Add BEFORE_ALL options

test/14_before_all/cibuildwheel_test.py

@@ -0,0 +1,23 @@
+import os
+
+import utils
+
+
+def test():
+    project_dir = os.path.dirname(__file__)
+
+    with open(os.path.join(project_dir, "text_info.txt"), mode='w') as ff:
+        print("dummy text", file=ff)
+
+    # build the wheels
+    actual_wheels = utils.cibuildwheel_run(project_dir, add_env={
+        # write python version information to a temporary file, this is
+        # checked in setup.py
+        'CIBW_BEFORE_ALL': '''python -c "open('{project}/text_info.txt', 'w').write('sample text')"''',
+    })
+
+
+    # also check that we got the right wheels
+    os.remove(os.path.join(project_dir, "text_info.txt"))
+    expected_wheels = utils.expected_wheels('spam', '0.1.0')
+    assert set(actual_wheels) == set(expected_wheels)