components/Ink/tests/unit/MDCInkLayerTests.m

// Copyright 2017-present the Material Components for iOS authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#import <CoreGraphics/CoreGraphics.h>
#import <XCTest/XCTest.h>

#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wprivate-header"
#import "MDCInkLayer.h"
#import "MDCInkLayerDelegate.h"
#pragma clang diagnostic pop

NS_ASSUME_NONNULL_BEGIN

#pragma mark - Fake classes

@interface CapturingMDCInkLayerSubclass : MDCInkLayer
@property(nonatomic, strong) NSMutableArray *addedAnimations;

@end

@implementation CapturingMDCInkLayerSubclass

- (void)addAnimation:(CAAnimation *)anim forKey:(nullable NSString *)key {
  if (!self.addedAnimations) {
    self.addedAnimations = [NSMutableArray array];
  }
  [self.addedAnimations addObject:anim];
  [super addAnimation:anim forKey:key];
}

@end

@interface FakeMDCInkLayerAnimationDelegate : NSObject <MDCInkLayerDelegate>
@property(nonatomic, strong) MDCInkLayer *inkLayer;
@end

@implementation FakeMDCInkLayerAnimationDelegate
@end

#pragma mark - Tests

@interface MDCInkLayerTests : XCTestCase

@end

@implementation MDCInkLayerTests

- (void)testInit {
  // Given
  MDCInkLayer *inkLayer = [[MDCInkLayer alloc] init];

  // Then
  XCTAssertNil(inkLayer.delegate);
  XCTAssertFalse(inkLayer.isStartAnimationActive);
  XCTAssertEqualWithAccuracy(inkLayer.endAnimationDelay, 0, 0.0001);
  XCTAssertEqualWithAccuracy(inkLayer.initialRadius, 0, 0.0001);
  XCTAssertEqualWithAccuracy(inkLayer.finalRadius, 0, 0.0001);
  XCTAssertEqualWithAccuracy(inkLayer.maxRippleRadius, 0, 0.0001);
  XCTAssertEqualObjects(inkLayer.inkColor, [UIColor colorWithWhite:0 alpha:(CGFloat)0.08]);
}

- (void)testInitWithLayer {
  // Given
  FakeMDCInkLayerAnimationDelegate *delegate = [[FakeMDCInkLayerAnimationDelegate alloc] init];
  MDCInkLayer *inkLayer = [[MDCInkLayer alloc] init];
  delegate.inkLayer = inkLayer;
  inkLayer.delegate = delegate;
  inkLayer.endAnimationDelay = 1;
  inkLayer.initialRadius = 2;
  inkLayer.finalRadius = 3;
  inkLayer.maxRippleRadius = 4;
  inkLayer.inkColor = UIColor.magentaColor;

  // When
  MDCInkLayer *copiedLayer = [[MDCInkLayer alloc] initWithLayer:inkLayer];

  // Then
  XCTAssertNil(copiedLayer.delegate);
  XCTAssertEqualWithAccuracy(copiedLayer.endAnimationDelay, inkLayer.endAnimationDelay, 0.0001);
  XCTAssertEqualWithAccuracy(copiedLayer.initialRadius, inkLayer.initialRadius, 0.0001);
  XCTAssertEqualWithAccuracy(copiedLayer.finalRadius, inkLayer.finalRadius, 0.0001);
  XCTAssertEqualWithAccuracy(copiedLayer.maxRippleRadius, inkLayer.maxRippleRadius, 0.0001);
  XCTAssertEqualObjects(copiedLayer.inkColor, inkLayer.inkColor);
  XCTAssertEqual(copiedLayer.sublayers.count, inkLayer.sublayers.count);
}

- (void)testEndAnimationTimingInTimeScaledLayer {
  // Given
  CapturingMDCInkLayerSubclass *inkLayer = [[CapturingMDCInkLayerSubclass alloc] init];
  inkLayer.bounds = CGRectMake(0, 0, 10, 10);
  inkLayer.speed = (float)0.0025;
  inkLayer.endAnimationDelay = (CGFloat)0.9;

  // When
  [inkLayer endAnimationAtPoint:CGPointMake(5, 5)];
  NSTimeInterval startTime = CACurrentMediaTime();

  // Then
  XCTAssertEqual(inkLayer.addedAnimations.count, 1U);
  CAAnimation *animation = inkLayer.addedAnimations.firstObject;
  if (animation) {
    startTime = [inkLayer convertTime:(startTime + 0.9) fromLayer:nil];
    XCTAssertEqualWithAccuracy(animation.beginTime, startTime, 0.010);
  }
}

- (void)testChangeAnimationTimingInTimeScaledLayer {
  // Given
  CapturingMDCInkLayerSubclass *inkLayer = [[CapturingMDCInkLayerSubclass alloc] init];
  inkLayer.bounds = CGRectMake(0, 0, 10, 10);
  inkLayer.speed = (float)0.0025;

  // When
  [inkLayer changeAnimationAtPoint:CGPointMake(5, 5)];
  NSTimeInterval startTime = CACurrentMediaTime();

  // Then
  XCTAssertEqual(inkLayer.addedAnimations.count, 1U);
  CAAnimation *animation = inkLayer.addedAnimations.firstObject;
  if (animation) {
    startTime = [inkLayer convertTime:startTime fromLayer:nil];
    XCTAssertEqualWithAccuracy(animation.beginTime, startTime, (CGFloat)0.1);
  }
}

@end

NS_ASSUME_NONNULL_END