remove clean files from setup.py, fixes in doc

docs/options.md

@@ -343,8 +343,8 @@ CIBW_TEST_EXTRAS: test,qt
 ### `CIBW_BEFORE_TEST` {: #before-test}
 > Execute a shell command before testing each wheel
 
-A shell command to run in **each** test virtual environment, before your wheel is installed and tested. This is useful if you need to install non pip package, change values of environment variables
-or perform multi step pip installation (like install `scikit-build` or `cython` before install test package)
+A shell command to run in **each** test virtual environment, before your wheel is installed and tested. This is useful if you need to install a non pip package, change values of environment variables
+or perform multi step pip installation (e.g. installing `scikit-build` or `cython` before install test package)
 
 
 The active Python binary can be accessed using `python`, and pip with `pip`; `cibuildwheel` makes sure the right version of Python and pip will be executed. `{project}` can be used as a placeholder for the absolute path to the project's root and will be replaced by `cibuildwheel`.
@@ -356,14 +356,14 @@ Platform-specific variants also available:<br/>
 
 #### Examples
 ```yaml
-# install packages needed to build test dependencies
-CIBW_BEFORE_TEST: pip install cmake scikit-build
-
 # install test dependencies with overwritten environment variables. 
 CIBW_BEFORE_TEST: CC=gcc CXX=g++ pip install -r requirements.txt
 
 # chain commands using &&
-CIBW_BEFORE_TEST: yum install -y libffi-dev && pip install .
+CIBW_BEFORE_TEST : rm -rf ./data/cache && mkdir -p ./data/cache
+
+# install python packages that are required to install test dependencies
+CIBW_BEFORE_TEST: pip install cmake scikit-build
 ```
 
 ## Other

test/10_before_test/setup.py

@@ -1,16 +1,6 @@
 from setuptools import setup, Extension
 import sys, os
 
-# assert that the Python version as written to pythonversion.txt in the CIBW_BEFORE_BUILD step
-# is the same one as is currently running.
-version_file = 'c:\\pythonversion.txt' if sys.platform == 'win32' else '/tmp/pythonversion.txt'
-if os.path.exists(version_file):
-    os.remove(version_file)
-
-# check that the executable also was written
-executable_file = 'c:\\pythonexecutable.txt' if sys.platform == 'win32' else '/tmp/pythonexecutable.txt'
-if os.path.exists(executable_file):
-    os.remove(executable_file)
 
 setup(
     name="spam",

test/10_before_test/test/spam_test.py

@@ -4,8 +4,9 @@ from unittest import TestCase
 
 class TestBeforeTest(TestCase):
     def test_version(self):
-        # assert that the Python version as written to pythonversion.txt in the CIBW_BEFORE_BUILD step
+        # assert that the Python version as written to pythonversion.txt in the CIBW_BEFORE_TEST step
         # is the same one as is currently running.
+        # because of use symlinks in MacOS run this test is also need
         version_file = 'c:\\pythonversion.txt' if sys.platform == 'win32' else '/tmp/pythonversion.txt'
         with open(version_file) as f:
             stored_version = f.read()

unit_test/main_options_test.py

@@ -218,4 +218,4 @@ def test_before_test(before_test, platform_specific, platform, intercepted_build
 
     main()
 
-    assert intercepted_build_args.kwargs['before_test'] == before_test
+    assert intercepted_build_args.kwargs['before_test'] == before_test