The tests are split in several categories:

0x - basic tests
1x - Papery::Pulp tests
2x - Papery::Analyzer tests
3x - Papery::Processor tests
4x - Papery::Renderer tests
5x - Papery hooks tests
9x - functional tests

Test files are stored in several directories:

t/analyzer  - files for Papery::Analyzer::* tests
t/processor - files for Papery::Processor::* tests
t/renderer  - files for Papery::Renderer::* tests
t/site      - files for complete site generation tests

