Bug 286763 – [WebDriver][BiDi] Add proper session.subscribe and session.unsubscribe parameter checks for events and context

• Status: NEW
• Component: WebDriver

[Lauro Moura]

imported/w3c/webdriver/tests/bidi/session/subscribe/invalid.py
imported/w3c/webdriver/tests/bidi/session/unsubscribe/invalid.py

For example, currently we just check if "events" is an array and, for each element get `eventName->asString()`, while the spec expects the name to be actually a string, and a valid module or event name.

Non-Comprehensive list of test cases from wpt:

- Empty parameters should raise InvalidArgument

- Invalid "events" parameter type (i.e. non-array) should raise InvalidArgument
- "events" as an empty array should raise InvalidArgument
- Invalid "events" values types (non-string) should raise InvalidArgument
- "events" values that refer to unknown events should raise InvalidArgument
- Mixing known and unknown events should, not subscribe to the known event
  - Raise InvalidArgument

- Invalid "contexts" parameter type (i.e. non-array) should raise InvalidArgument
- "contexts" as an empty array should raise InvalidArgument
- Invalid "context" values types (non-string) should raise InvalidArgument
- Invalid "context" value (e.g. non-existing frame) should raise NoSuchFrame
- Valid event and invalid context should not subscribe to the event, raising NoSuchFrame
- Trying to subscribe to a context of a closed tab should raise NoSuchFrame

[Radar WebKit Bug Importer]

<rdar://problem/144324820>