The included "GenerateStressTest" program will generate files of DCPU assembly that represent all possible instructions in all forms. It should be assembler-ambiguous, and all assemblers should be able to assemble is with no errors, only warnings (for redundancy and literal assignment).
Each file is less than 10,001 lines long. If you wish to include your results, submit a pull request and it will be added.
Also included are several more focused test files that may not be assembler-ambiguous and may include intentionally errorneous code.