src/iOSSnapshotTestCaseTests/FBSnapshotControllerTests.m [114:123]:
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        id testClass = nil;
        FBSnapshotTestController *controller = [[FBSnapshotTestController alloc] initWithTestClass:testClass];
        [controller setFileNameOptions:options];

        NSString *referenceImagesDirectory = @"/dev/null/";
        [controller setReferenceImagesDirectory:referenceImagesDirectory];
        NSError *error = nil;
        SEL selector = @selector(fileNameOptions);
        [controller referenceImageForSelector:selector identifier:@"" error:&error];
        XCTAssertNotNil(error);
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src/iOSSnapshotTestCaseTests/FBSnapshotControllerTests.m [142:151]:
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    id testClass = nil;
    FBSnapshotTestController *controller = [[FBSnapshotTestController alloc] initWithTestClass:testClass];
    [controller setFileNameOptions:options];

    NSString *referenceImagesDirectory = @"/dev/null/";
    [controller setReferenceImagesDirectory:referenceImagesDirectory];
    NSError *error = nil;
    SEL selector = @selector(fileNameOptions);
    [controller referenceImageForSelector:selector identifier:@"" error:&error];
    XCTAssertNotNil(error);
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