Verifies BigDecimal support does not have a regression

[johnjaylward]

Fixes #531
Add test result to confirm that #531 is working in latest version. No code changes needed.

A new release should be scheduled so the fix can be used by people using the MAVEN artifacts.

[stleary]

What problem does this code solve?
There was a question about whether BigDecimal support had introduced an unexpected regression. Added unit tests to confirm this was not the case.

Risks
None

Changes to the API?
No

Will this require a new release?
No

Should the documentation be updated?
No

Does it break the unit tests?
No

Was any code refactored in this commit?
No

Review status
APPROVED
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