Fix exception thrown in dashboard route test

[benvinegar]

The exception was caused because if you do not send a valid country code, the country name formatter will explode. The mock test data was sending "Canada", "United States", etc. when it should have been sending "CA", "US', etc.

This patch just addresses the input data so that the tests run (and adds some assertions, which should have been there from the beginning). The fundamental problem is still there: the Dashboard will choke if it's fed non-country code values, which seems really brittle. On the plus side the country codes are coming from Cloudflare's request object (vs arbitrary user data).

Fixes #21

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (86e6514) 50.41% compared to head (8874b50) 67.59%.

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #22       +/-   ##
===========================================
+ Coverage   50.41%   67.59%   +17.18%     
===========================================
  Files          18       18               
  Lines        1682     1682               
  Branches       69       94       +25     
===========================================
+ Hits          848     1137      +289     
+ Misses        828      539      -289     
  Partials        6        6               

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