1 files changed, 46 insertions, 0 deletions
diff --git a/testing/marionette/harness/marionette_harness/tests/unit/test_execute_isolate.py b/testing/marionette/harness/marionette_harness/tests/unit/test_execute_isolate.py
new file mode 100644
index 0000000000..d60e2c062e
--- /dev/null
+++ b/testing/marionette/harness/marionette_harness/tests/unit/test_execute_isolate.py
@@ -0,0 +1,46 @@
+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+from marionette_driver.errors import ScriptTimeoutException
+
+from marionette_harness import MarionetteTestCase
+
+
+class TestExecuteIsolationContent(MarionetteTestCase):
+    def setUp(self):
+        super(TestExecuteIsolationContent, self).setUp()
+        self.content = True
+
+    def test_execute_async_isolate(self):
+        # Results from one execute call that has timed out should not
+        # contaminate a future call.
+        multiplier = "*3" if self.content else "*1"
+        self.marionette.timeout.script = 0.5
+        self.assertRaises(
+            ScriptTimeoutException,
+            self.marionette.execute_async_script,
+            (
+                "setTimeout(function() {{ arguments[0](5{}); }}, 3000);".format(
+                    multiplier
+                )
+            ),
+        )
+
+        self.marionette.timeout.script = 6
+        result = self.marionette.execute_async_script(
+            """
+        let [resolve] = arguments;
+        setTimeout(function() {{ resolve(10{}); }}, 5000);
+        """.format(
+                multiplier
+            )
+        )
+        self.assertEqual(result, 30 if self.content else 10)
+
+
+class TestExecuteIsolationChrome(TestExecuteIsolationContent):
+    def setUp(self):
+        super(TestExecuteIsolationChrome, self).setUp()
+        self.marionette.set_context("chrome")
+        self.content = False