Implement Mojo message codec in JavaScript

gin/test/file_runner.cc

 // Copyright 2013 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 "gin/test/file_runner.h"
 
 #include "base/file_util.h"
 #include "gin/converter.h"
 #include "gin/modules/module_registry.h"
 #include "gin/test/gtest.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace gin {
 
 namespace {
 
 std::string GetExceptionInfo(const v8::TryCatch& try_catch) {
-  std::string info;
-  ConvertFromV8(try_catch.Message()->Get(), &info);
-  return info;
+  std::string message;
+  ConvertFromV8(try_catch.Message()->Get(), &message);
+
+  std::string source_line;
+  if (ConvertFromV8(try_catch.Message()->GetSourceLine(), &source_line))
+    message += "\n" + source_line;
+
+  return message;
 }
 
 }  // namespace
 
 FileRunnerDelegate::FileRunnerDelegate() {
 }
 
 FileRunnerDelegate::~FileRunnerDelegate() {
 }
 
 v8::Handle<v8::ObjectTemplate> FileRunnerDelegate::GetGlobalTemplate(
     Runner* runner) {
   v8::Handle<v8::ObjectTemplate> templ = v8::ObjectTemplate::New();
   ModuleRegistry::RegisterGlobals(runner->isolate(), templ);
   return templ;
 }
 
 void FileRunnerDelegate::DidCreateContext(Runner* runner) {
   v8::Handle<v8::Context> context = runner->context();
   ModuleRegistry* registry = ModuleRegistry::From(context);
 
   registry->AddBuiltinModule(runner->isolate(), "gtest",
                              GetGTestTemplate(runner->isolate()));
 }
 
-void RunTestFromFile(const base::FilePath& path, RunnerDelegate* delegate) {
-  ASSERT_TRUE(base::PathExists(path)) << path.LossyDisplayName();
-  std::string source;
-  ASSERT_TRUE(ReadFileToString(path, &source));
+void RunTestFromString(const std::string& source, RunnerDelegate* delegate) {
   gin::Runner runner(delegate, v8::Isolate::GetCurrent());
   gin::Runner::Scope scope(&runner);
 
   v8::TryCatch try_catch;
   runner.Run(source);
   EXPECT_FALSE(try_catch.HasCaught()) << GetExceptionInfo(try_catch);
 
   v8::Handle<v8::Value> result = runner.context()->Global()->Get(
       StringToSymbol(runner.isolate(), "result"));
   std::string result_string;
   ASSERT_TRUE(ConvertFromV8(result, &result_string));
   EXPECT_EQ("PASS", result_string);
 }
 
+void RunTestFromFile(const base::FilePath& path, RunnerDelegate* delegate) {
+  ASSERT_TRUE(base::PathExists(path)) << path.LossyDisplayName();
+  std::string source;
+  ASSERT_TRUE(ReadFileToString(path, &source));
+  RunTestFromString(source, delegate);
+}
+
 }  // namespace gin