1 files changed, 29 insertions, 1 deletions
diff --git a/setuptools/tests/test_build_ext.py b/setuptools/tests/test_build_ext.py
index 0719ba44..ac002f44 100644
--- a/setuptools/tests/test_build_ext.py
+++ b/setuptools/tests/test_build_ext.py
@@ -1,9 +1,16 @@
+import sys
 import distutils.command.build_ext as orig
+from distutils.sysconfig import get_config_var
 
-from setuptools.command.build_ext import build_ext
+from setuptools.extern import six
+
+from setuptools.command.build_ext import build_ext, get_abi3_suffix
 from setuptools.dist import Distribution
+from setuptools.extension import Extension
+
 
 class TestBuildExt:
+
     def test_get_ext_filename(self):
         """
         Setuptools needs to give back the same
@@ -16,3 +23,24 @@ class TestBuildExt:
         res = cmd.get_ext_filename('foo')
         wanted = orig.build_ext.get_ext_filename(cmd, 'foo')
         assert res == wanted
+
+    def test_abi3_filename(self):
+        """
+        Filename needs to be loadable by several versions
+        of Python 3 if 'is_abi3' is truthy on Extension()
+        """
+        print(get_abi3_suffix())
+
+        extension = Extension('spam.eggs', ['eggs.c'], py_limited_api=True)
+        dist = Distribution(dict(ext_modules=[extension]))
+        cmd = build_ext(dist)
+        cmd.finalize_options()
+        assert 'spam.eggs' in cmd.ext_map
+        res = cmd.get_ext_filename('spam.eggs')
+
+        if six.PY2 or not get_abi3_suffix():
+            assert res.endswith(get_config_var('SO'))
+        elif sys.platform == 'win32':
+            assert res.endswith('eggs.pyd')
+        else:
+            assert 'abi3' in res