New test for error handling

[mkistler]

I created this test to make sure I understood how Java formats it's exceptions, and I figured we may as well add it to the test bucket.

[codecov-io]

Codecov Report

Merging #856 into develop will increase coverage by 20.1%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             develop     #856      +/-   ##
=============================================
+ Coverage      36.17%   56.28%   +20.1%     
- Complexity      1352     2215     +863     
=============================================
  Files            496      496              
  Lines          12021    12021              
  Branches         675      675              
=============================================
+ Hits            4349     6766    +2417     
+ Misses          7350     4862    -2488     
- Partials         322      393      +71

Impacted Files	Coverage Δ	Complexity Δ
..._cloud/discovery/v1/model/QueryNoticesOptions.java	39.44% <0%> (+1.83%)	17% <0%> (ø)	⬇️
...per_cloud/alchemy/v1/model/DisambiguatedLinks.java	2.32% <0%> (+2.32%)	1% <0%> (+1%)	⬆️
...r_cloud/speech_to_text/v1/model/Customization.java	44.18% <0%> (+2.32%)	7% <0%> (+1%)	⬆️
.../conversation/v1/model/UpdateWorkspaceOptions.java	92.68% <0%> (+2.43%)	12% <0%> (+2%)	⬆️
...tson/developer_cloud/alchemy/v1/model/Concept.java	2.5% <0%> (+2.5%)	1% <0%> (+1%)	⬆️
.../watson/developer_cloud/util/DateDeserializer.java	87.17% <0%> (+2.56%)	7% <0%> (+1%)	⬆️
.../conversation/v1/model/CreateWorkspaceOptions.java	97.26% <0%> (+2.73%)	11% <0%> (+2%)	⬆️
...er_cloud/document_conversion/v1/model/Answers.java	8.33% <0%> (+2.77%)	2% <0%> (+1%)	⬆️
...tson/developer_cloud/alchemy/v1/model/Article.java	2.81% <0%> (+2.81%)	1% <0%> (+1%)	⬆️
...anguage_understanding/v1/model/AnalyzeOptions.java	95.16% <0%> (+3.22%)	12% <0%> (ø)	⬇️
... and 246 more

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