Missing Conformance Tests

[Roaders]

I asked my AI agent to review the docs and the conformance tests to find any areas where we need to add some more and this was the result. I know that some of these are known but I am not sure if there is an issue for them. Feel free to close this issue it is not thought of as helpful.

Desktop Agent API MUST Requirements - Conformance Test Coverage Gap Analysis

Based on review of spec.md (lines 90-124) and the conformance tests in toolbox/fdc3-conformance/src/test/.

Requirements NOT Covered by Conformance Tests

#	Requirement	Spec Reference	Status	Comment
1	Browser-Resident Desktop Agent spec compliance	Line 96	❌ Not tested	Can be ignored I think
2	Preload Desktop Agent spec compliance	Line 97	❌ Not tested	Can be ignored I think
3	addEventListener function	Line 102	❌ Only manual test exists for userChannelChanged event	I presume there was a reason for manual testing only
4	Resolve fully-qualified and unqualified appId values (e.g. myApp@appd.example.com)	Line 118	❌ Not tested
5	optionalFeatures property in ImplementationMetadata	Line 122	❌ Not validated	I guess at minimum we could test that something is returned. Really we should look at what is returned then run additional tests based on what optional features are supported...
6	15-second timeout for context/intent listener on app launch	Line 123	❌ Not tested	There are definitely tests around this but not specifically for the 15 second delay. I think we can ignore.
7	Methods MUST be bound to their instances (for destructuring support)	Line 124	❌ Not tested

Requirements Partially Covered

#	Requirement	Spec Reference	Status
8	Intent resolution MUST take into account specified input or return context types	Line 116	⚠️ Partially covered by findIntent tests
9	Return Error Objects from ChannelError, OpenError, ResolveError, ResultError enumerations	Line 119	⚠️ Only some error types tested

Requirements Fully Covered

#	Requirement	Spec Reference	Test Coverage
10	Requests for resolution to apps returning a channel MUST include apps returning channel with specific type	Line 117	✅ FindIntentAppDByResultChannel1/2
11	PrivateChannels MUST have an ID and MUST NOT be retrievable via getOrCreateChannel	Line 120	✅ PrivateChannelsAreNotAppChannels
12	Include implementations of required DesktopAgent API functions	Lines 99-114	✅ Basic tests exist for all listed functions

Recommendations

• Add automated tests for addEventListener - Currently only a manual test exists
• Add fully-qualified appId resolution tests - Test matching appId@domain format against unqualified IDs
• Validate optionalFeatures in getInfo tests - Ensure the property exists and has expected structure
• Add timeout validation tests - Verify 15-second timeout behavior for listener registration on launch
• Add method binding tests - Verify destructured methods work correctly (e.g., const { broadcast } = channel;)
• Expand error type coverage - Ensure all enumeration values are tested across relevant APIs

[Roaders]

Some of the recommendations can be ignored - feel free to check off ones that we can forget about. Some are definitely valid. Once I've had some feedback on this list I can try and implement some of them.

[Roaders]

raised #1774 #1775 #1776 #1777 #1778 #1779