old_contents: import re
  from pathlib import Path
  
  from setuptools import setup, find_packages
  
  
  def find_version():
      version_file = (
          Path(__file__)
          .parent.joinpath("pytest_asyncio", "__init__.py")
          .read_text()
      )
      version_match = re.search(
          r"^__version__ = ['\"]([^'\"]*)['\"]", version_file, re.M
      )
      if version_match:
          return version_match.group(1)
  
      raise RuntimeError("Unable to find version string.")
  
  
  setup(
      name="pytest-asyncio",
      version=find_version(),
      packages=find_packages(),
      url="https://github.com/pytest-dev/pytest-asyncio",
      license="Apache 2.0",
      author="Tin Tvrtković",
      author_email="tinchester@gmail.com",
      description="Pytest support for asyncio.",
      long_description=Path(__file__).parent.joinpath("README.rst").read_text(),
      classifiers=[
          "Development Status :: 4 - Beta",
          "Intended Audience :: Developers",
          "License :: OSI Approved :: Apache Software License",
          "Programming Language :: Python :: 3.5",
          "Programming Language :: Python :: 3.6",
          "Programming Language :: Python :: 3.7",
          "Topic :: Software Development :: Testing",
          "Framework :: Pytest",
      ],
      python_requires=">= 3.5",
      install_requires=["pytest >= 3.6.0"],
      extras_require={
          ':python_version == "3.5"': "async_generator >= 1.3",
          "testing": [
              "coverage",
              "async_generator >= 1.3",
              "hypothesis >= 3.64",
          ],
      },
      entry_points={"pytest11": ["asyncio = pytest_asyncio.plugin"]},
  )
  
new_contents: import re
  from pathlib import Path
  
  from setuptools import setup, find_packages
  
  
  def find_version():
      version_file = (
          Path(__file__)
          .parent.joinpath("pytest_asyncio", "__init__.py")
          .read_text()
      )
      version_match = re.search(
          r"^__version__ = ['\"]([^'\"]*)['\"]", version_file, re.M
      )
      if version_match:
          return version_match.group(1)
  
      raise RuntimeError("Unable to find version string.")
  
  
  setup(
      name="pytest-asyncio",
      version=find_version(),
      packages=find_packages(),
      url="https://github.com/pytest-dev/pytest-asyncio",
      license="Apache 2.0",
      author="Tin Tvrtković",
      author_email="tinchester@gmail.com",
      description="Pytest support for asyncio.",
      long_description=Path(__file__).parent.joinpath("README.rst").read_text(),
      classifiers=[
          "Development Status :: 4 - Beta",
          "Intended Audience :: Developers",
          "License :: OSI Approved :: Apache Software License",
          "Programming Language :: Python :: 3.5",
          "Programming Language :: Python :: 3.6",
          "Programming Language :: Python :: 3.7",
          "Topic :: Software Development :: Testing",
          "Framework :: Pytest",
      ],
      python_requires=">= 3.5",
      install_requires=["pytest >= 3.6.0, < 5.4.0"],
      extras_require={
          ':python_version == "3.5"': "async_generator >= 1.3",
          "testing": [
              "coverage",
              "async_generator >= 1.3",
              "hypothesis >= 3.64",
          ],
      },
      entry_points={"pytest11": ["asyncio = pytest_asyncio.plugin"]},
  )
  
subject: Add max supported pytest version to < 5.4.0 to prevent fails until #141 is fixed.