Added better expected error messages to deformity tests

[ml-evs]

Closes #583

[codecov]

Codecov Report

Merging #584 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #584   +/-   ##
=======================================
  Coverage   91.77%   91.77%           
=======================================
  Files          62       62           
  Lines        3222     3222           
=======================================
  Hits         2957     2957           
  Misses        265      265           

Flag	Coverage Δ
project	91.77% <ø> (ø)
validator	64.61% <ø> (ø)

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[CasperWA]

Great work my robot friend 😅 (seems like this was very much a robotic task to an extent...)

[ml-evs]

Great work my robot friend sweat_smile (seems like this was very much a robotic task to an extent...)

Story of my life...