- (void)test_asyncDownload_newAPI {
Downloader *loader = [Downloader new];
// download 时间为1s
XCTestExpectation *donwloadException = [[XCTestExpectation alloc] initWithDescription:@"download"];
[loader downloadWithCompletion:^(BOOL success, NSError *err) {
[donwloadException fulfill];
}];
// upload 时间为3s
XCTestExpectation *uploadException = [[XCTestExpectation alloc] initWithDescription:@"upload"];
[loader uploadWithCompletion:^(BOOL success, NSError *err) {
[uploadException fulfill];
}];
XCTWaiterResult result = [XCTWaiter waitForExpectations:@[donwloadException, uploadException] timeout:4 enforceOrder:NO];
XCTAssert(result == XCTWaiterResultCompleted, @"failed: %ld", (long)result);
}
Xcode9允许通过Bundle ID 和 fileURL(macOS)来创建一个XCUIApplication对象，以便于多个App测试。launch和activate可用来将APP从后台拉到前台，区别在于：如果app在运行中，activate不会打断app。
'' - (void)testMutipleApp {
'' XCUIApplication *readApp = [[XCUIApplication alloc] initWithBundleIdentifier:@"com.sohu.TestRead"];
'' // 启动read app
'' [readApp launch];
''
'' XCUIApplication *writeApp = [[XCUIApplication alloc] initWithBundleIdentifier:@"com.sohu.TestWrite"];
'' // 激活
'' [writeApp activate];
''
'' XCUIElement *writeTextField = writeApp.textFields[@"Input"];
'' [writeTextField tap];
'' [writeTextField typeText:@"Using Testing New API To Do Multiple App UI Test"];
'' [writeApp.buttons[@"return"] tap];
'' [writeApp.buttons[@"Send"] tap];
''
'' // back to read
'' [writeApp.alerts[@"success"].buttons[@"OK"] tap];
'' [writeApp.statusBars.buttons[@"Return to TestRead"] tap];
''
'' // 等待readApp变成活跃状态
'' NSPredicate *readAppPredicate = [NSPredicate predicateWithFormat:@"state == %d", XCUIApplicationStateRunningForeground];
'' XCTNSPredicateExpectation *expection = [[XCTNSPredicateExpectation alloc] initWithPredicate:readAppPredicate object:readApp];
'' expection.expectationDescription = @"Waiting read app to become active";
'' XCTWaiterResult result = [XCTWaiter waitForExpectations:@[expection] timeout:5];
''
'' NSLog(@"wait result:%ld", (long)result);
''
'' XCUIElement *contentLabel = readApp.staticTexts[@"Using Testing New API To Do Multiple App UI Test"];
'' XCTAssert(contentLabel.exists);
'' }
UITesting往往通过获取到某个UI控件才能进行相关测试，与voiceover相似，需要根据控件显示的内容、语义来查找，涉及生成快照，快照解包和进程间的通讯等等。Xcode9之前，采用的是快照（snapshots）技术来实现，在使用过程中，当当前屏幕下有大量控件时，例如有上千行的tableviewCell，从内存和耗费的时间两个维度来看，耗费的时间和内存占用有些大，甚至会有超时导致测试失败、内存占用过大导致闪退的情况出现…于是就有了FirstMatch
First Match：就像字面上的意思一个，只要有一个匹配到了就会马上return。
这样的话，在写查询代码的时候需要多考虑考虑怎么发挥FirstMatch的功能。
假设现在要查找navigationBar上的返回按钮:
app.buttons.firstMatch显然不是一个好的写法，这样得到的element可能不是你想要查询的；
app.buttons[@"Done"].firstMatch 这样写好多了，缩小了范围，
而最好的写法则是app.navigationBars.buttons[@"Done"].firstMatch
用于将散落的Testing语句整理在一个Group中
测试报告中可以包含更多的信息，如：截屏
新增XCUIScreenshotProviding，遵循了这个协议的，即可调用screenshot方法获取屏幕截图
'' - (void)testNewTechnoligies {
''
'' // 创建Launch Activity
'' [XCTContext runActivityNamed:@"Launch" block:^(id<XCTActivity> _Nonnull activity) {
'' XCUIApplication *app = [[XCUIApplication alloc] init];
'' app.launchArguments = @[@"-StartFromSlate", @"YES"];
'' [app launch];
'' }];
''
'' // 创建ScreenShots Activity
'' [XCTContext runActivityNamed:@"ScreenShots" block:^(id<XCTActivity> _Nonnull activity) {
'' // 生成主屏幕截图
'' XCUIScreenshot *screenShot = [[XCUIScreen mainScreen] screenshot];
'' // 将截屏添加到附件中
'' XCTAttachment *attachment = [XCTAttachment attachmentWithScreenshot:screenShot];
'' // 确保测试成功后attachment不会被自动删除, 这个同样可以在Xcode的中设置
'' attachment.lifetime = XCTAttachmentLifetimeKeepAlways;
'' // attachment添加到activity中
'' [activity addAttachment:attachment];
'' }];
'' }
测试报告中，生成了两个activity，screenshots activity还包含一张屏幕截图：
(more informatin)[http://www.jianshu.com/p/abcd67e21509]