add error to message in test helper func

[petar-dambovaliev]

PR Type

Other

PR Checklist

Check your PR fulfills the following:

• A changelog entry has been made for the appropriate packages.
• Format code with the latest stable rustfmt

Overview

Add error to panic

[codecov]

Codecov Report

Merging #1812 (4ede216) into master (d0c6ca7) will increase coverage by 0.00%.
The diff coverage is 50.00%.

@@           Coverage Diff           @@
##           master    #1812   +/-   ##
=======================================
  Coverage   53.62%   53.63%           
=======================================
  Files         133      134    +1     
  Lines       12348    12349    +1     
=======================================
+ Hits         6622     6623    +1     
  Misses       5726     5726           

Impacted Files	Coverage Δ
src/test.rs	88.63% <50.00%> (ø)
actix-http/src/header/common/accept_language.rs
actix-http/src/header/common/if_match.rs
actix-http/src/header/common/if_modified_since.rs	0.00% <0.00%> (ø)
actix-http/src/header/common/accept_charset.rs	0.00% <0.00%> (ø)
actix-http/src/header/common/last_modified.rs	0.00% <0.00%> (ø)
actix-http/src/ws/mask.rs	2.63% <0.00%> (+2.63%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update d0c6ca7...4ede216. Read the comment docs.

[JohnTitor]

Looks good, thanks!