Remove duplicate unit/functional test cases and make Unit tests only check for basic import/runtime errors

[loredous]

Is your feature request related to a problem? Please describe.
Currently some unit tests for parsers duplicate functionality from the functional test. We want to ensure that tests are properly separated by function.

Describe the solution you'd like
Unit tests for the parsers should be rewritten to be a more generic test that automatically covers all built-in parser code, ensures each module is of the proper type and follows the proper interface without throwing exceptions.