Fix test__semaphore.py under PyPy3 by raising the right (wrong, really)...

Fix test__semaphore.py under PyPy3 by raising the right (wrong, really) exception type that PyPy does.

src/gevent/thread.py

@@ -31,6 +31,7 @@ else:
                     'start_new']
 error = __thread__.error
 from gevent._compat import PY3
+from gevent._compat import PYPY
 from gevent._util import copy_globals
 from gevent.hub import getcurrent, GreenletExit
 from gevent.greenlet import Greenlet
@@ -58,6 +59,9 @@ class LockType(BoundedSemaphore):
     # and any other API changes we need to make to match behaviour
     _OVER_RELEASE_ERROR = __thread__.error
 
+    if PYPY and PY3:
+        _OVER_RELEASE_ERROR = RuntimeError
+
     if PY3:
         _TIMEOUT_MAX = __thread__.TIMEOUT_MAX # python 2: pylint:disable=no-member
 

src/greentest/test__semaphore.py

@@ -67,7 +67,7 @@ class TestLock(greentest.TestCase):
             self.fail("Should have thrown an exception")
         except Exception as e:
             g_exc = e
-        self.assertTrue(isinstance(g_exc, type(std_exc)), (g_exc, std_exc))
+        self.assertIsInstance(g_exc, type(std_exc))
 
 
 if __name__ == '__main__':