test__hub.py: add test for signal()

greentest/test__hub.py

@@ -25,6 +25,7 @@ import time
 import gevent
 from gevent import core
 from gevent import socket
+import signal
 
 DELAY = 0.1
 
@@ -121,6 +122,26 @@ class TestSleep(greentest.GenericWaitTestCase):
         gevent.sleep(timeout)
 
 
+class Expected(Exception):
+    pass
+
+
+class TestSignal(greentest.TestCase):
+
+    __timeout__ = 2
+
+    def test_exception_goes_to_MAIN(self):
+        def handler():
+            raise Expected('TestSignal')
+        gevent.signal(signal.SIGALRM, handler)
+        signal.alarm(1)
+        try:
+            gevent.sleep(1.1)
+            raise AssertionError('must raise Expected')
+        except Expected, ex:
+            assert str(ex) == 'TestSignal', ex
+
+
 if __name__=='__main__':
     greentest.main()