Only test with html5lib when extensive is set

Author: aucampia

tox.ini

@@ -15,12 +15,12 @@ setenv =
     COVERAGE_FILE = {env:COVERAGE_FILE:{toxinidir}/.coverage.{envname}}
     MYPY_CACHE_DIR = {envdir}/.mypy_cache
     docs: POETRY_ARGS_docs = --only=docs
-    extensive: POETRY_ARGS_extensive = --extras=berkeleydb --extras=networkx
+    extensive: POETRY_ARGS_extensive = --extras=berkeleydb --extras=networkx --extras=html
     lxml: POETRY_ARGS_lxml = --extras=lxml
 commands_pre =
     py3{7,8,9,10,11}: python -c 'import os; print("\n".join(f"{key}={value}" for key, value in os.environ.items()))'
     py3{7,8,9,10,11}: poetry lock --check
-    py3{7,8,9,10,11}: poetry install --no-root --only=main --only=dev --only=flake8 --only=tests --extras=html  {env:POETRY_ARGS_docs:} {env:POETRY_ARGS_extensive:} {env:POETRY_ARGS_lxml:} {env:POETRY_ARGS:} --sync
+    py3{7,8,9,10,11}: poetry install --no-root --only=main --only=dev --only=flake8 --only=tests {env:POETRY_ARGS_docs:} {env:POETRY_ARGS_extensive:} {env:POETRY_ARGS_lxml:} {env:POETRY_ARGS:} --sync
 commands =
     {env:TOX_EXTRA_COMMAND:}
     {env:TOX_MYPY_COMMAND:poetry run python -m mypy --show-error-context --show-error-codes --junit-xml=test_reports/{env:TOX_JUNIT_XML_PREFIX:}mypy-junit.xml}