Add a rand_util method for generating a random string.

We need this function to generate a nonce for MAC cookies.

Review URL: http://codereview.chromium.org/6904118

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@83588 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 18 insertions, 5 deletions

diff --git a/base/rand_util_unittest.cc b/base/rand_util_unittest.cc
index cbc338a..3bdb815 100644
--- a/base/rand_util_unittest.cc
+++ b/base/rand_util_unittest.cc
@@ -1,4 +1,4 @@
-// Copyright (c) 2008 The Chromium Authors. All rights reserved.
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
@@ -22,10 +22,23 @@ TEST(RandUtilTest, SameMinAndMax) {
 }
 
 TEST(RandUtilTest, RandDouble) {
- // Force 64-bit precision, making sure we're not in a 80-bit FPU register.
- volatile double number = base::RandDouble();
- EXPECT_GT(1.0, number);
- EXPECT_LE(0.0, number);
+  // Force 64-bit precision, making sure we're not in a 80-bit FPU register.
+  volatile double number = base::RandDouble();
+  EXPECT_GT(1.0, number);
+  EXPECT_LE(0.0, number);
+}
+
+TEST(RandUtilTest, RandBytesAsString) {
+  std::string random_string = base::RandBytesAsString(0);
+  EXPECT_EQ(0U, random_string.size());
+  random_string = base::RandBytesAsString(145);
+  EXPECT_EQ(145U, random_string.size());
+  char accumulator = 0;
+  for (size_t i = 0; i < random_string.size(); ++i)
+    accumulator |= random_string[i];
+  // In theory this test can fail, but it won't before the universe dies of
+  // heat death.
+  EXPECT_NE(0, accumulator);
 }
 
 // Make sure that it is still appropriate to use RandGenerator in conjunction