When installing setup_requires/tests_require packages, use

--multi-version so that '.' doesn't have to support .pth files.

--HG--
branch : setuptools
extra : convert_revision : svn%3A6015fed2-1504-0410-9fe1-9d1591cc4771/sandbox/trunk/setuptools%4042681

setuptools/command/easy_install.py

@@ -363,8 +363,8 @@ Please make the appropriate changes for your system and try again.
                 if f: f.close()
                 if os.path.exists(ok_file): os.unlink(ok_file)
                 if os.path.exists(pth_file): os.unlink(pth_file)
-
-        log.warn("TEST FAILED: %s does NOT support .pth files", instdir)
+        if not self.multi_version:
+            log.warn("TEST FAILED: %s does NOT support .pth files", instdir)
         return False
 
     def install_egg_scripts(self, dist):

setuptools/dist.py

@@ -267,7 +267,7 @@ class Distribution(_Distribution):
                 self.__class__({'script_args':['easy_install']}),
                 args="x", install_dir=os.curdir, exclude_scripts=True,
                 always_copy=False, build_directory=None, editable=False,
-                upgrade=False
+                upgrade=False, multi_version=True
             )
             cmd.ensure_finalized()
             cmd.zip_ok = None       # override any setup.cfg setting for these