Comprehensive tests for `ManagedNumberField`

[knod]

This is what I've got so far for <ManagedNumberField> desired behavior.

Valid number: A positive decimal or whole number, 0, or a blank field. Permitted invalid input: Numbers with multiple decimal points.

• [ ] User clicks on field with '0' in it:
  • [ ] Field goes blank, ready for input
• [ ] User clicks on field with valid number in it:
  • [ ] Nothing changes
• [ ] User types a valid number in the field:
  • [ ] Typing shows up as entered
• [ ] User types a valid number in the field and then leaves the field:
  • [ ] Valid value is shown as decimal value
  • [ ] (Valid value is stored permanently)
• [ ] User types an INVALID number in the field:
  • [ ] Typing shows up as entered
  • [ ] Field gives 'invalid value' feedback (turns red)
• [ ] User types in an INVALID number and then leaves the field
  • [ ] The last valid field value previously entered is shown (last valid value typed, or last valid value left there?)
  • [ ] (Invalid value is discarded)
• [ ] User types 0 in a field:
  • [ ] Typing shows up as entered
• [ ] User deletes all items in the field
  • [ ] Input does not turn red
• [ ] User deletes all numbers in the field then leaves the field
  • [ ] Field shows '0'
  • [ ] (0 is stored permanently as the value)

Which of these are done already?

[snyderc]

Of what's currently here, the dev branch currently contains this functionality, except for:

User types an INVALID number in the field User types in an INVALID number and then leaves the field

For the above two -- per the most recent PRs, when the user attempts to enter an invalid value (e.g. a negative sign or a letter), the last field value previously entered does not change. The negative sign/letter does not get put into the input at all.

I'll work on making sure there are complete tests for these behaviors.

[knod]

@snyderc : Thanks! Also, if you have a sec, if you could put check marks in the ones that are already done, it would show it in the issue list view so others can quickly know where it's at.

[snyderc]

Do you want me to use the checkboxes for when the tests are completed, or just when the code exhibits these behaviors? I will assume the first one.

[knod]

Yeah, @snyderc, the first one - check them off when the tests for that behavior have been completed.