RCTAnimationUtilsTests.m

/*
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

#import <XCTest/XCTest.h>

#import <React/RCTAnimationUtils.h>
#import <React/RCTConvert.h>
#import <React/RCTInterpolationAnimatedNode.h>

@interface RCTAnimationUtilsTests : XCTestCase

@end

static CGFloat RCTSimpleInterpolation(CGFloat value, NSArray<NSNumber *> *inputRange, NSArray<NSNumber *> *outputRange)
{
  return RCTInterpolateValueInRange(value, inputRange, outputRange, EXTRAPOLATE_TYPE_EXTEND, EXTRAPOLATE_TYPE_EXTEND);
}

@implementation RCTAnimationUtilsTests

// RCTInterpolateValueInRange

- (void)testSimpleOneToOneMapping
{
  NSArray<NSNumber *> *input = @[ @0, @1 ];
  NSArray<NSNumber *> *output = @[ @0, @1 ];
  XCTAssertEqual(RCTSimpleInterpolation(0, input, output), 0);
  XCTAssertEqual(RCTSimpleInterpolation(0.5, input, output), 0.5);
  XCTAssertEqual(RCTSimpleInterpolation(0.8, input, output), 0.8);
  XCTAssertEqual(RCTSimpleInterpolation(1, input, output), 1);
}

- (void)testWiderOutputRange
{
  NSArray<NSNumber *> *input = @[ @0, @1 ];
  NSArray<NSNumber *> *output = @[ @100, @200 ];
  XCTAssertEqual(RCTSimpleInterpolation(0, input, output), 100);
  XCTAssertEqual(RCTSimpleInterpolation(0.5, input, output), 150);
  XCTAssertEqual(RCTSimpleInterpolation(0.8, input, output), 180);
  XCTAssertEqual(RCTSimpleInterpolation(1, input, output), 200);
}

- (void)testWiderInputRange
{
  NSArray<NSNumber *> *input = @[ @2000, @3000 ];
  NSArray<NSNumber *> *output = @[ @1, @2 ];
  XCTAssertEqual(RCTSimpleInterpolation(2000, input, output), 1);
  XCTAssertEqual(RCTSimpleInterpolation(2250, input, output), 1.25);
  XCTAssertEqual(RCTSimpleInterpolation(2800, input, output), 1.8);
  XCTAssertEqual(RCTSimpleInterpolation(3000, input, output), 2);
}

- (void)testManySegments
{
  NSArray<NSNumber *> *input = @[ @-1, @1, @5 ];
  NSArray<NSNumber *> *output = @[ @0, @10, @20 ];
  XCTAssertEqual(RCTSimpleInterpolation(-1, input, output), 0);
  XCTAssertEqual(RCTSimpleInterpolation(0, input, output), 5);
  XCTAssertEqual(RCTSimpleInterpolation(1, input, output), 10);
  XCTAssertEqual(RCTSimpleInterpolation(2, input, output), 12.5);
  XCTAssertEqual(RCTSimpleInterpolation(5, input, output), 20);
}

- (void)testExtendExtrapolate
{
  NSArray<NSNumber *> *input = @[ @10, @20 ];
  NSArray<NSNumber *> *output = @[ @0, @1 ];
  XCTAssertEqual(RCTSimpleInterpolation(30, input, output), 2);
  XCTAssertEqual(RCTSimpleInterpolation(5, input, output), -0.5);
}

- (void)testClampExtrapolate
{
  NSArray<NSNumber *> *input = @[ @10, @20 ];
  NSArray<NSNumber *> *output = @[ @0, @1 ];
  CGFloat value;
  value = RCTInterpolateValueInRange(30, input, output, EXTRAPOLATE_TYPE_CLAMP, EXTRAPOLATE_TYPE_CLAMP);
  XCTAssertEqual(value, 1);
  value = RCTInterpolateValueInRange(5, input, output, EXTRAPOLATE_TYPE_CLAMP, EXTRAPOLATE_TYPE_CLAMP);
  XCTAssertEqual(value, 0);
}

- (void)testIdentityExtrapolate
{
  NSArray<NSNumber *> *input = @[ @10, @20 ];
  NSArray<NSNumber *> *output = @[ @0, @1 ];
  CGFloat value;
  value = RCTInterpolateValueInRange(30, input, output, EXTRAPOLATE_TYPE_IDENTITY, EXTRAPOLATE_TYPE_IDENTITY);
  XCTAssertEqual(value, 30);
  value = RCTInterpolateValueInRange(5, input, output, EXTRAPOLATE_TYPE_IDENTITY, EXTRAPOLATE_TYPE_IDENTITY);
  XCTAssertEqual(value, 5);
}

- (void)testColorInterpolation
{
  NSArray<NSNumber *> *input = @[ @0, @1 ];
  NSArray<RCTUIColor *> *output = @[ [RCTUIColor redColor], [RCTUIColor blueColor] ]; // [macOS]
  uint32_t value;
  value = RCTInterpolateColorInRange(0, input, output);
  XCTAssertEqualObjects([RCTConvert UIColor:@(value)], [RCTUIColor redColor]); // [macOS]
  value = RCTInterpolateColorInRange(0.5, input, output);
  XCTAssertEqualObjects(
      [RCTConvert UIColor:@(value)], [RCTUIColor colorWithRed:128. / 255 green:0 blue:128. / 255 alpha:1]); // [macOS]
  value = RCTInterpolateColorInRange(1, input, output);
  XCTAssertEqualObjects([RCTConvert UIColor:@(value)], [RCTUIColor blueColor]); // [macOS]
}

- (void)testStringInterpolation
{
  NSString *pattern = @"M20,20L20,80L80,80L80,20Z";
  NSArray<NSNumber *> *input = @[ @0, @1 ];
  NSArray<NSArray<NSNumber *> *> *output = @[
    @[ @20, @20, @20, @80, @80, @80, @80, @20 ],
    @[ @40, @40, @33, @60, @60, @60, @65, @40 ],
  ];

  NSString *value;
  value = RCTInterpolateString(pattern, 0, input, output, EXTRAPOLATE_TYPE_IDENTITY, EXTRAPOLATE_TYPE_IDENTITY);
  XCTAssertEqualObjects(value, @"M20,20L20,80L80,80L80,20Z");
  value = RCTInterpolateString(pattern, 0.5, input, output, EXTRAPOLATE_TYPE_IDENTITY, EXTRAPOLATE_TYPE_IDENTITY);
  XCTAssertEqualObjects(value, @"M30,30L26.5,70L70,70L72.5,30Z");
}

@end