From 2ada67852174a76753080d65a7adbe27241a9caa Mon Sep 17 00:00:00 2001
From: Pieter Wuille <pieter.wuille@gmail.com>
Date: Tue, 23 May 2017 16:14:51 -0700
Subject: [PATCH] Use randbits instead of ad-hoc emulation in prevector tests

---
 src/test/prevector_tests.cpp | 34 ++++++++++++++++------------------
 1 file changed, 16 insertions(+), 18 deletions(-)

diff --git a/src/test/prevector_tests.cpp b/src/test/prevector_tests.cpp
index d951a6c3c2..674221e009 100644
--- a/src/test/prevector_tests.cpp
+++ b/src/test/prevector_tests.cpp
@@ -198,32 +198,31 @@ BOOST_AUTO_TEST_CASE(PrevectorTestInt)
     for (int j = 0; j < 64; j++) {
         prevector_tester<8, int> test;
         for (int i = 0; i < 2048; i++) {
-            int r = insecure_rand();
-            if ((r % 4) == 0) {
+            if (insecure_randbits(2) == 0) {
                 test.insert(insecure_randrange(test.size() + 1), insecure_rand());
             }
-            if (test.size() > 0 && ((r >> 2) % 4) == 1) {
+            if (test.size() > 0 && insecure_randbits(2) == 1) {
                 test.erase(insecure_randrange(test.size()));
             }
-            if (((r >> 4) % 8) == 2) {
+            if (insecure_randbits(3) == 2) {
                 int new_size = std::max<int>(0, std::min<int>(30, test.size() + (insecure_randrange(5)) - 2));
                 test.resize(new_size);
             }
-            if (((r >> 7) % 8) == 3) {
+            if (insecure_randbits(3) == 3) {
                 test.insert(insecure_randrange(test.size() + 1), 1 + insecure_randrange(2), insecure_rand());
             }
-            if (((r >> 10) % 8) == 4) {
+            if (insecure_randbits(3) == 4) {
                 int del = std::min<int>(test.size(), 1 + (insecure_randrange(2)));
                 int beg = insecure_randrange(test.size() + 1 - del);
                 test.erase(beg, beg + del);
             }
-            if (((r >> 13) % 16) == 5) {
+            if (insecure_randbits(4) == 5) {
                 test.push_back(insecure_rand());
             }
-            if (test.size() > 0 && ((r >> 17) % 16) == 6) {
+            if (test.size() > 0 && insecure_randbits(4) == 6) {
                 test.pop_back();
             }
-            if (((r >> 21) % 32) == 7) {
+            if (insecure_randbits(5) == 7) {
                 int values[4];
                 int num = 1 + (insecure_randrange(4));
                 for (int k = 0; k < num; k++) {
@@ -231,34 +230,33 @@ BOOST_AUTO_TEST_CASE(PrevectorTestInt)
                 }
                 test.insert_range(insecure_randrange(test.size() + 1), values, values + num);
             }
-            if (((r >> 26) % 32) == 8) {
+            if (insecure_randbits(5) == 8) {
                 int del = std::min<int>(test.size(), 1 + (insecure_randrange(4)));
                 int beg = insecure_randrange(test.size() + 1 - del);
                 test.erase(beg, beg + del);
             }
-            r = insecure_rand();
-            if (r % 32 == 9) {
+            if (insecure_randbits(5) == 9) {
                 test.reserve(insecure_randrange(32));
             }
-            if ((r >> 5) % 64 == 10) {
+            if (insecure_randbits(6) == 10) {
                 test.shrink_to_fit();
             }
             if (test.size() > 0) {
                 test.update(insecure_randrange(test.size()), insecure_rand());
             }
-            if (((r >> 11) % 1024) == 11) {
+            if (insecure_randbits(10) == 11) {
                 test.clear();
             }
-            if (((r >> 21) % 512) == 12) {
+            if (insecure_randbits(9) == 12) {
                 test.assign(insecure_randrange(32), insecure_rand());
             }
-            if (((r >> 15) % 8) == 3) {
+            if (insecure_randbits(3) == 3) {
                 test.swap();
             }
-            if (((r >> 15) % 16) == 8) {
+            if (insecure_randbits(4) == 8) {
                 test.copy();
             }
-            if (((r >> 15) % 32) == 18) {
+            if (insecure_randbits(5) == 18) {
                 test.move();
             }
         }