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seed.go
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seed.go
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package testcase
import (
"fmt"
"go.llib.dev/testcase/random"
"math/rand"
"os"
"strconv"
"testing"
"time"
"go.llib.dev/testcase/internal"
)
func makeSeed() (int64, error) {
rawSeed, injectedRandomSeedIsSet := os.LookupEnv(EnvKeySeed)
if !injectedRandomSeedIsSet {
salt := rand.New(random.CryptoSeed{}).Int63()
base := time.Now().UnixNano()
return base + salt, nil
}
seed, err := strconv.ParseInt(rawSeed, 10, 64)
if err != nil {
return 0, fmt.Errorf("%s has invalid seed integer value: %s", EnvKeySeed, rawSeed)
}
return seed, nil
}
func seedForSpec(tb testing.TB) (_seed int64) {
tb.Helper()
if tb != (internal.SuiteNullTB{}) {
tb.Cleanup(func() {
tb.Helper()
if tb.Failed() {
// Help developers to know the seed of the failed test execution.
internal.Log(tb, fmt.Sprintf(`%s=%d`, EnvKeySeed, _seed))
}
})
}
seed, err := makeSeed()
if err != nil {
tb.Fatal(err.Error())
}
return seed
}