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Add imprecise comparison variants to iOSSnapshotTestCase extension
This adds variants of the `SnapshotVerify*(...)` methods that allow for imprecise comparisons, i.e. using the `perPixelTolerance` and `overallTolerance` parameters. ## Why is this necessary? Adding tolerances has been a highly requested feature (see #63) to work around some simulator changes introduced in iOS 13. Historically the simulator has supported CPU-based rendering, giving us very stable image representations of views that we can compare pixel-by-pixel. Unfortunately, with iOS 13, Apple changed the simulator to use exclusively GPU-based rendering, which means that the resulting snapshots may differ slightly across machines (see uber/ios-snapshot-test-case#109). The negative effects of this were mitigated in iOSSnapshotTestCase by adding two tolerances: a **per-pixel tolerance** that controls how close in color two pixels need to be to count as unchanged and an **overall tolerance** that controls what portion of pixels between two images need to be the same (based on the per-pixel calculation) for the images to be considered unchanged. Setting these tolerances to non-zero values enables engineers to record tests on one machine and run them on another without worrying about the tests failing due to differences in GPU rendering.
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| Original file line number | Diff line number | Diff line change |
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| // | ||
| // Copyright 2023 Block Inc. | ||
| // | ||
| // 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. | ||
| // | ||
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| @import AccessibilitySnapshot; | ||
| @import FBSnapshotTestCase; | ||
| @import XCTest; | ||
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| @interface ImpreciseObjectiveCTests : FBSnapshotTestCase | ||
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| @end | ||
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| @implementation ImpreciseObjectiveCTests | ||
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| - (void)setUp; | ||
| { | ||
| [super setUp]; | ||
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| self.fileNameOptions = FBSnapshotTestCaseFileNameIncludeOptionOS | FBSnapshotTestCaseFileNameIncludeOptionScreenSize | FBSnapshotTestCaseFileNameIncludeOptionScreenScale; | ||
| } | ||
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| - (void)testSimpleView; | ||
| { | ||
| UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 200, 50)]; | ||
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| UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(25, 10, 150, 30)]; | ||
| label.text = @"Objective-C Snapshot"; | ||
| label.textColor = [UIColor redColor]; | ||
| label.font = [UIFont systemFontOfSize:12]; | ||
| label.textAlignment = NSTextAlignmentCenter; | ||
| [view addSubview:label]; | ||
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| SnapshotImpreciseVerifyAccessibility(view, nil, 0, 0); | ||
| } | ||
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| - (void)testSimpleViewWithIdentifier; | ||
| { | ||
| UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 200, 50)]; | ||
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| UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(25, 10, 150, 30)]; | ||
| label.text = @"Objective-C Snapshot"; | ||
| label.textColor = [UIColor redColor]; | ||
| label.font = [UIFont systemFontOfSize:12]; | ||
| label.textAlignment = NSTextAlignmentCenter; | ||
| [view addSubview:label]; | ||
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| SnapshotImpreciseVerifyAccessibility(view, @"identifier", 0, 0); | ||
| } | ||
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| - (void)testSimpleViewWithActivationPointAlways; | ||
| { | ||
| UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 200, 50)]; | ||
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| UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(25, 10, 150, 30)]; | ||
| label.text = @"Objective-C Snapshot"; | ||
| label.textColor = [UIColor redColor]; | ||
| label.font = [UIFont systemFontOfSize:12]; | ||
| label.textAlignment = NSTextAlignmentCenter; | ||
| [view addSubview:label]; | ||
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| SnapshotImpreciseVerifyAccessibilityWithOptions(view, nil, YES, YES, 0, 0); | ||
| } | ||
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| - (void)testViewWithInvertedColors; | ||
| { | ||
| UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 100, 100)]; | ||
| [view setBackgroundColor:[UIColor redColor]]; | ||
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| UIView *subview = [[UIView alloc] initWithFrame:CGRectMake(25, 25, 50, 50)]; | ||
| [subview setBackgroundColor:[UIColor greenColor]]; | ||
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| [subview setAccessibilityIgnoresInvertColors:YES]; | ||
| [view addSubview:subview]; | ||
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| SnapshotImpreciseVerifyWithInvertedColors(view, nil, 0, 0); | ||
| } | ||
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| @end |
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63 changes: 63 additions & 0 deletions
63
...litySnapshot/iOSSnapshotTestCase/ObjC/include/FBSnapshotTestCase_ImpreciseAccessibility.h
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,63 @@ | ||
| // | ||
| // Copyright 2023 Block Inc. | ||
| // | ||
| // 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. | ||
| // | ||
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| #define SnapshotImpreciseVerifyAccessibility(view__, identifier__, perPixelTolerance__, overallTolerance__)\ | ||
| {\ | ||
| _Pragma("clang diagnostic push")\ | ||
| _Pragma("clang diagnostic ignored \"-Wundeclared-selector\"")\ | ||
| SEL selector = @selector(snapshotVerifyAccessibility:identifier:perPixelTolerance:overallTolerance:);\ | ||
| _Pragma("clang diagnostic pop")\ | ||
| typedef NSString * (*SnapshotMethod)(id, SEL, UIView *, NSString *, CGFloat, CGFloat);\ | ||
| SnapshotMethod snapshotVerifyAccessibility = (SnapshotMethod)[self methodForSelector:selector];\ | ||
| NSString *errorDescription = snapshotVerifyAccessibility(self, selector, view__, identifier__ ?: @"", perPixelTolerance__, overallTolerance__);\ | ||
| if (errorDescription == nil) {\ | ||
| XCTAssertTrue(YES);\ | ||
| } else {\ | ||
| XCTFail("%@", errorDescription);\ | ||
| }\ | ||
| } | ||
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| #define SnapshotImpreciseVerifyAccessibilityWithOptions(view__, identifier__, showActivationPoints__, useMonochromeSnapshot__, perPixelTolerance__, overallTolerance__)\ | ||
| {\ | ||
| _Pragma("clang diagnostic push")\ | ||
| _Pragma("clang diagnostic ignored \"-Wundeclared-selector\"")\ | ||
| SEL selector = @selector(snapshotVerifyAccessibility:identifier:showActivationPoints:useMonochromeSnapshot:perPixelTolerance:overallTolerance:);\ | ||
| _Pragma("clang diagnostic pop")\ | ||
| typedef NSString * (*SnapshotMethod)(id, SEL, UIView *, NSString *, BOOL, BOOL, CGFloat, CGFloat);\ | ||
| SnapshotMethod snapshotVerifyAccessibility = (SnapshotMethod)[self methodForSelector:selector];\ | ||
| NSString *errorDescription = snapshotVerifyAccessibility(self, selector, view__, identifier__ ?: @"", showActivationPoints__, useMonochromeSnapshot__, perPixelTolerance__, overallTolerance__);\ | ||
| if (errorDescription == nil) {\ | ||
| XCTAssertTrue(YES);\ | ||
| } else {\ | ||
| XCTFail("%@", errorDescription);\ | ||
| }\ | ||
| } | ||
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| #define SnapshotImpreciseVerifyWithInvertedColors(view__, identifier__, perPixelTolerance__, overallTolerance__)\ | ||
| {\ | ||
| _Pragma("clang diagnostic push")\ | ||
| _Pragma("clang diagnostic ignored \"-Wundeclared-selector\"")\ | ||
| SEL selector = @selector(snapshotVerifyWithInvertedColors:identifier:perPixelTolerance:overallTolerance:);\ | ||
| _Pragma("clang diagnostic pop")\ | ||
| typedef NSString * (*SnapshotMethod)(id, SEL, UIView *, NSString *, CGFloat, CGFloat);\ | ||
| SnapshotMethod snapshotVerifyWithInvertedColors = (SnapshotMethod)[self methodForSelector:selector];\ | ||
| NSString *errorDescription = snapshotVerifyWithInvertedColors(self, selector, view__, identifier__ ?: @"", perPixelTolerance__, overallTolerance__);\ | ||
| if (errorDescription == nil) {\ | ||
| XCTAssertTrue(YES);\ | ||
| } else {\ | ||
| XCTFail("%@", errorDescription);\ | ||
| }\ | ||
| } |
2 changes: 1 addition & 1 deletion
2
...es/AccessibilitySnapshot/iOSSnapshotTestCase/Swift/FBSnapshotTestCase+Accessibility.swift
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