Cleanup Tests and Warnings in them

[Morphclue]

Description

I've cleanuped the tests a bit and fixed some warnings. Jest only spitted out the warning that toBeEmpty() is deprecated and toBeDOMElement() should be used instead, but i also refactored other tests in this PR. Mainly renderStatsCard.test.js, because it had multiple duplicate code-fragments that should be refactored for faster readability.

Code

• Exchanged deprecated method
• Added expectColors() to avoid duplicate code fragments
• Removed unused imports
• Removed unused variables

Types of changes

• Enhancement
• Refactor

Reference

• toBeDOMElement
• #705 (only minor improvements)

[vercel[bot]]

@distrustME is attempting to deploy a commit to the github readme stats Team on Vercel.

A member of the Team first needs to authorize it.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (7d4c49b) 98.02% compared to head (80c7163) 98.02%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1205   +/-   ##
=======================================
  Coverage   98.02%   98.02%           
=======================================
  Files          27       27           
  Lines        6275     6275           
  Branches      549      549           
=======================================
  Hits         6151     6151           
  Misses        121      121           
  Partials        3        3           

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.