actual := Perm(i)
		expected := rand.Perm(i)
		for j := 0; j < i; j++ {
			if actual[j] != expected[j] {
				t.Errorf("Perm call result is unexpected")
			}
		}
	}
}

func TestIntnRange(t *testing.T) {
	// 0 is invalid.
	for min, max := range map[int]int{1: 2, 10: 123, 100: 500} {
		for i := 0; i < maxRangeTestCount; i++ {
			inrange := IntnRange(min, max)
			if inrange < min || inrange >= max {