mash: Add a launch-test for ash_sysui.

mash/wm/app_launch_unittest.cc

Index: mash/wm/app_launch_unittest.cc
diff --git a/mash/wm/app_launch_unittest.cc b/mash/wm/app_launch_unittest.cc
index 337ab6f4efd3c6274d532e61fcd73ad2421dab2a..eb9b0f3f46ebcf6e69a511dfff777ed83ab12580 100644
--- a/mash/wm/app_launch_unittest.cc
+++ b/mash/wm/app_launch_unittest.cc
@@ -21,6 +21,21 @@ class AppLaunchTest : public shell::test::ShellTest {
   AppLaunchTest() : ShellTest("exe:mash_unittests") {}
   ~AppLaunchTest() override {}
 
+  bool LaunchApp(const std::string& app) {
+    connector()->Connect("mojo:desktop_wm");
+    connector()->Connect(app);
+
+    mus::mojom::WindowServerTestPtr test_interface;
+    connector()->ConnectToInterface("mojo:mus", &test_interface);
+
+    base::RunLoop run_loop;
+    bool success = false;
+    test_interface->EnsureClientHasDrawnWindow(
+        app, base::Bind(&RunCallback, &success, run_loop.QuitClosure()));
+    run_loop.Run();
+    return success;
+  }
+
  private:
   void SetUp() override {
     base::CommandLine::ForCurrentProcess()->AppendSwitch("use-test-config");
@@ -31,19 +46,11 @@ class AppLaunchTest : public shell::test::ShellTest {
 };
 
 TEST_F(AppLaunchTest, TestQuickLaunch) {
-  connector()->Connect("mojo:desktop_wm");
-  connector()->Connect("mojo:quick_launch");
-
-  mus::mojom::WindowServerTestPtr test_interface;
-  connector()->ConnectToInterface("mojo:mus", &test_interface);
-
-  base::RunLoop run_loop;
-  bool success = false;
-  test_interface->EnsureClientHasDrawnWindow(
-      "mojo:quick_launch",
-      base::Bind(&RunCallback, &success, run_loop.QuitClosure()));
-  run_loop.Run();
-  EXPECT_TRUE(success);
+  EXPECT_TRUE(LaunchApp("mojo:quick_launch"));
+}
+
+TEST_F(AppLaunchTest, TestAshSysui) {
+  EXPECT_TRUE(LaunchApp("mojo:ash_sysui"));
 }
 
 }  // namespace wm