test fake attributes

[willmcgugan]

Fixes #1492

Type of changes

• Bug fix
• New feature
• Documentation / docstrings
• Tests
• Other

Checklist

• I've run the latest black with default args on new code.
• I've updated CHANGELOG.md and CONTRIBUTORS.md where appropriate.
• I've added tests for new code.
• I accept that @willmcgugan may be pedantic in the code review.

Description

Please describe your changes here. If this fixes a bug, please link to the issue, if possible.

[codecov]

Codecov Report

Merging #1496 (f613b3e) into master (b267be8) will decrease coverage by 0.05%.
The diff coverage is 73.33%.

@@            Coverage Diff             @@
##           master    #1496      +/-   ##
==========================================
- Coverage   99.79%   99.73%   -0.06%     
==========================================
  Files          71       71              
  Lines        6753     6765      +12     
==========================================
+ Hits         6739     6747       +8     
- Misses         14       18       +4     

Flag	Coverage Δ
unittests	99.73% <73.33%> (-0.06%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
rich/pretty.py	98.74% <73.33%> (-1.26%)	⬇️

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