Reland "Move webrtc/{base => rtc_base}" (https://codereview.webrtc.org/2877023002)

Reland the base->rtc_base without adding stub headers (will be
done in follow-up CL). This preserves git blame history of all files.

BUG=webrtc:7634
NOTRY=True
TBR=kwiberg@webrtc.org

Change-Id: Iea3bb6f3f67b8374c96337b63e8f5aa3e6181012
Reviewed-on: https://chromium-review.googlesource.com/554611
Reviewed-by: Henrik Kjellander <kjellander@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#18821}

webrtc/rtc_base/helpers_unittest.cc

@@ -0,0 +1,111 @@
+/*
+ *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include <string>
+
+#include "webrtc/base/buffer.h"
+#include "webrtc/base/gunit.h"
+#include "webrtc/base/helpers.h"
+#include "webrtc/base/ssladapter.h"
+
+namespace rtc {
+
+class RandomTest : public testing::Test {};
+
+TEST_F(RandomTest, TestCreateRandomId) {
+  CreateRandomId();
+}
+
+TEST_F(RandomTest, TestCreateRandomDouble) {
+  for (int i = 0; i < 100; ++i) {
+    double r = CreateRandomDouble();
+    EXPECT_GE(r, 0.0);
+    EXPECT_LT(r, 1.0);
+  }
+}
+
+TEST_F(RandomTest, TestCreateNonZeroRandomId) {
+  EXPECT_NE(0U, CreateRandomNonZeroId());
+}
+
+TEST_F(RandomTest, TestCreateRandomString) {
+  std::string random = CreateRandomString(256);
+  EXPECT_EQ(256U, random.size());
+  std::string random2;
+  EXPECT_TRUE(CreateRandomString(256, &random2));
+  EXPECT_NE(random, random2);
+  EXPECT_EQ(256U, random2.size());
+}
+
+TEST_F(RandomTest, TestCreateRandomData) {
+  static size_t kRandomDataLength = 32;
+  std::string random1;
+  std::string random2;
+  EXPECT_TRUE(CreateRandomData(kRandomDataLength, &random1));
+  EXPECT_EQ(kRandomDataLength, random1.size());
+  EXPECT_TRUE(CreateRandomData(kRandomDataLength, &random2));
+  EXPECT_EQ(kRandomDataLength, random2.size());
+  EXPECT_NE(0, memcmp(random1.data(), random2.data(), kRandomDataLength));
+}
+
+TEST_F(RandomTest, TestCreateRandomStringEvenlyDivideTable) {
+  static std::string kUnbiasedTable("01234567");
+  std::string random;
+  EXPECT_TRUE(CreateRandomString(256, kUnbiasedTable, &random));
+  EXPECT_EQ(256U, random.size());
+
+  static std::string kBiasedTable("0123456789");
+  EXPECT_FALSE(CreateRandomString(256, kBiasedTable, &random));
+  EXPECT_EQ(0U, random.size());
+}
+
+TEST_F(RandomTest, TestCreateRandomUuid) {
+  std::string random = CreateRandomUuid();
+  EXPECT_EQ(36U, random.size());
+}
+
+TEST_F(RandomTest, TestCreateRandomForTest) {
+  // Make sure we get the output we expect.
+  SetRandomTestMode(true);
+  EXPECT_EQ(2154761789U, CreateRandomId());
+  EXPECT_EQ("h0ISP4S5SJKH/9EY", CreateRandomString(16));
+  EXPECT_EQ("41706e92-cdd3-46d9-a22d-8ff1737ffb11", CreateRandomUuid());
+  static size_t kRandomDataLength = 32;
+  std::string random;
+  EXPECT_TRUE(CreateRandomData(kRandomDataLength, &random));
+  EXPECT_EQ(kRandomDataLength, random.size());
+  Buffer expected("\xbd\x52\x2a\x4b\x97\x93\x2f\x1c"
+      "\xc4\x72\xab\xa2\x88\x68\x3e\xcc"
+      "\xa3\x8d\xaf\x13\x3b\xbc\x83\xbb"
+      "\x16\xf1\xcf\x56\x0c\xf5\x4a\x8b", kRandomDataLength);
+  EXPECT_EQ(0, memcmp(expected.data(), random.data(), kRandomDataLength));
+
+  // Reset and make sure we get the same output.
+  SetRandomTestMode(true);
+  EXPECT_EQ(2154761789U, CreateRandomId());
+  EXPECT_EQ("h0ISP4S5SJKH/9EY", CreateRandomString(16));
+  EXPECT_EQ("41706e92-cdd3-46d9-a22d-8ff1737ffb11", CreateRandomUuid());
+  EXPECT_TRUE(CreateRandomData(kRandomDataLength, &random));
+  EXPECT_EQ(kRandomDataLength, random.size());
+  EXPECT_EQ(0, memcmp(expected.data(), random.data(), kRandomDataLength));
+
+  // Test different character sets.
+  SetRandomTestMode(true);
+  std::string str;
+  EXPECT_TRUE(CreateRandomString(16, "a", &str));
+  EXPECT_EQ("aaaaaaaaaaaaaaaa", str);
+  EXPECT_TRUE(CreateRandomString(16, "abcd", &str));
+  EXPECT_EQ("dbaaabdaccbcabbd", str);
+
+  // Turn off test mode for other tests.
+  SetRandomTestMode(false);
+}
+
+}  // namespace rtc