A few days ago a simple defect came back to me for retesting. On the surface, it seemed like a straightforward retest: a building society reference number was being rejected when it contained special characters such as ‘-’ or ‘/’. Here in the UK, a building society reference typically contains these characters, so the retest was a matter of confirming they were now accepted as valid.

I cross-checked the notes on the fix with the requirements document, and noticed that the maximum number of characters permitted was 20, so I thought I would do a couple of quick boundary tests to ensure this requirement was still being met.
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