use abi3 extension if Extension().is_abi3

1 files changed, 19 insertions, 1 deletions

diff --git a/setuptools/tests/test_build_ext.py b/setuptools/tests/test_build_ext.py
index 5168ebf0..e0f2e73b 100644
--- a/setuptools/tests/test_build_ext.py
+++ b/setuptools/tests/test_build_ext.py
@@ -1,8 +1,10 @@
+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.dist import Distribution
-
+from setuptools.extension import Extension
 
 class TestBuildExt:
 
@@ -18,3 +20,19 @@ 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()
+        """
+        dist = Distribution(dict(ext_modules=[Extension('spam.eggs', [], is_abi3=True)]))
+        cmd = build_ext(dist)
+        res = cmd.get_ext_filename('spam.eggs')
+
+        if sys.version_info[0] == 2:
+            assert res.endswith(get_config_var('SO'))
+        elif sys.platform == 'win32':
+            assert res.endswith('eggs.pyd')
+        else:
+            assert 'abi3' in res
\ No newline at end of file