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EDIT :: test_throw.py

import sys from greenlet import greenlet from . import TestCase def switch(*args): return greenlet.getcurrent().parent.switch(*args) class ThrowTests(TestCase): def test_class(self): def f(): try: switch("ok") except RuntimeError: switch("ok") return switch("fail") g = greenlet(f) res = g.switch() self.assertEqual(res, "ok") res = g.throw(RuntimeError) self.assertEqual(res, "ok") def test_val(self): def f(): try: switch("ok") except RuntimeError: val = sys.exc_info()[1] if str(val) == "ciao": switch("ok") return switch("fail") g = greenlet(f) res = g.switch() self.assertEqual(res, "ok") res = g.throw(RuntimeError("ciao")) self.assertEqual(res, "ok") g = greenlet(f) res = g.switch() self.assertEqual(res, "ok") res = g.throw(RuntimeError, "ciao") self.assertEqual(res, "ok") def test_kill(self): def f(): switch("ok") switch("fail") g = greenlet(f) res = g.switch() self.assertEqual(res, "ok") res = g.throw() self.assertTrue(isinstance(res, greenlet.GreenletExit)) self.assertTrue(g.dead) res = g.throw() # immediately eaten by the already-dead greenlet self.assertTrue(isinstance(res, greenlet.GreenletExit)) def test_throw_goes_to_original_parent(self): main = greenlet.getcurrent() def f1(): try: main.switch("f1 ready to catch") except IndexError: return "caught" return "normal exit" def f2(): main.switch("from f2") g1 = greenlet(f1) g2 = greenlet(f2, parent=g1) with self.assertRaises(IndexError): g2.throw(IndexError) self.assertTrue(g2.dead) self.assertTrue(g1.dead) g1 = greenlet(f1) g2 = greenlet(f2, parent=g1) res = g1.switch() self.assertEqual(res, "f1 ready to catch") res = g2.throw(IndexError) self.assertEqual(res, "caught") self.assertTrue(g2.dead) self.assertTrue(g1.dead) g1 = greenlet(f1) g2 = greenlet(f2, parent=g1) res = g1.switch() self.assertEqual(res, "f1 ready to catch") res = g2.switch() self.assertEqual(res, "from f2") res = g2.throw(IndexError) self.assertEqual(res, "caught") self.assertTrue(g2.dead) self.assertTrue(g1.dead) def test_non_traceback_param(self): with self.assertRaises(TypeError) as exc: greenlet.getcurrent().throw( Exception, Exception(), self ) self.assertEqual(str(exc.exception), "throw() third argument must be a traceback object") def test_instance_of_wrong_type(self): with self.assertRaises(TypeError) as exc: greenlet.getcurrent().throw( Exception(), BaseException() ) self.assertEqual(str(exc.exception), "instance exception may not have a separate value") def test_not_throwable(self): with self.assertRaises(TypeError) as exc: greenlet.getcurrent().throw( "abc" ) self.assertEqual(str(exc.exception), "exceptions must be classes, or instances, not str")

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