Rework fetch_bytes and _fetch_pypi_json patches to make testing easier. Various improvements to test_micropip. The main feature is a new fixture
'mock_fetch' with an add_pkg method that takes a package name, a map
from version to requirements, and a choice of platform. This should
hopefully make writing more tests a lot easier (which is good because
we could use more micropip test coverage but we are limited by the
difficulty of writing good tests).

This also adds a fixture to create distinct dummy package names and
enables @pytest.mark.asyncio to handle the async calls rather than
using `asyncio.get_event_loop.run_until_complete`.
#!/usr/bin/env python

from setuptools import find_packages, setup

setup(
    name="micropip",
    version="0.1",
    description="A small version of pip for running in pyodide",
    author="Michael Droettboom",
    author_email="mdroettboom@mozilla.com",
    url="https://github.com/pyodide/pyodide",
    packages=find_packages(
        where=".",
    ),
)

#!/usr/bin/env python

from setuptools import find_packages, setup

setup(
    name="micropip",
    version="0.1",
    description="A small version of pip for running in pyodide",
    author="Michael Droettboom",
    author_email="mdroettboom@mozilla.com",
    url="https://github.com/pyodide/pyodide",
    packages=find_packages(
        where=".",
    ),
)
