src/iOSSnapshotTestCaseTests/FBSnapshotControllerTests.m [75:83]:
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    UIImage *referenceImage = [self _bundledImageNamed:@"square" type:@"png"];
    XCTAssertNotNil(referenceImage);
    UIImage *testImage = [self _bundledImageNamed:@"square_with_pixel" type:@"png"];
    XCTAssertNotNil(testImage);

    id testClass = nil;
    FBSnapshotTestController *controller = [[FBSnapshotTestController alloc] initWithTestClass:testClass];
    // With some tolerance these should be considered the same
    NSError *error = nil;
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src/iOSSnapshotTestCaseTests/FBSnapshotControllerTests.m [170:178]:
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    UIImage *referenceImage = [self _bundledImageNamed:@"square" type:@"png"];
    XCTAssertNotNil(referenceImage);
    UIImage *testImage = [self _bundledImageNamed:@"square_with_pixel" type:@"png"];
    XCTAssertNotNil(testImage);

    id testClass = nil;
    FBSnapshotTestController *controller = [[FBSnapshotTestController alloc] initWithTestClass:testClass];
    // With virtually no margin for error, this should fail to be equal
    NSError *error = nil;
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