DEVX-6472: Adding 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

• Adds three tests to verify_test.rb:
  • One to check an blacklist error response with network but not request_id
  • One to check an blacklist error response with request_id but not network
  • One to check an blacklist error response with request_id and network

[codecov-commenter]

Codecov Report

Merging #241 (7091849) into dev (4169c8a) will not change coverage. The diff coverage is n/a.

:exclamation: Current head 7091849 differs from pull request most recent head 5973806. Consider uploading reports for the commit 5973806 to get more accurate results

@@           Coverage Diff           @@
##              dev     #241   +/-   ##
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  Coverage   97.71%   97.71%           
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  Files          70       70           
  Lines        1401     1401           
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  Hits         1369     1369           
  Misses         32       32           

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[superchilled]

LGTM

@dragonmantank GitHub is saying that you requested changes, but I can't see what.