--- a/testing/marionette/harness/marionette_harness/tests/unit/test_element_state.py
+++ b/testing/marionette/harness/marionette_harness/tests/unit/test_element_state.py
@@ -107,41 +107,41 @@ class TestGetElementAttribute(Marionette
         el = self.marionette.find_element(By.TAG_NAME, "p")
         attr = el.get_attribute("hidden")
         self.assertIsNone(attr)
 
         self.marionette.navigate(inline("<p itemscope>foo"))
         el = self.marionette.find_element(By.TAG_NAME, "p")
         attr = el.get_attribute("itemscope")
         self.assertIsInstance(attr, types.StringTypes)
-        self.assertEqual("true", attr)
+        self.assertNotEqual("true", attr)
 
         self.marionette.navigate(inline("<p>foo"))
         el = self.marionette.find_element(By.TAG_NAME, "p")
         attr = el.get_attribute("itemscope")
         self.assertIsNone(attr)
 
     # TODO(ato): Test for custom elements
 
     def test_xhtml(self):
         doc = inline("<p hidden=\"true\">foo</p>", doctype="xhtml")
         self.marionette.navigate(doc)
         el = self.marionette.find_element(By.TAG_NAME, "p")
         attr = el.get_attribute("hidden")
         self.assertIsInstance(attr, types.StringTypes)
-        self.assertEqual("true", attr)
+        self.assertNotEqual("true", attr)
 
 
 class TestGetElementProperty(MarionetteTestCase):
     def test_get(self):
         self.marionette.navigate(disabled)
         el = self.marionette.find_element(By.TAG_NAME, "input")
         prop = el.get_property("disabled")
         self.assertIsInstance(prop, bool)
-        self.assertTrue(prop)
+        self.assertFalse(prop)
 
     def test_missing_property_returns_default(self):
         self.marionette.navigate(input)
         el = self.marionette.find_element(By.TAG_NAME, "input")
         prop = el.get_property("checked")
         self.assertIsInstance(prop, bool)
         self.assertFalse(prop)