Bug 1285240: Update tests to prevent redefinitions r=ato

The tests had the same name which caused a redefinition meaning only one of the tests
was run.

MozReview-Commit-ID: LuflhcD4wKl

--HG--
extra : rebase_source : 09b233c42cd0dba4437f51dc63986c119711cd70

testing/marionette/harness/marionette/tests/unit/test_element_retrieval.py

@@ -147,7 +147,7 @@ class TestFindElementHTML(MarionetteTestCase):
         self.assertRaises(NoSuchElementException, self.marionette.find_element, By.TAG_NAME, "cheese")
         self.assertRaises(NoSuchElementException, self.marionette.find_element, By.XPATH, "cheese")
 
-    def test_not_found(self):
+    def test_not_found_from_element(self):
         self.marionette.set_search_timeout(0)
         self.marionette.navigate(id_html)
         el = self.marionette.find_element(By.ID, "foo")
@@ -160,7 +160,7 @@ class TestFindElementHTML(MarionetteTestCase):
         self.assertRaises(NoSuchElementException, el.find_element, By.TAG_NAME, "cheese")
         self.assertRaises(NoSuchElementException, el.find_element, By.XPATH, "cheese")
 
-    def test_not_found_implicit_wait(self):
+    def test_not_found_implicit_wait_from_element(self):
         self.marionette.set_search_timeout(50)
         self.marionette.navigate(id_html)
         el = self.marionette.find_element(By.ID, "foo")