WIP tests for venv

.gitignore

@@ -0,0 +1,8 @@
+.pytest_cache/
+.tox/
+build/
+/module.*
+/setup.py
+/test_foo.py
+/tox.ini
+/venv/

tests-venv

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+#!/bin/sh -eux
+
+# TODO set this from outside depending on the package
+VERSION=3.7
+PYTHON=python$VERSION
+
+# clean from possible older runs
+rm -rf venv .tox __pycache__ .pytest* test_*.py *.pyx *.c *.so || :
+
+# check the we can create the venv
+$PYTHON -m venv venv
+
+# and activate it
+source venv/bin/activate
+
+# run python in it
+python -c 'import sys; print(sys.version)' | head -n1 | grep $VERSION
+
+# install packages with pip
+python -m pip install pytest
+
+# run tests
+cat > test_foo.py << EOF
+def test_foo():
+    assert True
+EOF
+
+python -m pytest -v test_foo.py
+
+# check that we can do extension modules
+cat > module.pyx << EOF
+cdef int add(int a, int b):
+    return a + b
+
+def two():
+    cdef int a = 1
+    cdef int b = 1
+    return add(a, b)
+EOF
+
+cat > setup.py << EOF
+from setuptools import setup
+from Cython.Build import cythonize
+
+setup(ext_modules = cythonize('module.pyx'))
+EOF
+
+python -m pip install Cython
+python setup.py build_ext --inplace
+
+python -c 'import module; print(module.two())' | grep '^2$'
+
+# deactivate has unset variable, it's known
+set +u
+deactivate
+set -u
+
+# use it with tox
+cat > tox.ini << EOF
+[tox]
+skipsdist = True
+[testenv]
+deps = pytest
+commands = python -m pytest -v test_foo.py
+EOF
+
+tox -e py${VERSION/./}