Fix the subprocess tests on PyPy: they fail even in a stock build, so skip the...

Fix the subprocess tests on PyPy: they fail even in a stock build, so skip the one that's a problem.

gevent/subprocess.py

@@ -142,14 +142,16 @@ def check_output(*popenargs, **kwargs):
 
     The arguments are the same as for the Popen constructor.  Example:
 
-    >>> check_output(["ls", "-1", "/dev/null"])
-    b'/dev/null\n'
+    >>> print(check_output(["ls", "-1", "/dev/null"]))
+    /dev/null
+    <BLANKLINE>
 
     The stdout argument is not allowed as it is used internally.
     To capture standard error in the result, use stderr=STDOUT.
 
-    >>> check_output(["/bin/sh", "-c", "echo hello world"], stderr=STDOUT)
-    b'hello world\n'
+    >>> print(check_output(["/bin/sh", "-c", "echo hello world"], stderr=STDOUT))
+    hello world
+    <BLANKLINE>
     """
     if 'stdout' in kwargs:
         raise ValueError('stdout argument not allowed, it will be overridden.')

greentest/2.7pypy/test_subprocess.py

@@ -20,6 +20,7 @@ except ImportError:
     threading = None
 
 mswindows = (sys.platform == "win32")
+PYPY = hasattr(sys, 'pypy_version_info')
 
 #
 # Depends on the following external programs: Python
@@ -193,8 +194,8 @@ class ProcessTestCase(BaseTestCase):
         p.wait()
         self.assertEqual(p.returncode, 47)
 
-    @unittest.skipIf(sysconfig.is_python_build(),
-                     "need an installed Python. See #7774")
+    @unittest.skipIf(sysconfig.is_python_build() or PYPY,
+                     "need an installed Python. See #7774. Also fails to get sys.prefix on PyPy")
     def test_executable_without_cwd(self):
         # For a normal installation, it should work without 'cwd'
         # argument.  For test runs in the build directory, see #7774.

known_failures.py

@@ -76,9 +76,6 @@ if PYPY:
         # check_sendall_interrupted and testInterruptedTimeout fail due to
         # https://bitbucket.org/cffi/cffi/issue/152/handling-errors-from-signal-handlers-in
         'test_socket.py',
-
-        # No idea!
-        'test_subprocess.py',  # test_executable_without_cwd
     ]