diff options
Diffstat (limited to 'src/testing')
| -rw-r--r-- | src/testing/testing.go | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/src/testing/testing.go b/src/testing/testing.go index 1562eadef0..85a7fec65f 100644 --- a/src/testing/testing.go +++ b/src/testing/testing.go @@ -242,6 +242,7 @@ import ( "fmt" "internal/race" "io" + "math/rand" "os" "runtime" "runtime/debug" @@ -299,6 +300,7 @@ func Init() { cpuListStr = flag.String("test.cpu", "", "comma-separated `list` of cpu counts to run each test with") parallel = flag.Int("test.parallel", runtime.GOMAXPROCS(0), "run at most `n` tests in parallel") testlog = flag.String("test.testlogfile", "", "write test action log to `file` (for use only by cmd/go)") + shuffle = flag.String("test.shuffle", "off", "randomize the execution order of tests and benchmarks") initBenchmarkFlags() } @@ -325,6 +327,7 @@ var ( timeout *time.Duration cpuListStr *string parallel *int + shuffle *string testlog *string haveExamples bool // are there examples? @@ -1456,6 +1459,25 @@ func (m *M) Run() (code int) { return } + if *shuffle != "off" { + var n int64 + var err error + if *shuffle == "on" { + n = time.Now().UnixNano() + } else { + n, err = strconv.ParseInt(*shuffle, 10, 64) + if err != nil { + fmt.Fprintln(os.Stderr, `testing: -shuffle should be "off", "on", or a valid integer:`, err) + m.exitCode = 2 + return + } + } + fmt.Println("-test.shuffle", n) + rng := rand.New(rand.NewSource(n)) + rng.Shuffle(len(m.tests), func(i, j int) { m.tests[i], m.tests[j] = m.tests[j], m.tests[i] }) + rng.Shuffle(len(m.benchmarks), func(i, j int) { m.benchmarks[i], m.benchmarks[j] = m.benchmarks[j], m.benchmarks[i] }) + } + parseCpuList() m.before() |