src/iOSSnapshotTestCaseCore/FBSnapshotTestCase.m [184:189]:
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      referenceImagesDirectory:(NSString *)referenceImagesDirectory
            imageDiffDirectory:(NSString *)imageDiffDirectory
                    identifier:(NSString *)identifier
             perPixelTolerance:(CGFloat)perPixelTolerance
              overallTolerance:(CGFloat)overallTolerance
                         error:(NSError **)errorPtr
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src/iOSSnapshotTestCaseCore/FBSnapshotTestCase.m [217:222]:
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     referenceImagesDirectory:(NSString *)referenceImagesDirectory
           imageDiffDirectory:(NSString *)imageDiffDirectory
                   identifier:(NSString *)identifier
            perPixelTolerance:(CGFloat)perPixelTolerance
             overallTolerance:(CGFloat)overallTolerance
                        error:(NSError **)errorPtr
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