DEVX-6472: Adding more Verify tests for Blacklist error response

[superchilled]

Reason for this PR

The Verify API has a new possible error response for the https://api.nexmo.com/verify/json, which can return a response with and without certain properties in the response body. This PR is to ensure that the existing implementation of Verify in the Ruby SDK handles the various permutations of this response correctly. See this JIRA ticket for additional context.

What this PR does

• Following the addition of the tests for the verify endpoint already added in #241, this PR adds three more tests to verify_test.rb for the for psd2 endpoint:
  • One to check an blacklist error response for psd2 endpoint with network but not request_id
  • One to check an blacklist error response for psd2 endpoinwith request_id but not network
  • One to check an blacklist error response for psd2 endpoinwith request_id and network

[codecov-commenter]

Codecov Report

Merging #246 (fe1b55d) into dev (0c4059b) will not change coverage. The diff coverage is n/a.

:exclamation: Current head fe1b55d differs from pull request most recent head 00aca9d. Consider uploading reports for the commit 00aca9d to get more accurate results

@@           Coverage Diff           @@
##              dev     #246   +/-   ##
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  Coverage   97.71%   97.71%           
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  Files          70       70           
  Lines        1400     1400           
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  Hits         1368     1368           
  Misses         32       32           

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