Add tests of crushed PNGs

uber · Dec 11, 2020 · 934dc4f · 934dc4f
1 parent 6eb8656
commit 934dc4f
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Showing 3 changed files with 37 additions and 0 deletions.
diff --git a/FBSnapshotTestCase.xcodeproj/project.pbxproj b/FBSnapshotTestCase.xcodeproj/project.pbxproj
@@ -17,6 +17,8 @@
 		13CBB39E1AEE013900B6ADBA /* FBSnapshotTestCasePlatform.m in Sources */ = {isa = PBXBuildFile; fileRef = 13CBB39C1AEE013900B6ADBA /* FBSnapshotTestCasePlatform.m */; };
 		42F2B74420C0D7A400ABED24 /* rect_shade.png in Resources */ = {isa = PBXBuildFile; fileRef = 42F2B74320C0D7A400ABED24 /* rect_shade.png */; };
 		42F2B74520C0D7A400ABED24 /* rect_shade.png in Resources */ = {isa = PBXBuildFile; fileRef = 42F2B74320C0D7A400ABED24 /* rect_shade.png */; };
+		7810BCD4258373B70005AC4A /* rect_crushed.png in Resources */ = {isa = PBXBuildFile; fileRef = 7810BCD3258373B70005AC4A /* rect_crushed.png */; };
+		7810BCD5258373B70005AC4A /* rect_crushed.png in Resources */ = {isa = PBXBuildFile; fileRef = 7810BCD3258373B70005AC4A /* rect_crushed.png */; };
 		827137841C63AB7000354E42 /* FBSnapshotTestCase.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 8271377A1C63AB6F00354E42 /* FBSnapshotTestCase.framework */; };
 		827137911C63ABE900354E42 /* UIImage+Compare.h in Headers */ = {isa = PBXBuildFile; fileRef = 133564101B59C3F500A4E4BF /* UIImage+Compare.h */; };
 		827137921C63ABF000354E42 /* UIImage+Diff.h in Headers */ = {isa = PBXBuildFile; fileRef = 133564121B59C3F500A4E4BF /* UIImage+Diff.h */; };
@@ -78,6 +80,7 @@
 		13CBB39B1AEE013900B6ADBA /* FBSnapshotTestCasePlatform.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = FBSnapshotTestCasePlatform.h; sourceTree = "<group>"; };
 		13CBB39C1AEE013900B6ADBA /* FBSnapshotTestCasePlatform.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = FBSnapshotTestCasePlatform.m; sourceTree = "<group>"; };
 		42F2B74320C0D7A400ABED24 /* rect_shade.png */ = {isa = PBXFileReference; lastKnownFileType = image.png; path = rect_shade.png; sourceTree = "<group>"; };
+		7810BCD3258373B70005AC4A /* rect_crushed.png */ = {isa = PBXFileReference; lastKnownFileType = image.png; path = rect_crushed.png; sourceTree = "<group>"; };
 		8271377A1C63AB6F00354E42 /* FBSnapshotTestCase.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = FBSnapshotTestCase.framework; sourceTree = BUILT_PRODUCTS_DIR; };
 		827137831C63AB7000354E42 /* FBSnapshotTestCase tvOS Tests.xctest */ = {isa = PBXFileReference; explicitFileType = wrapper.cfbundle; includeInIndex = 0; path = "FBSnapshotTestCase tvOS Tests.xctest"; sourceTree = BUILT_PRODUCTS_DIR; };
 		B31987F01AB782D000B0A900 /* FBSnapshotTestCase.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = FBSnapshotTestCase.framework; sourceTree = BUILT_PRODUCTS_DIR; };
@@ -196,6 +199,7 @@
 			children = (
 				42F2B74320C0D7A400ABED24 /* rect_shade.png */,
 				B76C68271C6BD68100586E5B /* rect.png */,
+				7810BCD3258373B70005AC4A /* rect_crushed.png */,
 				E5C2CD611B1F399A00669887 /* square_with_pixel.png */,
 				B32447D91AB78B5E00B1D6FF /* square_with_text.png */,
 				B32447DA1AB78B5E00B1D6FF /* square-copy.png */,
@@ -384,6 +388,7 @@
 				827137A21C63AC0D00354E42 /* square-copy.png in Resources */,
 				827137A31C63AC0D00354E42 /* square.png in Resources */,
 				827137A11C63AC0900354E42 /* square_with_text.png in Resources */,
+				7810BCD5258373B70005AC4A /* rect_crushed.png in Resources */,
 				42F2B74520C0D7A400ABED24 /* rect_shade.png in Resources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
@@ -404,6 +409,7 @@
 				E5C2CD621B1F399A00669887 /* square_with_pixel.png in Resources */,
 				B32447DE1AB78B5E00B1D6FF /* square.png in Resources */,
 				B32447DD1AB78B5E00B1D6FF /* square-copy.png in Resources */,
+				7810BCD4258373B70005AC4A /* rect_crushed.png in Resources */,
 				42F2B74420C0D7A400ABED24 /* rect_shade.png in Resources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;

diff --git a/FBSnapshotTestCaseTests/FBSnapshotControllerTests.m b/FBSnapshotTestCaseTests/FBSnapshotControllerTests.m
@@ -190,6 +190,37 @@ - (void)testCompareReferenceImageWithLowPixelToleranceShouldMatch
     XCTAssertNil(error);
 }
 
+- (void)testCompareReferenceImageToGrayscaleCrushedImageShouldBeEqual
+{
+    UIImage *referenceImage = [self _bundledImageNamed:@"rect" type:@"png"];
+    XCTAssertNotNil(referenceImage);
+
+    // rect_crushed was made by pngcrush version 1.8.13 with default options as shown below. Reduced file size by 67%
+    // FBSnapshotTestCaseTests$ pngcrush rect.png rect_crushed.png
+    UIImage *testImage = [self _bundledImageNamed:@"rect_crushed" type:@"png"];
+    XCTAssertNotNil(testImage);
+
+    id testClass = nil;
+    FBSnapshotTestController *controller = [[FBSnapshotTestController alloc] initWithTestClass:testClass];
+    NSError *error = nil;
+    XCTAssertTrue([controller compareReferenceImage:referenceImage toImage:testImage overallTolerance:0 error:&error]);
+    XCTAssertNil(error);
+}
+
+- (void)testCompareGrayscaleCrushedImageToReferenceImageShouldBeEqual
+{
+    UIImage *referenceImage = [self _bundledImageNamed:@"rect_crushed" type:@"png"];
+    XCTAssertNotNil(referenceImage);
+    UIImage *testImage = [self _bundledImageNamed:@"rect" type:@"png"];
+    XCTAssertNotNil(testImage);
+
+    id testClass = nil;
+    FBSnapshotTestController *controller = [[FBSnapshotTestController alloc] initWithTestClass:testClass];
+    NSError *error = nil;
+    XCTAssertTrue([controller compareReferenceImage:referenceImage toImage:testImage overallTolerance:0 error:&error]);
+    XCTAssertNil(error);
+}
+
 #pragma mark - Private helper methods
 
 - (UIImage *)_bundledImageNamed:(NSString *)name type:(NSString *)type

diff --git a/FBSnapshotTestCaseTests/rect_crushed.png b/FBSnapshotTestCaseTests/rect_crushed.png