From 8e9c24f17590013fce7612a2a7b8a78faec63e32 Mon Sep 17 00:00:00 2001
From: Owen Thomas <owen.thomas@gotinder.com>
Date: Fri, 22 Oct 2021 13:32:13 -0700
Subject: [PATCH] Add tests of crushed PNGs

---
 .../FBSnapshotControllerTests.m               |  31 ++++++++++++++++++
 .../Resources/rect_crushed.png                | Bin 0 -> 3180 bytes
 2 files changed, 31 insertions(+)
 create mode 100644 src/iOSSnapshotTestCaseTests/Resources/rect_crushed.png

diff --git a/src/iOSSnapshotTestCaseTests/FBSnapshotControllerTests.m b/src/iOSSnapshotTestCaseTests/FBSnapshotControllerTests.m
index 9331038..4031be9 100644
--- a/src/iOSSnapshotTestCaseTests/FBSnapshotControllerTests.m
+++ b/src/iOSSnapshotTestCaseTests/FBSnapshotControllerTests.m
@@ -196,6 +196,37 @@ - (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/src/iOSSnapshotTestCaseTests/Resources/rect_crushed.png b/src/iOSSnapshotTestCaseTests/Resources/rect_crushed.png
new file mode 100644
index 0000000000000000000000000000000000000000..dbcf23074e38acf652c4cb07bf578c8523e04680
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