http://codereview.chromium.org/147084...

chrome/browser/metrics/metrics_service_unittest.cc

+// Copyright (c) 2009 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.
+
+#include "chrome/browser/metrics/metrics_service.h"
+
+#include <string>
+#include "testing/gtest/include/gtest/gtest.h"
+
+#if defined(OS_POSIX) && defined(LINUX2)
+TEST(MetricsServiceTest, ClientIdGeneratesAllZeroes) {
+  uint64 bytes[] = { 0, 0 };
+  std::string clientid = MetricsService::RandomBytesToGUIDString(bytes);
+  EXPECT_EQ("00000000-0000-0000-0000-000000000000", clientid);
+}
+TEST(MetricsServiceTest, ClientIdGeneratesCorrectly) {
+  uint64 bytes[] = { 0x0123456789ABCDEFULL, 0xFEDCBA9876543210ULL };
+  std::string clientid = MetricsService::RandomBytesToGUIDString(bytes);
+  EXPECT_EQ("01234567-89AB-CDEF-FEDC-BA9876543210", clientid);
+}
+
+TEST(MetricsServiceTest, ClientIdCorrectlyFormatted) {
+  std::string clientid = MetricsService::GenerateClientID();
+  EXPECT_EQ(36U, clientid.length());
+  std::string hexchars = "0123456789ABCDEF";
+  for (uint32 i = 0; i < clientid.length(); i++) {
+    char current = clientid.at(i);
+    if (i == 8 || i == 13 || i == 18 || i == 23) {
+      EXPECT_EQ('-', current);
+    } else {
+      EXPECT_TRUE(std::string::npos != hexchars.find(current));
+    }
+  }
+}
+#endif