Merge remote-tracking branch 'origin/master' into feat/adr0016-type-build-check
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imccyu
332
packages/core/agent-loop/tests/coverage-edges.spec.ts
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332
packages/core/agent-loop/tests/coverage-edges.spec.ts
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import { describe, expect, it } from 'vitest'
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import { Context } from 'cordis'
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import LlmService, { CallId, LlmError, StreamChunk } from '@deepseek-ai/dsh-llm'
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import SessionStore, { TurnEndReason } from '@deepseek-ai/dsh-session'
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import SystemPrompt from '@deepseek-ai/dsh-system-prompt'
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import ToolRegistry, { defineTool } from '@deepseek-ai/dsh-tools'
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import AgentRegistry, { AgentId } from '@deepseek-ai/dsh-agent'
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import AgentLoop, { ReactLoopAgent } from '@deepseek-ai/dsh-agent-loop'
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import { MockAdapter, textResponse, toolCallResponse } from './mock-adapter'
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async function harness(adapter: MockAdapter) {
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const ctx = new Context()
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await ctx.plugin(LlmService)
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await ctx.plugin(SessionStore)
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await ctx.plugin(SystemPrompt)
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await ctx.plugin(ToolRegistry)
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await ctx.plugin(AgentRegistry)
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await ctx.plugin(AgentLoop, { agents: [] })
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ctx.llm.registerAdapter(['mock'], adapter)
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return ctx
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}
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function waitForIdle(ctx: Context, agent: ReactLoopAgent): Promise<void> {
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return new Promise((resolve) => {
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const dispose = ctx.on('agent/status', (subject, status) => {
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if (subject === agent && status === 'idle') {
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dispose()
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resolve()
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}
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})
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})
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}
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function send(agent: ReactLoopAgent, text: string) {
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agent.send([{ type: 'text', text }])
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}
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describe('turn boundary listener throws (handled in-turn, loop survives)', () => {
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it('a throwing agent/turn-start listener surfaces via agent/error and the loop survives', async () => {
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// The agent/turn-start emit happens AFTER turn/start is appended to the log,
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// so a throwing listener is handled inside runTurn (the turn is balanced and
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// closed via failTurn → agent/error), NOT rethrown to the runLoop backstop.
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// The second turn should proceed normally and consume the first script entry.
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const adapter = new MockAdapter([textResponse('turn 2')])
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const ctx = await harness(adapter)
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const agent = ctx.agentLoop.create(AgentId('a1'), { model: 'mock' })
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let threwOnce = false
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ctx.on('agent/turn-start', () => {
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if (!threwOnce) {
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threwOnce = true
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throw new Error('broken turn-start listener')
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}
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})
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const errors: Error[] = []
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ctx.on('agent/error', (_agent, _turn, _step, error) => void errors.push(error))
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send(agent, 'first')
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await waitForIdle(ctx, agent)
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expect(errors.map(e => e.message)).toEqual(['broken turn-start listener'])
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// The turn is balanced: its turn/start was logged, so a turn/end was owed
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// and appended (decided from the log, not a flag).
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expect(agent.session.events.at(-1)?.type).toBe('turn/end')
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// loop survives: second turn works fine and makes the model call
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send(agent, 'second')
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await waitForIdle(ctx, agent)
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expect(adapter.requests).toHaveLength(1)
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expect(adapter.requests[0]!.messages.some(m => m.content.some(b => 'text' in b && b.text === 'second'))).toBe(true)
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})
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it('a throwing agent/turn-end listener surfaces via agent/error and the loop survives', async () => {
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const adapter = new MockAdapter([textResponse('turn 1'), textResponse('turn 2')])
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const ctx = await harness(adapter)
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const agent = ctx.agentLoop.create(AgentId('a1'), { model: 'mock' })
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let threwOnce = false
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ctx.on('agent/turn-end', () => {
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if (!threwOnce) {
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threwOnce = true
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throw new Error('broken turn-end listener')
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}
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})
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const errors: Error[] = []
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ctx.on('agent/error', (_agent, _turn, _step, error) => void errors.push(error))
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send(agent, 'first')
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await waitForIdle(ctx, agent)
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// The turn-end throw happens after the model call is complete, so turn 1's
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// request is consumed. turn/end is already in the log (append pushes before
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// notifying), so the turn is balanced; the error is surfaced via agent/error.
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expect(errors.map(e => e.message)).toEqual(['broken turn-end listener'])
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// loop survives: second turn works fine
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send(agent, 'second')
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await waitForIdle(ctx, agent)
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expect(adapter.requests).toHaveLength(2)
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})
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it('a pre-push turn/start failure (non-serializable source) is rethrown to the runLoop backstop', async () => {
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// A non-serializable message source makes the turn/start append throw BEFORE
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// the event is pushed (Session.append validates before push), so turn/start
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// never enters the log. runTurn sees no logged turn/start and rethrows; the
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// runLoop backstop reports via agent/error (step 0) + the logger and the
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// driver survives. This is the ONLY path that reaches the backstop.
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const adapter = new MockAdapter([textResponse('turn 2')])
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const ctx = await harness(adapter)
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const agent = ctx.agentLoop.create(AgentId('a1'), { model: 'mock' })
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const errors: { turn: number; step: number; message: string }[] = []
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ctx.on('agent/error', (_a, turn, step, error) => void errors.push({ turn, step, message: error.message }))
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// A non-serializable source (BigInt) on the queued message.
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agent.send([{ type: 'text', text: 'first' }], { source: { kind: 'plugin', plugin: 'p', bad: 1n } as never })
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await waitForIdle(ctx, agent)
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expect(errors).toHaveLength(1)
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expect(errors[0]!.step).toBe(0)
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expect(errors[0]!.message).toMatch(/non-JSON-serializable/)
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// No turn boundary was written (the turn/start append threw before push).
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expect(agent.session.events.some(e => e.type === 'turn/start')).toBe(false)
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// loop survives: a well-formed second turn runs normally.
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send(agent, 'second')
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await waitForIdle(ctx, agent)
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expect(adapter.requests).toHaveLength(1)
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})
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})
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describe('tool JSON parse', () => {
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it('passes through non-JSON arguments string without crashing', async () => {
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const adapter = new MockAdapter([
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// model emits tool-call with malformed arguments (not valid JSON)
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[
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{ type: 'block-start' as const, index: 0, blockType: 'tool-call' as const },
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{ type: 'block-end' as const, index: 0, block: { type: 'tool-call' as const, id: CallId('c1'), name: 'echo', arguments: 'not json' } },
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{ type: 'finish' as const, reason: { kind: 'tool-calls' as const } },
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] satisfies StreamChunk[],
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textResponse('done'),
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])
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const ctx = await harness(adapter)
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ctx.tools.register(defineTool({
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name: 'echo',
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description: 'echo tool',
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parameters: { input: { type: 'string' } },
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async execute(args: unknown) {
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return [{ type: 'text', text: typeof args === 'string' ? `raw: ${args}` : JSON.stringify(args) }]
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},
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}))
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const agent = ctx.agentLoop.create(AgentId('a1'), { model: 'mock' })
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send(agent, 'use tool')
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await waitForIdle(ctx, agent)
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// tool/call event should have recorded the raw arguments string
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const callEvent = agent.session.events.find(e => e.type === 'tool/call')
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expect(callEvent).toBeDefined()
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if (callEvent!.type === 'tool/call') {
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expect(callEvent!.data.arguments).toBe('not json')
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}
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// the loop did not crash — a result was produced
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expect(agent.session.events.some(e => e.type === 'tool/result')).toBe(true)
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})
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it('uses empty object when tool-call arguments are empty string', async () => {
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const adapter = new MockAdapter([
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[
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{ type: 'block-start' as const, index: 0, blockType: 'tool-call' as const },
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{ type: 'block-end' as const, index: 0, block: { type: 'tool-call' as const, id: CallId('c1'), name: 'noarg', arguments: '' } },
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{ type: 'finish' as const, reason: { kind: 'tool-calls' as const } },
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] satisfies StreamChunk[],
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textResponse('done'),
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])
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const ctx = await harness(adapter)
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ctx.tools.register(defineTool({
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name: 'noarg',
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description: 'no-arg tool',
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parameters: {},
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async execute() {
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return [{ type: 'text', text: 'ran with empty args' }]
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},
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}))
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const agent = ctx.agentLoop.create(AgentId('a1'), { model: 'mock' })
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send(agent, 'use tool')
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await waitForIdle(ctx, agent)
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expect(agent.session.events.some(e => e.type === 'tool/result')).toBe(true)
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})
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})
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describe('toError normalization', () => {
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it('normalizes non-Error throws from turn-start listeners via toError', async () => {
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const adapter = new MockAdapter([textResponse('ok')])
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const ctx = await harness(adapter)
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const agent = ctx.agentLoop.create(AgentId('a1'), { model: 'mock' })
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let threwOnce = false
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ctx.on('agent/turn-start', () => {
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if (!threwOnce) {
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threwOnce = true
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throw 'naked string error' // non-Error throw, normalized via toError
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}
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})
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const errors: Error[] = []
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ctx.on('agent/error', (_agent, _turn, _step, error) => void errors.push(error))
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send(agent, 'go')
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await waitForIdle(ctx, agent)
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expect(errors).toHaveLength(1)
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expect(errors[0]!.message).toBe('naked string error')
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// A non-Error throw is wrapped in a HarnessError with code UNKNOWN, so the
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// turn-end error reason carries a routable code instead of degrading.
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const turnEnd = agent.session.events.find(e => e.type === 'turn/end')
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expect(turnEnd?.type === 'turn/end' && turnEnd.data.reason.kind === 'error' && turnEnd.data.reason.code).toBe('UNKNOWN')
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})
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it('normalizes non-Error throws from agent/request waterfall via inline toError in runStep catch', async () => {
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const adapter = new MockAdapter([textResponse('irrelevant')])
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const ctx = await harness(adapter)
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const agent = ctx.agentLoop.create(AgentId('a1'), { model: 'mock' })
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let threwOnce = false
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ctx.on('agent/request', async (_agent, _turn, _step, _options, _next) => {
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if (!threwOnce) {
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threwOnce = true
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throw { code: 500 } // non-Error throw, goes through runStep catch
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}
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return _next()
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})
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const errors: Error[] = []
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ctx.on('agent/error', (_agent, _turn, _step, error) => void errors.push(error))
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send(agent, 'go')
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await waitForIdle(ctx, agent)
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expect(errors).toHaveLength(1)
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// String() of { code: 500 } is '[object Object]'
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expect(errors[0]!.message).toBe('[object Object]')
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const turnEnd = agent.session.events.find(e => e.type === 'turn/end')
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expect(turnEnd?.type === 'turn/end' && turnEnd.data.reason.kind === 'error' && turnEnd.data.reason.code).toBe('UNKNOWN')
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})
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})
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describe('coded error data emission', () => {
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it('errorData includes code when a coded error (LlmError) is thrown from a plugin', async () => {
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const adapter = new MockAdapter([textResponse('turn 1')])
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const ctx = await harness(adapter)
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const agent = ctx.agentLoop.create(AgentId('a1'), { model: 'mock' })
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let threwOnce = false
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ctx.on('agent/request', async (_agent, _turn, _step, _options, next) => {
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if (!threwOnce) {
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threwOnce = true
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throw new LlmError('server overloaded', 'RATE_LIMIT')
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}
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return next()
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})
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const errors: Error[] = []
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ctx.on('agent/error', (_agent, _turn, _step, error) => void errors.push(error))
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send(agent, 'go')
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await waitForIdle(ctx, agent)
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expect(errors).toHaveLength(1)
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expect(errors[0]!.message).toBe('server overloaded')
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// turn-end error reason includes the code
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const turnEnd = agent.session.events.find(e => e.type === 'turn/end')
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expect(turnEnd).toBeDefined()
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if (turnEnd?.type === 'turn/end' && turnEnd.data.reason.kind === 'error') {
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expect(turnEnd.data.reason.code).toBe('RATE_LIMIT')
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}
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})
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})
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describe('disposed vs aborted branching', () => {
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it('handles dispose during model streaming producing reason "disposed"', async () => {
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const adapter = new MockAdapter(['hang'])
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const ctx = await harness(adapter)
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let agent!: ReactLoopAgent
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const fiber = await ctx.plugin(Object.assign((inner: Context) => {
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agent = inner.agentLoop.create(AgentId('scoped'), { model: 'mock' })
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}, { inject: ['agentLoop'] }))
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const reasons: TurnEndReason[] = []
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ctx.on('agent/turn-end', (_agent, _turn, reason) => void reasons.push(reason))
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send(agent, 'go')
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await new Promise(r => setTimeout(r, 30))
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await fiber.dispose() // dispose during hang
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await agent.done
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// The review-fixes test for 'HIGH: disposed status' already covers
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// this assertion path. The reason is 'disposed' because isDisposed() is
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// checked before the abort signal check in the error path.
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expect(reasons).toContainEqual({ kind: 'disposed' })
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})
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})
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describe('structured tool error propagation (the runtime-validation RFC, part 2)', () => {
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it('forwards a tool HarnessError onto the tool/result session event', async () => {
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const { HarnessError } = await import('@deepseek-ai/dsh-llm')
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// First model turn calls the tool; second turn (after the tool result is
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// fed back) ends with plain text so the loop settles.
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const adapter = new MockAdapter([
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toolCallResponse('c1', 'boom', {}),
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textResponse('done'),
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])
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const ctx = await harness(adapter)
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const agent = ctx.agentLoop.create(AgentId('a1'), { model: 'mock' })
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ctx.tools.register(defineTool({
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name: 'boom',
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description: 'always fails',
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parameters: {},
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async execute() {
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throw new HarnessError('exploded', 'BOOM')
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},
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}))
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send(agent, 'go')
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await waitForIdle(ctx, agent)
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const toolResult = agent.session.events.find(e => e.type === 'tool/result')
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expect(toolResult?.type === 'tool/result' && toolResult.data.isError).toBe(true)
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expect(toolResult?.type === 'tool/result' && toolResult.data.error)
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.toEqual({ name: 'HarnessError', code: 'BOOM' })
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})
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})
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