totalIntegers: Provide clearer test names

[mao-sz]

Because

"works ..." doesn't communicate very well exactly what it means. Some learners have gotten confused with the expected behaviour (e.g. ESL speaker so "integer" isn't as immediately obvious).

This PR

• Renames test titles to be more explicit

Issue

Closes #XXXXX

Additional Information

Pull Request Requirements

• I have thoroughly read and understand The Odin Project Contributing Guide
• The title of this PR follows the location of change: brief description of change format, e.g. 01_helloWorld: Update test cases
• The Because section summarizes the reason for this PR
• The This PR section has a bullet point list describing the changes in this PR
• If this PR addresses an open issue, it is linked in the Issue section
• If this PR includes any changes that affect the solution of an exercise, I've also updated the solution in the /solutions folder