1 files changed, 34 insertions, 0 deletions
diff --git a/testing/marionette/harness/marionette_harness/tests/unit/test_browsermobproxy.py b/testing/marionette/harness/marionette_harness/tests/unit/test_browsermobproxy.py
new file mode 100644
index 000000000..64b3d1a77
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+++ b/testing/marionette/harness/marionette_harness/tests/unit/test_browsermobproxy.py
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+import datetime
+
+from marionette_harness.runner import BrowserMobTestCase
+
+
+class TestBrowserMobProxy(BrowserMobTestCase):
+    """To run this test, you'll need to download the browsermob-proxy from
+       http://bmp.lightbody.net/, and then pass the path to the startup
+       script (typically /path/to/browsermob-proxy-2.0.0/bin/browsermob-proxy)
+       as the --browsermob-script argument when running runtests.py.
+
+       You can additionally pass --browsermob-port to specify the port that
+       the proxy will run on; it defaults to 8080.
+
+       This test is NOT run in CI, as bmp and dependencies aren't available
+       there.
+    """
+
+    def test_browsermob_proxy_limits(self):
+        """This illustrates the use of download limits in the proxy,
+           and verifies that it's slower to load a page @100kbps
+           than it is to download the same page @1000kbps.
+        """
+        proxy = self.create_browsermob_proxy()
+        proxy.limits({'downstream_kbps': 1000})
+        time1 = datetime.datetime.now()
+        self.marionette.navigate('http://forecast.weather.gov')
+        time2 = datetime.datetime.now()
+        proxy.limits({'downstream_kbps': 100})
+        time3 = datetime.datetime.now()
+        self.marionette.refresh()
+        time4 = datetime.datetime.now()
+        self.assertTrue(time4 - time3 > time2 - time1,
+                        "page load @ 100kbps not slower than page load @ 1000kbps")