FlutterViewControllerTest.m

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// Copyright 2013 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 <Flutter/Flutter.h>
#import <XCTest/XCTest.h>
 
#import "AppDelegate.h"
 
FLUTTER_ASSERT_ARC
 
@interface FlutterViewControllerTest : XCTestCase
@property(nonatomic, strong) FlutterViewController* flutterViewController;
@end
 
@implementation FlutterViewControllerTest
 
- (void)setUp {
  [super setUp];
  self.continueAfterFailure = NO;
}
 
- (void)tearDown {
  if (self.flutterViewController) {
    XCTestExpectation* vcDismissed = [self expectationWithDescription:@"dismiss"];
    [self.flutterViewController dismissViewControllerAnimated:NO
                                                   completion:^{
                                                     [vcDismissed fulfill];
                                                   }];
    [self waitForExpectationsWithTimeout:10.0 handler:nil];
  }
  [super tearDown];
}
 
- (void)testFirstFrameCallback {
  XCTestExpectation* firstFrameRendered = [self expectationWithDescription:@"firstFrameRendered"];
 
  FlutterEngine* engine = [[FlutterEngine alloc] initWithName:@"test" project:nil];
  [engine runWithEntrypoint:nil];
  self.flutterViewController = [[FlutterViewController alloc] initWithEngine:engine
                                                                     nibName:nil
                                                                      bundle:nil];
 
  XCTAssertFalse(self.flutterViewController.isDisplayingFlutterUI);
 
  XCTestExpectation* displayingFlutterUIExpectation =
      [self keyValueObservingExpectationForObject:self.flutterViewController
                                          keyPath:@"displayingFlutterUI"
                                    expectedValue:@YES];
  displayingFlutterUIExpectation.assertForOverFulfill = YES;
 
  [self.flutterViewController setFlutterViewDidRenderCallback:^{
    [firstFrameRendered fulfill];
  }];
 
  AppDelegate* appDelegate = (AppDelegate*)UIApplication.sharedApplication.delegate;
  UIViewController* rootVC = appDelegate.window.rootViewController;
  [rootVC presentViewController:self.flutterViewController animated:NO completion:nil];
 
  [self waitForExpectationsWithTimeout:30.0 handler:nil];
}
 
- (void)testDrawLayer {
  XCTestExpectation* firstFrameRendered = [self expectationWithDescription:@"firstFrameRendered"];
  XCTestExpectation* imageRendered = [self expectationWithDescription:@"imageRendered"];
 
  FlutterEngine* engine = [[FlutterEngine alloc] initWithName:@"test" project:nil];
  [engine runWithEntrypoint:nil];
  [engine.binaryMessenger
      setMessageHandlerOnChannel:@"waiting_for_status"
            binaryMessageHandler:^(NSData* _Nullable message, FlutterBinaryReply _Nonnull reply) {
              FlutterMethodChannel* channel = [FlutterMethodChannel
                  methodChannelWithName:@"driver"
                        binaryMessenger:engine.binaryMessenger
                                  codec:[FlutterJSONMethodCodec sharedInstance]];
              [channel invokeMethod:@"set_scenario" arguments:@{@"name" : @"solid_blue"}];
            }];
 
  self.flutterViewController = [[FlutterViewController alloc] initWithEngine:engine
                                                                     nibName:nil
                                                                      bundle:nil];
 
  XCTAssertFalse(self.flutterViewController.isDisplayingFlutterUI);
 
  [self.flutterViewController setFlutterViewDidRenderCallback:^{
    [firstFrameRendered fulfill];
  }];
 
  AppDelegate* appDelegate = (AppDelegate*)UIApplication.sharedApplication.delegate;
  UIViewController* rootVC = appDelegate.window.rootViewController;
  [rootVC presentViewController:self.flutterViewController animated:NO completion:nil];
 
  CGColorSpaceRef color_space = CGColorSpaceCreateDeviceRGB();
 
  __block dispatch_block_t callback;
  callback = ^{
    size_t width = 300u;
    CGContextRef context =
        CGBitmapContextCreate(nil, width, width, 8, 4 * width, color_space,
                              kCGBitmapByteOrder32Little | kCGImageAlphaPremultipliedFirst);
    [appDelegate.window.layer renderInContext:context];
    uint32_t* image_data = (uint32_t*)CGBitmapContextGetData(context);
    if (image_data[20] == 0xFF0000FF) {
      [imageRendered fulfill];
      return;
    }
 
    CGContextRelease(context);
 
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, NSEC_PER_SEC), dispatch_get_main_queue(),
                   callback);
  };
  dispatch_after(dispatch_time(DISPATCH_TIME_NOW, NSEC_PER_SEC), dispatch_get_main_queue(),
                 callback);
 
  [self waitForExpectationsWithTimeout:30.0 handler:nil];
 
  CGColorSpaceRelease(color_space);
}
 
@end