We want to move to py.test so that:

• we can select to only run parser tests with one tree builder (and tree walker tests with only one tree walker, etc.)
• we can make use of the plugin API to create a means of dumping test failures and build support for expected failures into the testsuites from html5lib-tests
• it is easier to create nicer error messages
• better support for skipped and expected failures so we can walk towards having a constant number of tests across all platforms, optionally skipped

https://github.com/gsnedders/html5lib-python/tree/expected_failures_pytest is my current WIP branch implementing this.

Status:

Needed to fix failures:

• Make sure tests from generators run in a deterministic order
• Use pytest-expect

The rest:

• Move tokenizer and serialiser tests over to generating test objects from the JSON files.
• Refactor support.py.
• Check the submodule is imported (see Warn on missing testdata submodule #122).