rand: fix warnings

vlib/crypto/rand/rand_test.v

@@ -1,44 +0,0 @@
-// Copyright (c) 2019-2020 Alexander Medvednikov. All rights reserved.
-// Use of this source code is governed by an MIT license
-// that can be found in the LICENSE file.
-import crypto.rand
-
-fn get_random_bytes(no_bytes int) []byte {
-	r := rand.read(no_bytes) or {
-		assert false
-		return []
-	}
-	assert r.len == no_bytes
-	return r
-}
-
-fn test_crypto_rand_read() {
-	no_bytes := 100
-	r1 := get_random_bytes(no_bytes)
-	r2 := get_random_bytes(no_bytes)
-	mut equals := 0
-	for i in 0 .. r1.len {
-		if r1[i] == r2[i] {
-			equals++
-		}
-	}
-	assert (100.0 * f32(equals) / f32(no_bytes)) < 20.0
-}
-
-fn test_crypto_rand_int_u64() {
-	max := u64(160)
-	mut unique := []u64{}
-	for _ in 0 .. 80 {
-		r := rand.int_u64(max) or {
-			assert false
-			return
-		}
-		if r >= max {
-			assert false
-		}
-		if r !in unique {
-			unique << r
-		}
-	}
-	assert unique.len >= 10
-}