webdriver: add strictFileInteractability capability tests

The new strictFileInteractabilityTests capability takes a boolean and
can unconditionally be set to both true and false.  It is permitted
to be undefined.

Depends on D10270

Depends on D10270

Differential Revision: https://phabricator.services.mozilla.com/D10271

bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1502864
gecko-commit: dc69c736701f2b7b405e50ed92e3384e44e233c7
gecko-integration-branch: central
gecko-reviewers: jgraham

webdriver/tests/new_session/response.py

@@ -21,6 +21,7 @@ def test_sessionid(new_session, add_browser_capabilities):
     ("proxy", dict),
     ("setWindowRect", bool),
     ("timeouts", dict),
+    ("strictFileInteractability", bool),
     ("unhandledPromptBehavior", basestring),
 ])
 def test_capability_type(session, capability, type):
@@ -35,6 +36,7 @@ def test_capability_type(session, capability, type):
     ("proxy", {}),
     ("setWindowRect", True),
     ("timeouts", {"implicit": 0, "pageLoad": 300000, "script": 30000}),
+    ("strictFileInteractability", False),
     ("unhandledPromptBehavior", "dismiss and notify"),
 ])
 def test_capability_default_value(session, capability, default_value):

webdriver/tests/new_session/support/create.py

@@ -27,6 +27,9 @@
         {"script": 50, "pageLoad": 25},
         {"script": 500},
     ]),
+    ("strictFileInteractability", [
+        True, False, None,
+    ]),
     ("unhandledPromptBehavior", [
         "dismiss",
         "accept",
@@ -95,6 +98,9 @@
         {"pageLoad": {"value": 10}},
         {"pageLoad": 10, "invalid": 10},
     ]),
+    ("strictFileInteractability", [
+        1, [], {}, "false",
+    ]),
     ("unhandledPromptBehavior", [
         1, [], {}, False,
         "DISMISS",