fix: Fix the order of the files when running the tests

[patrickalima98]

Proposed changes

Fix order of files when running test, now tests will run according to the order of
files in directory.

See more in this question

Types of changes

What types of changes does your code introduce?

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist

• I have read the CONTRIBUTING doc
• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works.
• I have added necessary documentation (if appropriate)

[coveralls]

Coverage remained the same at 81.128% when pulling 8128778 on patrickalima98:develop into 4a461e2 on adonisjs:develop.