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// Copyright 2013 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 (
"crypto/rand"
"math/big"
"testing"
)
// http://golang.org/issue/6849.
func TestPrimeSmall(t *testing.T) {
for n := 2; n < 10; n++ {
p, err := rand.Prime(rand.Reader, n)
if err != nil {
t.Fatalf("Can't generate %d-bit prime: %v", n, err)
}
if p.BitLen() != n {
t.Fatalf("%v is not %d-bit", p, n)
}
if !p.ProbablyPrime(32) {
t.Fatalf("%v is not prime", p)
}
}
}
// Test that passing bits < 2 causes Prime to return nil, error
func TestPrimeBitsLt2(t *testing.T) {
if p, err := rand.Prime(rand.Reader, 1); p != nil || err == nil {
t.Errorf("Prime should return nil, error when called with bits < 2")
}
}
func TestInt(t *testing.T) {
// start at 128 so the case of (max.BitLen() % 8) == 0 is covered
for n := 128; n < 140; n++ {
b := new(big.Int).SetInt64(int64(n))
if i, err := rand.Int(rand.Reader, b); err != nil {
t.Fatalf("Can't generate random value: %v, %v", i, err)
}
}
}
func testIntPanics(t *testing.T, b *big.Int) {
defer func() {
if err := recover(); err == nil {
t.Errorf("Int should panic when called with max <= 0: %v", b)
}
}()
rand.Int(rand.Reader, b)
}
// Test that passing a new big.Int as max causes Int to panic
func TestIntEmptyMaxPanics(t *testing.T) {
b := new(big.Int)
testIntPanics(t, b)
}
// Test that passing a negative value as max causes Int to panic
func TestIntNegativeMaxPanics(t *testing.T) {
b := new(big.Int).SetInt64(int64(-1))
testIntPanics(t, b)
}
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