This sounds like entering fuzzy testing matters; testing just this case would be trivial, but it wouldn't bring much benefit, we should rather fuzzy testing with random input. Unfortunately that is also a lot more complicate. That said, if Drew wants to add a test it's fine, I didn't consider it critical, because this is one of those cases you're unlikely to hit again, while you may hit a thousands others that fuzzy testing may discover while this test would ignore.
Bug 1587867 Comment 28 Edit History
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This sounds like entering fuzzy testing matters; testing just this case would be trivial, but it wouldn't bring much benefit, we should rather fuzzy testing with random input. Unfortunately that is also a lot more complicate. That said, if Drew wants to add a test it's fine. I didn't consider it critical, because this is one of those cases you're unlikely to hit again, while you may hit a thousands others that fuzzy testing may discover while this test would ignore.