Bug 1671622 - [wdspec] Fix browser context checks for "Switch To Pare…

…nt Frame" if current browsing context is already the top-level one. r=webdriver-reviewers,jgraham

Tests for proposed WebDriver changes:
w3c/webdriver#1544

Differential Revision: https://phabricator.services.mozilla.com/D93763

testing/web-platform/tests/webdriver/tests/switch_to_parent_frame/switch.py

@@ -21,7 +21,16 @@ def test_null_response_value(session):
     assert value is None
 
 
-def test_no_top_browsing_context(session, closed_window):
+def test_no_top_browsing_context(session, url):
+    session.window_handle = session.new_window()
+
+    session.url = url("/webdriver/tests/support/html/frames.html")
+
+    subframe = session.find.css("#sub-frame", all=False)
+    session.switch_frame(subframe)
+
+    session.window.close()
+
     response = switch_to_parent_frame(session)
     assert_error(response, "no such window")
 
@@ -49,7 +58,12 @@ def test_no_browsing_context(session, closed_frame):
     session.find.css("#delete", all=False)
 
 
-def test_stale_element_from_iframe(session):
+def test_no_browsing_context_when_already_top_level(session, closed_window):
+    response = switch_to_parent_frame(session)
+    assert_error(response, "no such window")
+
+
+def test_switch_from_iframe(session):
     session.url = inline(iframe("<p>foo"))
     frame_element = session.find.css("iframe", all=False)
     session.switch_frame(frame_element)
@@ -63,5 +77,10 @@ def test_stale_element_from_iframe(session):
 
 
 def test_switch_from_top_level(session):
+    session.url = inline("<p>foo")
+    element = session.find.css("p", all=False)
+
     result = switch_to_parent_frame(session)
     assert_success(result)
+
+    assert element.text == "foo"