loki/docs/testing/notes/ITERATION-4-NOTES.md

Iteration 4 — Test Implementation Notes

Plan file addressed

docs/testing/plans/04-agents.md

Tests created

src/config/agent.rs (4 new tests)

Test name	What it verifies
agent_config_parses_from_yaml	Full AgentConfig YAML with all fields
agent_config_defaults	Minimal AgentConfig gets correct defaults
agent_config_with_model	model_id, temperature, top_p from YAML
agent_config_inject_defaults_true	inject_todo/spawn_instructions default true

src/config/agent_runtime.rs (2 new tests)

Test name	What it verifies
agent_runtime_new_defaults	All fields default correctly
agent_runtime_builder_pattern	with_depth, with_parent_supervisor work

src/config/request_context.rs (6 new tests, 17 total)

Test name	What it verifies
exit_agent_clears_all_agent_state	exit_agent clears agent, agent_runtime, rag
current_depth_returns_zero_without_agent	Default depth is 0
current_depth_returns_agent_runtime_depth	Depth from agent_runtime
supervisor_returns_none_without_agent	No agent → no supervisor
inbox_returns_none_without_agent	No agent → no inbox
root_escalation_queue_returns_none_without_agent	No agent → no queue

Total: 12 new tests (105 → 117)

Bugs discovered

None.

Observations for future iterations

1. Agent::init can't be unit tested easily — requires agent config files, tool files on disk. Integration tests with temp directories would be needed for full coverage.

2. AgentConfig default values verified:

   • max_concurrent_agents = 4
   • max_agent_depth = 3
   • max_auto_continues = 10
   • inject_todo_instructions = true
   • inject_spawn_instructions = true These are important behavioral contracts.

3. The exit_agent test shows that clearing agent state also rebuilds the tool_scope with fresh functions. This is the correct behavior for returning to the global context.

4. Agent variable interpolation (special vars like os, cwd) happens in Agent::init which is filesystem-dependent. Deferred.

5. list_agents() (which filters hidden dirs) is tested via the .shared exclusion noted in improvements. Could add a unit test with a temp dir if needed.

Next iteration

Plan file 05: MCP Lifecycle — the most critical test area. McpFactory, McpRuntime, spawn_mcp_server, rebuild_tool_scope MCP integration, scope transition MCP behavior.