Add a test that client raises the proper exception when parsing an error status response.

[rectalogic]

This test passes in v4.6.3 but is failing in v4.6.4 due to #571

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[codecov-io]

Codecov Report

Merging #574 into master will increase coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #574      +/-   ##
==========================================
+ Coverage   65.62%   65.67%   +0.05%     
==========================================
  Files         103      103              
  Lines       25601    25599       -2     
==========================================
+ Hits        16801    16813      +12     
+ Misses       8800     8786      -14

Impacted Files	Coverage Δ
src/saml2/entity.py	85.49% <ø> (+0.26%)	⬆️
src/saml2/validate.py	77.64% <0%> (+0.39%)	⬆️
src/saml2/client_base.py	77.34% <0%> (+0.48%)	⬆️
src/saml2/time_util.py	87.42% <0%> (+0.59%)	⬆️
src/saml2/response.py	73.79% <0%> (+1.01%)	⬆️

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[c00kiemon5ter]

Thank you, both for the catch and the complete PR with the test. I'm preparing a new release with this fix now.

[c00kiemon5ter]

v4.6.5 is out with this fix.