[Extensions Bindings] Add more utility functions

extensions/renderer/api_binding_test_util.cc

 // Copyright 2016 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 "extensions/renderer/api_binding_test_util.h"
 
 #include "base/json/json_reader.h"
 #include "base/json/json_writer.h"
 #include "base/strings/string_util.h"
 #include "base/values.h"
 #include "content/public/child/v8_value_converter.h"
 #include "gin/converter.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace extensions {
 
+namespace {
+
+// Common call function implementation. Calls the given |function| with the
+// specified |receiver| and arguments. If the call succeeds (doesn't throw an
+// error), populates |out_value| with the returned result. If the call does
+// throw, |out_error| with the thrown error.

[lazyboy, 2016/10/25 20:09:07]

nit: |out_error| contains the thrown error or sth.

[Devlin, 2016/10/25 20:55:52]

Whoops!  Done.

+// Returns true if the function runs without throwing an error.
+bool RunFunctionImpl(v8::Local<v8::Function> function,
+                     v8::Local<v8::Context> context,
+                     v8::Local<v8::Value> receiver,
+                     int argc,
+                     v8::Local<v8::Value> argv[],
+                     v8::Local<v8::Value>* out_value,
+                     std::string* out_error) {
+  v8::TryCatch try_catch(context->GetIsolate());
+  v8::MaybeLocal<v8::Value> maybe_result =
+      function->Call(context, receiver, argc, argv);
+  if (try_catch.HasCaught()) {
+    *out_error = gin::V8ToString(try_catch.Message()->Get());
+    return false;
+  }
+  v8::Local<v8::Value> result;
+  if (!maybe_result.ToLocal(&result)) {
+    *out_error = "Could not convert result to v8::Local.";
+    return false;
+  }
+  *out_value = result;
+  return true;
+}
+
+}  // namespace
+
 std::string ReplaceSingleQuotes(base::StringPiece str) {
   std::string result;
   base::ReplaceChars(str.as_string(), "'", "\"", &result);
   return result;
 }
 
 std::unique_ptr<base::Value> ValueFromString(base::StringPiece str) {
   std::unique_ptr<base::Value> value =
       base::JSONReader::Read(ReplaceSingleQuotes(str));
   EXPECT_TRUE(value) << str;
@@ skipping 33 matching lines @@
   return function;
 }
 
 std::unique_ptr<base::Value> V8ToBaseValue(v8::Local<v8::Value> value,
                                            v8::Local<v8::Context> context) {
   std::unique_ptr<content::V8ValueConverter> converter(
       content::V8ValueConverter::create());
   return converter->FromV8Value(value, context);
 }
 
+v8::Local<v8::Value> RunFunction(v8::Local<v8::Function> function,
+                                 v8::Local<v8::Context> context,
+                                 v8::Local<v8::Value> receiver,
+                                 int argc,
+                                 v8::Local<v8::Value> argv[]) {
+  std::string error;
+  v8::Local<v8::Value> result;
+  EXPECT_TRUE(
+      RunFunctionImpl(function, context, receiver, argc, argv, &result, &error))
+      << error;
+  return result;
+}
+
+v8::Local<v8::Value> RunFunction(v8::Local<v8::Function> function,
+                                 v8::Local<v8::Context> context,
+                                 int argc,
+                                 v8::Local<v8::Value> argv[]) {
+  return RunFunction(function, context, v8::Undefined(context->GetIsolate()),
+                     argc, argv);
+}
+
+v8::Local<v8::Value> RunFunctionOnGlobal(v8::Local<v8::Function> function,
+                                         v8::Local<v8::Context> context,
+                                         int argc,
+                                         v8::Local<v8::Value> argv[]) {
+  return RunFunction(function, context, context->Global(), argc, argv);
+}
+
+void RunFunctionOnGlobalAndIgnoreResult(v8::Local<v8::Function> function,
+                                        v8::Local<v8::Context> context,
+                                        int argc,
+                                        v8::Local<v8::Value> argv[]) {
+  RunFunction(function, context, context->Global(), argc, argv);
+}
+
+void RunFunctionAndExpectError(v8::Local<v8::Function> function,
+                               v8::Local<v8::Context> context,
+                               v8::Local<v8::Value> receiver,
+                               int argc,
+                               v8::Local<v8::Value> argv[],
+                               const std::string& expected_error) {
+  std::string error;
+  v8::Local<v8::Value> result;
+  EXPECT_FALSE(RunFunctionImpl(function, context, receiver, argc, argv, &result,
+                               &error));
+  EXPECT_EQ(expected_error, error);

[lazyboy, 2016/10/25 20:09:07]

EXPECT_TRUE(result.isEmpty())?

[Devlin, 2016/10/25 20:55:52]

Done.

+}
+
+void RunFunctionAndExpectError(v8::Local<v8::Function> function,
+                               v8::Local<v8::Context> context,
+                               int argc,
+                               v8::Local<v8::Value> argv[],
+                               const std::string& expected_error) {
+  RunFunctionAndExpectError(function, context,
+                            v8::Undefined(context->GetIsolate()), argc, argv,
+                            expected_error);
+}
+
+v8::Local<v8::Value> GetPropertyFromObject(v8::Local<v8::Object> object,
+                                           v8::Local<v8::Context> context,
+                                           base::StringPiece key) {
+  v8::Local<v8::Value> result;
+  EXPECT_TRUE(object->Get(context, gin::StringToV8(context->GetIsolate(), key))
+                  .ToLocal(&result));
+  return result;
+}
+
+std::unique_ptr<base::Value> GetBaseValuePropertyFromObject(
+    v8::Local<v8::Object> object,
+    v8::Local<v8::Context> context,
+    base::StringPiece key) {
+  return V8ToBaseValue(GetPropertyFromObject(object, context, key), context);
+}
+
 }  // namespace extensions