add test case for #1406

[folt]

add test case for #1406

[codecov]

Codecov Report

Merging #1412 (d58f408) into master (621019c) will increase coverage by 0.19%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1412      +/-   ##
==========================================
+ Coverage   87.54%   87.73%   +0.19%     
==========================================
  Files          29       29              
  Lines        1574     1574              
  Branches      221      220       -1     
==========================================
+ Hits         1378     1381       +3     
+ Misses        145      142       -3     
  Partials       51       51              

Impacted Files	Coverage Δ
debug_toolbar/panels/request.py	100.00% <100.00%> (ø)
debug_toolbar/panels/profiling.py	89.28% <0.00%> (+2.67%)	⬆️

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