Unittest added to Network Traffic Annotation Auditor.

Network traffic annotation auditor have no test support. A unittest is added to
cover some tests.

Bug: 656607
Bug: 690323
Change-Id: I93b05cf7ec4d89fca07166b230a4fc314fc438e7
Reviewed-on: https://chromium-review.googlesource.com/519244
Commit-Queue: Ramin Halavati <rhalavati@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: Martin Šrámek <msramek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#485225}

BUILD.gn

@@ -149,6 +149,7 @@ group("gn_all") {
       "//tools/gn:gn_unittests",
       "//tools/perf/clear_system_cache",
       "//tools/traffic_annotation/auditor:traffic_annotation_auditor",
+      "//tools/traffic_annotation/auditor:traffic_annotation_auditor_unittests",
       "//ui/accessibility:accessibility_unittests",
       "//ui/accessibility/extensions",
     ]

testing/buildbot/chromium.linux.json

@@ -4138,6 +4138,12 @@
         },
         "test": "sync_integration_tests"
       },
+      {
+        "swarming": {
+          "can_use_on_swarming_builders": true
+        },
+        "test": "traffic_annotation_auditor_unittests"
+      },
       {
         "swarming": {
           "can_use_on_swarming_builders": true

testing/buildbot/gn_isolate_map.pyl

@@ -941,6 +941,11 @@
       "../../",
     ],
   },
+  "traffic_annotation_auditor_unittests": {
+    "label":
+      "//tools/traffic_annotation/auditor:traffic_annotation_auditor_unittests",
+    "type": "console_test_launcher",
+  },
   "cc_perftests": {
     "label": "//cc:cc_perftests",
     "type": "script",

tools/traffic_annotation/auditor/BUILD.gn

@@ -2,6 +2,7 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+import("//testing/test.gni")
 import("//third_party/protobuf/proto_library.gni")
 
 # Works only on desktop platforms.
@@ -41,20 +42,43 @@ proto_library("traffic_annotation") {
   use_protobuf_full = true
 }
 
-executable("traffic_annotation_auditor") {
+source_set("auditor_sources") {
   sources = [
     "../../../net/traffic_annotation/network_traffic_annotation.h",
     "../../../net/traffic_annotation/network_traffic_annotation_test_helper.h",
     "traffic_annotation_auditor.cc",
     "traffic_annotation_auditor.h",
-    "traffic_annotation_auditor_ui.cc",
     "traffic_annotation_file_filter.cc",
     "traffic_annotation_file_filter.h",
   ]
 
-  deps = [
+  public_deps = [
     ":traffic_annotation",
     "//base",
+    "//net:traffic_annotation",
     "//third_party/protobuf:protobuf_full",
   ]
 }
+
+executable("traffic_annotation_auditor") {
+  sources = [
+    "traffic_annotation_auditor_ui.cc",
+  ]
+
+  deps = [
+    ":auditor_sources",
+  ]
+}
+
+test("traffic_annotation_auditor_unittests") {
+  sources = [
+    "traffic_annotation_auditor_unittest.cc",
+  ]
+  deps = [
+    ":auditor_sources",
+    "//base/test:run_all_unittests",
+    "//base/test:test_support",
+    "//testing/gmock",
+    "//testing/gtest",
+  ]
+}

tools/traffic_annotation/auditor/traffic_annotation_auditor_unittest.cc

+// Copyright 2017 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 "tools/traffic_annotation/auditor/traffic_annotation_auditor.h"
+#include "net/traffic_annotation/network_traffic_annotation.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace {
+
+#define TEST_HASH_CODE(X)                                  \
+  EXPECT_EQ(TrafficAnnotationAuditor::ComputeHashValue(X), \
+            net::DefineNetworkTrafficAnnotation(X, "").unique_id_hash_code)
+}
+
+using namespace testing;
+
+typedef ::testing::Test TrafficAnnotationAuditorTest;
+
+// Tests if the two hash computation functions have the same result.
+TEST_F(TrafficAnnotationAuditorTest, HashFunctionCheck) {
+  TEST_HASH_CODE("test");
+  TEST_HASH_CODE("unique_id");
+  TEST_HASH_CODE("123_id");
+  TEST_HASH_CODE("ID123");
+  TEST_HASH_CODE(
+      "a_unique_looooooooooooooooooooooooooooooooooooooooooooooooooooooong_id");
+}
\ No newline at end of file