFooBar 1回分が1秒以内に終わって欲しい場合，

• go test -count 1 -timeout 1s -v TestFooBar
• go test -count 100 -timeout 100s -v TestFooBar
• go test -count 100 -timeout 1s -v TestFooBar

となる．

例

package main

import (
        "testing"
        "time"
)

func TestFooBar(t *testing.T) {
        t.Logf("enter %s", time.Now())
        epsilon := 100 * time.Millisecond
        <-time.After(1 * time.Second - epsilon)
        t.Logf("leave %s", time.Now())
}

$ go test -v -count 1 -timeout 1s -run TestFooBar
=== RUN   TestFooBar
--- PASS: TestFooBar (0.90s)
        main_test.go:9: enter 2016-02-24 12:06:40.528802812 +0900 JST
        main_test.go:12: leave 2016-02-24 12:06:41.429077271 +0900 JST
PASS
ok      _/home/suda/WORK/testfoobar     0.902s

$ go test -v -count 100 -timeout 1s -run TestFooBar
=== RUN   TestFooBar
--- PASS: TestFooBar (0.90s)
        main_test.go:9: enter 2016-02-24 12:07:14.381237659 +0900 JST
        main_test.go:12: leave 2016-02-24 12:07:15.281427292 +0900 JST
=== RUN   TestFooBar
panic: test timed out after 1s

goroutine 8 [running]:
panic(0x51b300, 0xc8200107b0)
        /home/suda/go/src/runtime/panic.go:464 +0x3e6
testing.startAlarm.func1()
        /home/suda/go/src/testing/testing.go:725 +0x14b
created by time.goFunc
        /home/suda/go/src/time/sleep.go:129 +0x3a

goroutine 1 [chan receive]:
testing.RunTests(0x5c2380, 0x645df0, 0x1, 0x1, 0x1)
        /home/suda/go/src/testing/testing.go:583 +0x8d2
testing.(*M).Run(0xc820041ef8, 0xc820010588)
        /home/suda/go/src/testing/testing.go:515 +0x81
main.main()
        _/home/suda/WORK/testfoobar/_test/_testmain.go:54 +0x117

goroutine 7 [chan receive]:
_/home/suda/WORK/testfoobar.TestFooBar(0xc8200aa090)
        /home/suda/WORK/testfoobar/main_test.go:11 +0x153
testing.tRunner(0xc8200aa090, 0x645df0)
        /home/suda/go/src/testing/testing.go:473 +0x98
created by testing.RunTests
        /home/suda/go/src/testing/testing.go:582 +0x892
exit status 2
FAIL    _/home/suda/WORK/testfoobar     1.004s