old_contents: from invoke import task, Collection
  from invocations.packaging import release
  
  
  # TODO: once this stuff is stable and I start switching my other projects to be
  # pytest-oriented, move this into invocations somehow.
  @task
  def test(c):
      """
      Run verbose pytests.
      """
      c.run("pytest --verbose --color=yes")
  
  @task
  def coverage(c, html=True):
      """
      Run coverage with coverage.py.
      """
      # NOTE: this MUST use coverage itself, and not pytest-cov, because the
      # latter is apparently unable to prevent pytest plugins from being loaded
      # before pytest-cov itself is able to start up coverage.py! The result is
      # that coverage _always_ skips over all module level code, i.e. constants,
      # 'def' lines, etc. Running coverage as the "outer" layer avoids this
      # problem, thus no need for pytest-cov.
      # NOTE: this does NOT hold true for NON-PYTEST code, so
      # pytest-relaxed-USING modules can happily use pytest-cov.
      c.run("coverage run --source=pytest_relaxed -m pytest")
      if html:
          c.run("coverage html")
          c.run("open htmlcov/index.html")
  
  
  ns = Collection(
      coverage,
      test,
      packaging=release,
  )
  ns.configure({
  })
  
new_contents: from invoke import task, Collection
  from invocations.packaging import release
  from invocations import pytest as pytests
  
  
  @task
  def coverage(c, html=True):
      """
      Run coverage with coverage.py.
      """
      # NOTE: this MUST use coverage itself, and not pytest-cov, because the
      # latter is apparently unable to prevent pytest plugins from being loaded
      # before pytest-cov itself is able to start up coverage.py! The result is
      # that coverage _always_ skips over all module level code, i.e. constants,
      # 'def' lines, etc. Running coverage as the "outer" layer avoids this
      # problem, thus no need for pytest-cov.
      # NOTE: this does NOT hold true for NON-PYTEST code, so
      # pytest-relaxed-USING modules can happily use pytest-cov.
      c.run("coverage run --source=pytest_relaxed -m pytest")
      if html:
          c.run("coverage html")
          c.run("open htmlcov/index.html")
  
  
  ns = Collection(
      coverage,
      pytests.test,
      packaging=release,
  )
  
subject: Use new invocations pytest helper