Pass command line args to apptests

examples/apptest/example_apptest.cc

Index: examples/apptest/example_apptest.cc
diff --git a/examples/apptest/example_apptest.cc b/examples/apptest/example_apptest.cc
index b7a8e45daaaa53ace742685b66c8c75c9369cd23..2d50e16f353205759fd6b9b212264cbe4006ed18 100644
--- a/examples/apptest/example_apptest.cc
+++ b/examples/apptest/example_apptest.cc
@@ -17,8 +17,7 @@ namespace {
 // Exemplifies ApplicationTestBase's application testing pattern.
 class ExampleApplicationTest : public test::ApplicationTestBase {
  public:
-  // TODO(msw): Exemplify the use of actual command line arguments.
-  ExampleApplicationTest() : ApplicationTestBase(Array<String>()) {}
+  ExampleApplicationTest() : ApplicationTestBase() {}
   ~ExampleApplicationTest() override {}
 
  protected:
@@ -28,6 +27,7 @@ class ExampleApplicationTest : public test::ApplicationTestBase {
   }
   void SetUp() override {
     ApplicationTestBase::SetUp();
+
     application_impl()->ConnectToService("mojo:example_service",
                                          &example_service_);
     example_service_.set_client(&example_client_);
@@ -75,5 +75,12 @@ TEST_F(ExampleApplicationTest, RunCallbackViaService) {
   EXPECT_TRUE(was_run);
 }
 
+TEST_F(ExampleApplicationTest, CheckCommandLineArg) {
+  // apptest_runner.py adds this argument unconditionally so we can check
+  // for it here to verify that command line args are getting passed to
+  // apptests.
+  ASSERT_TRUE(application_impl()->HasArg("--example_apptest_arg"));
+}
+
 }  // namespace
 }  // namespace mojo