ButtonScrollPerformanceTest

ButtonScrollPerformanceTest.m

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

#import "KSScrollPerformanceDetector.h"
#import "usage.h"

// This is specifically chosen to be the right speed to not trigger optimizations
static const CGFloat KSScrollPerformanceTestsVelocity = -0.15f;

@interface ButtonScrollPerformanceTests : KIFTestCase <KSScrollPerformanceDetectorDelegate>

@property(nonatomic, assign, readwrite) NSInteger droppedFramesLimit;
@property(nonatomic, assign, readwrite) NSInteger frameDropEventsLimit;
@property(nonatomic, strong, nonnull) KSScrollPerformanceDetector *scrollPerformanceDetector;
@property(nonatomic, strong, nonnull) UITableView *tableView;

@end

@implementation ButtonScrollPerformanceTests

- (void)beforeEach {
    self.scrollPerformanceDetector = [[KSScrollPerformanceDetector alloc] init];
    self.scrollPerformanceDetector.delegate = self;
    self.droppedFramesLimit = 3;
    self.frameDropEventsLimit = 3;
}

- (void)setUp {
    [super setUp];
    // Put setup code here. This method is called before the invocation of each test method in the class.
    self.continueAfterFailure = YES;
}

- (void)testButtonPerformance {
    [tester tapViewWithAccessibilityLabel:@"Button"];
    [tester tapViewWithAccessibilityLabel:@"Performance"];
    [self scrollTableToEndWithIdentifier:@"performance-test-table"];
}

- (void)scrollTableToEndWithIdentifier:(NSString *)accessibilityIdentifier {
    UITableView *tableView;
    [tester waitForAccessibilityElement:NULL view:&tableView withIdentifier:accessibilityIdentifier tappable:NO];
    self.tableView = tableView;
    NSIndexPath *lastIndexPath = [NSIndexPath indexPathForRow:[self.tableView numberOfRowsInSection:0] - 1 inSection:0];
    NSArray<NSIndexPath *> *visibleIndexPaths = [self.tableView indexPathsForVisibleRows];

    [self.scrollPerformanceDetector resume];
    while (![visibleIndexPaths containsObject:lastIndexPath]) {
        [tester scrollViewWithAccessibilityIdentifier:accessibilityIdentifier byFractionOfSizeHorizontal:0.0f vertical:KSScrollPerformanceTestsVelocity];
        visibleIndexPaths = [self.tableView indexPathsForVisibleRows];
        [self.scrollPerformanceDetector clearFrameDropCount];
    }
    [self.scrollPerformanceDetector pause];
}

- (void)framesDropped:(NSInteger)framesDroppedCount cumulativeFramesDropped:(NSInteger)cumulativeFramesDropped cumulativeFrameDropEvents:(NSInteger)cumulativeFrameDropEvents {
    if (framesDroppedCount >= self.droppedFramesLimit) {
        XCTFail(@"Past limit for number of dropped frames");
    }

    if (cumulativeFrameDropEvents >= self.frameDropEventsLimit) {
        XCTFail(@"Past limit for number of frame drop events");
    }
}

@end