Update 2025-04-24_11:44:19

venv/lib/python3.11/site-packages/greenlet/tests/test_throw.py

@@ -0,0 +1,128 @@
+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")