[Extensions Bindings] Make APIBindingsSystemTest reusable

extensions/renderer/api_bindings_system_unittest.h

Index: extensions/renderer/api_bindings_system_unittest.h
diff --git a/extensions/renderer/api_bindings_system_unittest.h b/extensions/renderer/api_bindings_system_unittest.h
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+// 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.
+
+#ifndef EXTENSIONS_RENDERER_API_BINDINGS_SYSTEM_UNITTEST_H_
+#define EXTENSIONS_RENDERER_API_BINDINGS_SYSTEM_UNITTEST_H_
+
+#include <map>
+#include <memory>
+#include <string>
+
+#include "base/macros.h"
+#include "extensions/renderer/api_binding_test.h"
+#include "extensions/renderer/api_binding_types.h"
+#include "extensions/renderer/api_request_handler.h"
+#include "v8/include/v8.h"
+
+namespace base {
+class DictionaryValue;
+}
+
+namespace extensions {
+class APIBindingsSystem;
+
+// The base class to test the APIBindingsSystem. This allows subclasses to
+// retrieve API schemas differently.
+class APIBindingsSystemTest : public APIBindingTest {
+ protected:
+  // A struct representing a "fake" API, including the name and specification.
+  // The specification is expected to be a JSON-serializable string that
+  // specifies the types, methods, and events of an API in the same syntax as
+  // the real extension APIs.
+  struct FakeSpec {
+    const char* name;
+    const char* spec;
+  };
+
+  APIBindingsSystemTest();
+  ~APIBindingsSystemTest() override;
+  void SetUp() override;
+  void TearDown() override;
+  void OnWillDisposeContext(v8::Local<v8::Context> context) override;
+
+  // Returns the collection of fake APIs to be used in the test, allowing
+  // subclasses to return their own specifications.
+  virtual std::vector<FakeSpec> GetAPIs();
+
+  // Returns the object to be used as the parent for the `lastError`. The
+  // default returns an empty JS object (assumes no last errors will be set).
+  virtual v8::Local<v8::Object> GetLastErrorParent(
+      v8::Local<v8::Context> context);
+
+  // Returns the DictionaryValue representing the schema with the given API
+  // name.
+  const base::DictionaryValue& GetAPISchema(const std::string& api_name);
+
+  // Callback for event listeners changing.
+  void OnEventListenersChanged(const std::string& event_name,
+                               binding::EventListenersChanged changed,
+                               v8::Local<v8::Context> context);
+
+  // Callback for an API request being made. Stores the request in
+  // |last_request_|.
+  void OnAPIRequest(std::unique_ptr<APIRequestHandler::Request> request,
+                    v8::Local<v8::Context> context);
+
+  // Checks that |last_request_| exists and was provided with the
+  // |expected_name| and |expected_arguments|.
+  void ValidateLastRequest(const std::string& expected_name,
+                           const std::string& expected_arguments);
+
+  // Wraps the given |script source| in (function(obj) { ... }) and executes
+  // the result function, passing in |object| for an argument.
+  void CallFunctionOnObject(v8::Local<v8::Context> context,
+                            v8::Local<v8::Object> object,
+                            const std::string& script_source);
+
+  const APIRequestHandler::Request* last_request() const {
+    return last_request_.get();
+  }
+  void reset_last_request() { last_request_.reset(); }
+  APIBindingsSystem* bindings_system() { return bindings_system_.get(); }
+
+ private:
+  // The API schemas for the fake APIs.
+  std::map<std::string, std::unique_ptr<base::DictionaryValue>> api_schemas_;
+
+  // The APIBindingsSystem associated with the test. Safe to use across multiple
+  // contexts.
+  std::unique_ptr<APIBindingsSystem> bindings_system_;
+
+  // The last request to be received from the APIBindingsSystem, or null if
+  // there is none.
+  std::unique_ptr<APIRequestHandler::Request> last_request_;
+
+  DISALLOW_COPY_AND_ASSIGN(APIBindingsSystemTest);
+};
+
+}  // namespace extensions
+
+#endif  // EXTENSIONS_RENDERER_API_BINDINGS_SYSTEM_UNITTEST_H_