Add BEFORE_ALL options

test/14_before_all/setup.py

@@ -0,0 +1,23 @@
+import os
+import sys
+
+from setuptools import (
+    Extension,
+    setup,
+)
+
+# assert that the Python version as written to text_info.txt in the CIBW_BEFORE_ALL step
+# is the same one as is currently running.
+with open("text_info.txt") as f:
+    stored_text = f.read()
+
+print("## stored text: "+stored_text)
+assert stored_text == "sample text"
+
+
+
+setup(
+    name="spam",
+    ext_modules=[Extension('spam', sources=['spam.c'])],
+    version="0.1.0",
+)