Pass command line args to apptests

mojo/public/cpp/application/application_test_base.h

 // Copyright 2014 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 MOJO_PUBLIC_CPP_APPLICATION_APPLICATION_TEST_BASE_H_
 #define MOJO_PUBLIC_CPP_APPLICATION_APPLICATION_TEST_BASE_H_
 
 #include "mojo/public/cpp/bindings/array.h"
 #include "mojo/public/cpp/bindings/string.h"
 #include "mojo/public/cpp/system/macros.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace mojo {
 
 class ApplicationDelegate;
 class ApplicationImpl;
 
 namespace test {
 
 // Access the shell handle shared by multiple test application instances.
 ScopedMessagePipeHandle PassShellHandle();
 void SetShellHandle(ScopedMessagePipeHandle handle);
 
+// Access the command line arguments passed to the application test.
+const Array<String>& Args();
+void InitializeArgs(int argc, std::vector<const char*> argv);
+
 // A GTEST base class for application testing executed in mojo_shell.
 class ApplicationTestBase : public testing::Test {
  public:
-  explicit ApplicationTestBase(Array<String> args);
+  ApplicationTestBase();
   ~ApplicationTestBase() override;
 
  protected:
   ApplicationImpl* application_impl() { return application_impl_; }
 
   // Get the ApplicationDelegate for the application to be tested.
   virtual ApplicationDelegate* GetApplicationDelegate() = 0;
 
+  // A testing::Test::SetUp helper to override the application command
+  // line arguments.
+  void SetUpWithArgs(const Array<String>& args);
+
   // testing::Test:
   void SetUp() override;
   void TearDown() override;
 
  private:
-  // The command line arguments supplied to each test application instance.
-  Array<String> args_;
-
   // The application implementation instance, reconstructed for each test.
   ApplicationImpl* application_impl_;
 
   MOJO_DISALLOW_COPY_AND_ASSIGN(ApplicationTestBase);
 };
 
 }  // namespace test
 
 }  // namespace mojo
 
 #endif  // MOJO_PUBLIC_CPP_APPLICATION_APPLICATION_TEST_BASE_H_