gcr: Refactor the parser tests
gcr: Refactor the parser tests

 * Make one test per file, and give them descriptive names.
 * Make the tests quieter as well.

Distrotech/gcr,Distrotech/gcr,stefwalter/gcr,Distrotech/gcr,stefwalter/gcr,stefwalter/gcr,stefwalter/gcr,Distrotech/gcr