Refactor MainHook into TestSuite.

base/test/test_support_ios.mm

 // Copyright (c) 2012 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.
 
+#import <UIKit/UIKit.h>
+
+#include "base/debug/debugger.h"
+#include "base/logging.h"
+#include "base/mac/scoped_nsautorelease_pool.h"
+#include "base/memory/scoped_nsobject.h"
 #include "base/message_loop.h"
 #include "base/message_pump_default.h"
+#include "base/test/test_suite.h"
+
+// Springboard will kill any iOS app that fails to check in after launch within
+// a given time. Starting a UIApplication before invoking TestSuite::Run
+// prevents this from happening.
+
+// InitIOSRunHook saves the TestSuite and argc/argv, then invoking
+// RunTestsFromIOSApp calls UIApplicationMain(), providing an application
+// delegate class: ChromeUnitTestDelegate. The delegate implements
+// application:didFinishLaunchingWithOptions: to invoke the TestSuite's Run
+// method.
+
+// Since the executable isn't likely to be a real iOS UI, the delegate puts up a
+// window displaying the app name. If a bunch of apps using MainHook are being
+// run in a row, this provides an indication of which one is currently running.
+
+static base::TestSuite* g_test_suite = NULL;
+static int g_argc;
+static char** g_argv;
+
+@interface UIApplication (Testing)
+- (void) _terminateWithStatus:(int)status;
+@end
+
+@interface ChromeUnitTestDelegate : NSObject {
+ @private
+  scoped_nsobject<UIWindow> window_;
+}
+- (void)runTests;
+@end
+
+@implementation ChromeUnitTestDelegate
+
+- (BOOL)application:(UIApplication *)application
+    didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
+
+  CGRect bounds = [[UIScreen mainScreen] bounds];
+
+  // Yes, this is leaked, it's just to make what's running visible.
+  window_.reset([[UIWindow alloc] initWithFrame:bounds]);
+  [window_ makeKeyAndVisible];
+
+  // Add a label with the app name.
+  UILabel* label = [[[UILabel alloc] initWithFrame:bounds] autorelease];
+  label.text = [[NSProcessInfo processInfo] processName];
+  label.textAlignment = UITextAlignmentCenter;
+  [window_ addSubview:label];
+
+  // Queue up the test run.
+  [self performSelector:@selector(runTests)
+             withObject:nil
+             afterDelay:0.1];
+  return YES;
+}
+
+- (void)runTests {
+  int exitStatus = g_test_suite->Run();
+
+  // If a test app is too fast, it will exit before Instruments has has a
+  // a chance to initialize and no test results will be seen.
+  // TODO(ios): crbug.com/137010 Figure out how much time is actually needed,
+  // and sleep only to make sure that much time has elapsed since launch.
+  [NSThread sleepUntilDate:[NSDate dateWithTimeIntervalSinceNow:2.0]];
+  window_.reset();
+
+  // Use the hidden selector to try and cleanly take down the app (otherwise
+  // things can think the app crashed even on a zero exit status).
+  UIApplication* application = [UIApplication sharedApplication];
+  [application _terminateWithStatus:exitStatus];
+
+  exit(exitStatus);
+}
+
+@end
 
 namespace {
 
 base::MessagePump* CreateMessagePumpForUIForTests() {
   // A default MessagePump will do quite nicely in tests.
   return new base::MessagePumpDefault();
 }
 
 }  // namespace
 
 namespace base {
 
 void InitIOSTestMessageLoop() {
   MessageLoop::InitMessagePumpForUIFactory(&CreateMessagePumpForUIForTests);
 }
 
+void InitIOSRunHook(TestSuite* suite, int argc, char* argv[]) {
+  g_test_suite = suite;
+  g_argc = argc;
+  g_argv = argv;
+}
+
+void RunTestsFromIOSApp() {
+  // When TestSuite::Run is invoked it calls RunTestsFromIOSApp(). On the first
+  // invocation, this method fires up an iOS app via UIApplicationMain. Since
+  // UIApplicationMain does not return until the app exits, control does not
+  // return to the initial TestSuite::Run invocation, so the app invokes
+  // TestSuite::Run a second time and since |ran_hook| is true at this point,
+  // this method is a no-op and control returns to TestSuite:Run so that test
+  // are executed. Once the app exits, RunTestsFromIOSApp calls exit() so that
+  // control is not returned to the initial invocation of TestSuite::Run.
+  static bool ran_hook = false;
+  if (!ran_hook) {
+    ran_hook = true;
+    mac::ScopedNSAutoreleasePool pool;
+    int exit_status = UIApplicationMain(g_argc, g_argv, nil,
+                                        @"ChromeUnitTestDelegate");
+    exit(exit_status);
+  }
+}
+
 }  // namespace base