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package praefect
import (
"sync"
"testing"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
// TestNewLockedRandom tests that n is correctly passed down to the random
// implementation and that the return value is correctly passed back. To test
// that access to the random is actually synchronized, we launch 50 goroutines
// to call the random func concurrently to increment actual. If the calls to
// random are not correctly synchronized, actual might be not match expected
// at the end and the race detector should detect racy accesses even in the
// cases where the values match.
func TestNewLockedRandom(t *testing.T) {
expected := 50
actual := 0
random := NewLockedRandom(mockRandom{
intnFunc: func(n int) int {
assert.Equal(t, 1, n)
actual++
return 2
},
})
var wg sync.WaitGroup
wg.Add(expected)
for i := 0; i < expected; i++ {
go func() {
defer wg.Done()
assert.Equal(t, 2, random.Intn(1))
}()
}
wg.Wait()
require.Equal(t, expected, actual)
}
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