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// Copyright 2022 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package rand_test
import (
. "math/rand"
"testing"
)
// This test is first, in its own file with an alphabetically early name,
// to try to make sure that it runs early. It has the best chance of
// detecting deterministic seeding if it's the first test that runs.
func TestAuto(t *testing.T) {
// Pull out 10 int64s from the global source
// and then check that they don't appear in that
// order in the deterministic Seed(1) result.
var out []int64
for i := 0; i < 10; i++ {
out = append(out, Int63())
}
// Look for out in Seed(1)'s output.
// Strictly speaking, we should look for them in order,
// but this is good enough and not significantly more
// likely to have a false positive.
Seed(1)
found := 0
for i := 0; i < 1000; i++ {
x := Int63()
if x == out[found] {
found++
if found == len(out) {
t.Fatalf("found unseeded output in Seed(1) output")
}
}
}
}
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