Add an integration test for the setuptools based build from #2104.

runtests.py

@@ -116,6 +116,7 @@ def get_distutils_distro(_cache=[]):
 EXT_DEP_MODULES = {
     'tag:numpy':    'numpy',
     'tag:pythran':  'pythran',
+    'tag:setuptools':  'setuptools.sandbox',
     'tag:asyncio':  'asyncio',
     'tag:pstats':   'pstats',
     'tag:posix':    'posix',

tests/build/setuptools_reimport.srctree

+# mode: run
+# tag: setuptools
+
+PYTHON setup.py
+
+
+######## module.pyx ########
+
+cimport cython
+
+
+######## import_cython.py ########
+
+import Cython.Compiler.Main
+
+
+######## setup.py ########
+
+from setuptools.sandbox import run_setup
+run_setup('import_cython.py', ['egg_info'])
+
+from Cython.Build import cythonize
+cythonize('module.pyx')