updated corner case unit test for JS model

pertains to #15

per [ralph's review](/siq/mesh/pull/23#issuecomment-13311086), bullet #8
added assertion to test_model_consistency.js

per [ralph's review](/siq/mesh/pull/23#issuecomment-13311086), bullet #9
added missing semi-colon to test_model_consistency

per [ralph's review](/siq/mesh/pull/23#issuecomment-13311086), bullet