dev/integration_tests/ios_platform_view_tests/ios/PlatformViewUITests/PlatformViewUITests.m

// Copyright 2014 The Flutter 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 XCTest;

static const CGFloat kStandardTimeOut = 60.0;

@interface XCUIElement(KeyboardFocus)
@property (nonatomic, readonly) BOOL flt_hasKeyboardFocus;
@end

@implementation XCUIElement(KeyboardFocus)
- (BOOL)flt_hasKeyboardFocus {
  return [[self valueForKey:@"hasKeyboardFocus"] boolValue];
}
@end

@interface PlatformViewUITests : XCTestCase
@property (strong) XCUIApplication *app;
@end

@implementation PlatformViewUITests

- (void)setUp {
  [super setUp];
  self.continueAfterFailure = NO;

  // Retry launching the app if it fails to launch.
  // This is trying to fix a "failed to terminate" failure, which is likely a bug in Xcode.
  // The solution is based on https://stackoverflow.com/questions/41872848/xctests-failing-to-launch-app-in-simulator-intermittently
  int remainingLaunchCount = 10;
  while (true) {
    self.app = [[XCUIApplication alloc] init];
    [self.app launch];
    remainingLaunchCount -= 1;
    [NSThread sleepForTimeInterval:3];
    if (self.app.exists) {
      // success launch
      break;
    }

    if (remainingLaunchCount > 0) {
      NSLog(@"Retry launch with remaining launch count %d", remainingLaunchCount);
      [self.app terminate];
      [NSThread sleepForTimeInterval:3];
      continue;
    }

    NSLog(@"Failed to launch");
  }
}

- (void)tearDown {
  [self.app terminate];
  [super tearDown];
}

- (void)testPlatformViewFocus {
  XCUIElement *entranceButton = self.app.buttons[@"platform view focus test"];
  XCTAssertTrue([entranceButton waitForExistenceWithTimeout:kStandardTimeOut], @"The element tree is %@", self.app.debugDescription);
  [entranceButton tap];

  XCUIElement *platformView = self.app.textFields[@"platform_view[0]"];
  XCTAssertTrue([platformView waitForExistenceWithTimeout:kStandardTimeOut]);
  XCUIElement *flutterTextField = self.app.textFields[@"Flutter Text Field"];
  XCTAssertTrue([flutterTextField waitForExistenceWithTimeout:kStandardTimeOut]);

  [flutterTextField tap];
  XCTAssertTrue([self.app.windows.element waitForExistenceWithTimeout:kStandardTimeOut]);
  XCTAssertFalse(platformView.flt_hasKeyboardFocus);
  XCTAssertTrue(flutterTextField.flt_hasKeyboardFocus);

  // Tapping on platformView should unfocus the previously focused flutterTextField
  [platformView tap];
  XCTAssertTrue(platformView.flt_hasKeyboardFocus);
  XCTAssertFalse(flutterTextField.flt_hasKeyboardFocus);
}

@end