diff --git a/webrtc/base/helpers_unittest.cc b/webrtc/base/helpers_unittest.cc
new file mode 100644
index 0000000..7c20540
--- /dev/null
+++ b/webrtc/base/helpers_unittest.cc
@@ -0,0 +1,78 @@
+/*
+ *  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/gunit.h"
+#include "webrtc/base/helpers.h"
+#include "webrtc/base/ssladapter.h"
+
+namespace rtc {
+
+class RandomTest : public testing::Test {
+ public:
+  static void SetUpTestCase() {
+    rtc::InitializeSSL();
+  }
+
+  static void TearDownTestCase() {
+    rtc::CleanupSSL();
+  }
+};
+
+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, TestCreateRandomForTest) {
+  // Make sure we get the output we expect.
+  SetRandomTestMode(true);
+  EXPECT_EQ(2154761789U, CreateRandomId());
+  EXPECT_EQ("h0ISP4S5SJKH/9EY", CreateRandomString(16));
+
+  // Reset and make sure we get the same output.
+  SetRandomTestMode(true);
+  EXPECT_EQ(2154761789U, CreateRandomId());
+  EXPECT_EQ("h0ISP4S5SJKH/9EY", CreateRandomString(16));
+
+  // Test different character sets.
+  SetRandomTestMode(true);
+  std::string str;
+  EXPECT_TRUE(CreateRandomString(16, "a", &str));
+  EXPECT_EQ("aaaaaaaaaaaaaaaa", str);
+  EXPECT_TRUE(CreateRandomString(16, "abc", &str));
+  EXPECT_EQ("acbccaaaabbaacbb", str);
+
+  // Turn off test mode for other tests.
+  SetRandomTestMode(false);
+}
+
+}  // namespace rtc