src/iOSSnapshotTestCaseTests/FBSnapshotControllerTests.m [47:53]:
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    XCTAssertNotNil(testImage);

    id testClass = nil;
    FBSnapshotTestController *controller = [[FBSnapshotTestController alloc] initWithTestClass:testClass];
    NSError *error = nil;
    XCTAssertFalse([controller compareReferenceImage:referenceImage toImage:testImage overallTolerance:0 error:&error]);
    XCTAssertNotNil(error);
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src/iOSSnapshotTestCaseTests/FBSnapshotControllerTests.m [93:100]:
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    XCTAssertNotNil(testImage);

    id testClass = nil;
    FBSnapshotTestController *controller = [[FBSnapshotTestController alloc] initWithTestClass:testClass];
    // With some tolerance these should be considered the same
    NSError *error = nil;
    XCTAssertFalse([controller compareReferenceImage:referenceImage toImage:testImage overallTolerance:0 error:&error]);
    XCTAssertNotNil(error);
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