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Edge cases

note

This functionality is only available on Tweak Max. Compare the plans here.

Edge cases fills a field, or a whole form, with the data that breaks apps: very long text, accents, emoji, right-to-left scripts, odd numbers and dates, awkward emails and broken files. Pick the data, click, and see how the page and the server cope.

Using it​

  1. Turn it on in Settings > Toolbox: it is off by default.

  2. Open the toolbox and click the arrow next to the edge cases button.

  3. Pick the data from Length, Characters, Numbers, Dates, Formats or Files, or search for it. Picking it arms the tool, and the button's tag shows what is loaded.

    The Edge cases menu with its search field and the Length section

  4. Click a field to fill it. Click anywhere else inside a form to fill every field the data fits.

  5. Click the edge cases button again, or press Esc, to put the tool away.

Example: a 256-character first name​

Pick 256 characters and click the first name of the shop's newsletter form. The value is counted text (--------10--------20…), so wherever it is cut short, it tells you at which character.

The newsletter form with the first name filled with 256 counted characters and a green outline

Example: the whole form in right-to-left text​

Pick Right-to-left and click the form's heading. Both text fields are filled with Arabic and Hebrew at once.

The whole newsletter form outlined in green, both fields filled with right-to-left text

Good to know​

  • A green outline means the field holds exactly the data. Amber means the browser changed it, for example letters typed into a number or date field: the server will never see that value.
  • The data is fixed, not random, so a bug you find comes back the same way every time.
  • Values are entered the way a paste is, so the page reacts as it would to a user. A field's maximum length does not stop them.
  • File cases (an empty file, a text file named .png, a 10 MB file…) go into a file field, or the drop zone around it.
  • Buttons, links and checkboxes still work with the tool out, so you can fill and submit without putting it away.
  • To send values the page's own checks would refuse, use Skip form validation.

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