// Licensed to Elasticsearch B.V. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. licenses this file to you under
// the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

// This file contains commonly-used utility functions for testing.

package testutil

import (
	"flag"
	"math/rand"
	"testing"
	"time"
)

var (
	SeedFlag = flag.Int64("seed", 0, "Randomization seed")
)

func SeedPRNG(t *testing.T) {
	seed := *SeedFlag
	if seed == 0 {
		seed = time.Now().UnixNano()
	}

	t.Logf("reproduce test with `go test ... -seed %v`", seed)
	rand.Seed(seed)
}
