test: add unit tests for ActiveStreamingTool and ReadonlyContext

[nuthalapativarun]

Problem

Two classes in core/src/agents/ have no unit test coverage:

• ActiveStreamingTool (active_streaming_tool.ts)
• ReadonlyContext (readonly_context_test.ts)

Solution

Add unit tests for both classes:

active_streaming_tool_test.ts — 5 tests covering:

• Constructor with no params (both task and stream are undefined)
• Constructor with only task set
• Constructor with only stream set
• Constructor with both params
• Field reads after construction (including instanceof LiveRequestQueue check)

readonly_context_test.ts — 9 tests covering:

• Constructor instantiation with minimal InvocationContext mock
• Each getter (invocationId, userId, sessionId, agentName, userContent) delegates correctly
• userContent is undefined when not set
• state returns a State wrapping the session state values
• state returns a new State instance on each access

Testing

✓ core/test/agents/active_streaming_tool_test.ts (5 tests)
✓ core/test/agents/readonly_context_test.ts (9 tests)

All 2209 existing tests continue to pass. The 2 pre-existing failures (database_session_service_test.ts timeout) are unrelated to this change.

Checklist

• I have performed a self-review of my code
• Tests added and passing
• Manual E2E verified (N/A — test-only change)

[kalenkevich]

2026

[kalenkevich]

2026

[nuthalapativarun]

Hi team — following up on PR #464 (unit tests for ActiveStreamingTool and ReadonlyContext, 14 tests). Mergeable. Happy to address any feedback. Thanks!