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const request = LLM.request({ model: LanguageModel.make({ id: "fictional-model", provider: "fixture", route: OpenAIChat.route }), prompt: "Say hello",})const legacy = testEffect(TestLLM.layer())const it = testEffect(TestLLM.testLayer())
describe("TestLLM legacy client", () => { legacy.effect("does not observe requests or consume responses until execution", () => Effect.gen(function* () { const llm = yield* TestLLM.Service yield* llm.push(TestLLM.text("first", "first"), TestLLM.text("second", "second"))
llm.client.stream(request) llm.client.generate(request) expect(llm.requests).toEqual([])
expect((yield* llm.client.generate(request)).text).toBe("first") expect((yield* llm.client.generate(request)).text).toBe("second") expect(llm.requests).toEqual([request, request]) }), )
legacy.effect("assigns and records a fresh response for each execution", () => Effect.gen(function* () { const llm = yield* TestLLM.Service yield* llm.push( TestLLM.text("first", "first"), TestLLM.text("second", "second"), TestLLM.text("third", "third"), TestLLM.text("fourth", "fourth"), ) const stream = llm.client.stream(request) const generate = llm.client.generate(request)
expect(yield* Stream.runCollect(stream)).toEqual(TestLLM.text("first", "first")) expect(yield* Stream.runCollect(stream)).toEqual(TestLLM.text("second", "second")) expect((yield* generate).text).toBe("third") expect((yield* generate).text).toBe("fourth") expect(llm.requests).toEqual([request, request, request, request]) }), )
legacy.effect("keeps module-level controls and clientLayer on the same backing state", () => Effect.gen(function* () { const llm = yield* TestLLM.Service const requests = llm.requests yield* TestLLM.push(TestLLM.text("queued", "queued")) yield* TestLLM.always(TestLLM.text("fallback", "fallback")) expect((yield* LLMClient.generate(request).pipe(Effect.provide(TestLLM.clientLayer))).text).toBe("queued") yield* TestLLM.wait(1) expect(requests).toEqual([request]) requests.length = 0 expect((yield* llm.client.generate(request)).text).toBe("fallback") expect(llm.requests).toBe(requests) expect(requests).toEqual([request]) }), )})
describe("TestLLM first-class client", () => { it.effect("returns scripted checkpoints only for trigger compaction", () => Effect.gen(function* () { const client = yield* TestLLM.Test const request = LLM.request({ model: OpenAI.configure().responses("fixture"), prompt: "hello" }) const checkpoint = new CompactionCheckpointResponse({ checkpoint: { type: "compaction", provider: ProviderID.make("openai"), encrypted: "opaque" }, responseID: "resp_fixture", }) const endpoint = new CompactionResponse({ replacement: [] }) yield* client.push(checkpoint, endpoint, checkpoint, checkpoint) const operation = LLMClient.compact(request, { mechanism: "trigger" }) expect(yield* client.requests()).toEqual([]) expect(yield* operation).toBe(checkpoint) expect(yield* client.compact(request, { mechanism: "trigger" }).pipe(Effect.catchDefect(Effect.succeed))).toBe( "TestLLM trigger compaction requires a CompactionCheckpointResponse", ) expect(yield* client.compact(request).pipe(Effect.catchDefect(Effect.succeed))).toBe( "TestLLM compaction requires a CompactionResponse", ) expect(yield* client.generate(request).pipe(Effect.catchDefect(Effect.succeed))).toBe( "TestLLM generation requires an event response", ) }), )
it.effect("rejects response fixtures for the wrong operation", () => Effect.gen(function* () { const client = yield* TestLLM.Test const request = LLM.request({ model: OpenAI.configure({ apiKey: "test" }).responses("fixture"), prompt: "hello" }) yield* client.push(TestLLM.stop(), new CompactionResponse({ replacement: [] })) expect(yield* client.compact(request).pipe(Effect.catchDefect(Effect.succeed))).toBe( "TestLLM compaction requires a CompactionResponse", ) expect(yield* client.generate(request).pipe(Effect.catchDefect(Effect.succeed))).toBe( "TestLLM generation requires an event response", ) }), )
it.effect("scripts replacement windows with the same lazy recording, gates, and fallback controls", () => Effect.gen(function* () { const client = yield* TestLLM.Test const request = LLM.request({ model: OpenAI.configure({ apiKey: "test" }).responses("fixture"), prompt: "hello" }) const compacted = new CompactionResponse({ replacement: [ Message.user("retained input"), Message.assistant(CompactionPart.make({ provider: ProviderID.make("openai"), encrypted: "checkpoint" })), Message.user("retained tail"), ], }) yield* client.push(compacted, TestLLM.text("continued", "answer")) const operation = LLMClient.compact(request) expect(yield* client.requests()).toEqual([]) const gate = yield* client.gate() const fiber = yield* operation.pipe(Effect.forkChild({ startImmediately: true })) yield* gate.started yield* client.wait(1) expect(fiber.pollUnsafe()).toBeUndefined() yield* gate.release expect(yield* Fiber.join(fiber)).toBe(compacted) const next = LLMRequest.update(request, { messages: compacted.replacement }) expect((yield* LLMClient.generate(next)).text).toBe("continued") yield* client.serve((observed) => { expect(observed).toBe(next) return compacted }) expect(yield* LLMClient.compact(next)).toBe(compacted) yield* client.always(compacted) expect(yield* LLMClient.compact(next)).toBe(compacted) expect(yield* client.requests()).toEqual([request, next, next, next]) }), )
it.effect("provides the same object under normal and test tags with snapshot observations", () => Effect.gen(function* () { const llm = yield* TestLLM.Test const client = yield* LLMClient.Service expect(client).toBe(llm) const before = yield* llm.requests() yield* llm.push(TestLLM.text("hello", "answer")) const generate = client.generate(request) client.stream(request) expect(yield* llm.requests()).toEqual([])
expect((yield* generate).text).toBe("hello") expect(before).toEqual([]) expect(yield* llm.requests()).toEqual([request]) expect(yield* llm.requests()).not.toBe(yield* llm.requests()) }), )
it.effect("prioritizes queued replies over request-dependent and constant fallbacks", () => Effect.gen(function* () { const llm = yield* TestLLM.Test const served: LLMRequest[] = [] yield* llm.always(TestLLM.text("old fallback", "old")) yield* llm.push(TestLLM.text("first", "first"), TestLLM.text("second", "second")) yield* llm.serve((request) => { served.push(request) return TestLLM.text(request.promptCacheKey ?? "default", "served") })
expect((yield* LLMClient.generate(request)).text).toBe("first") expect((yield* LLMClient.generate(request)).text).toBe("second") expect(served).toEqual([]) const selected = LLMRequest.update(request, { promptCacheKey: "selected" }) expect((yield* LLMClient.generate(selected)).text).toBe("selected") expect((yield* LLMClient.generate(request)).text).toBe("default") expect(served).toEqual([selected, request])
yield* llm.push(TestLLM.text("queued again", "queued")) yield* llm.always(TestLLM.text("constant", "constant")) expect((yield* LLMClient.generate(request)).text).toBe("queued again") expect((yield* LLMClient.generate(request)).text).toBe("constant") expect((yield* LLMClient.generate(request)).text).toBe("constant") expect(served).toEqual([selected, request]) }), )
testEffect( TestLLM.testLayer({ transformRequest: (request) => LLMRequest.update(request, { promptCacheKey: "observation" }), }), ).effect("transforms observations without changing the request passed to the responder", () => Effect.gen(function* () { const llm = yield* TestLLM.Test yield* llm.serve((input) => { expect(input).toBe(request) return TestLLM.text("original", "answer") }) const generate = llm.generate(request) expect(yield* llm.requests()).toEqual([]) expect((yield* generate).text).toBe("original") expect(yield* llm.requests()).toEqual([LLMRequest.update(request, { promptCacheKey: "observation" })]) }), )
it.effect("broadcasts request-arrival waits and satisfies waits registered afterward", () => Effect.gen(function* () { const llm = yield* TestLLM.Test yield* llm.always(TestLLM.stop()) const first = yield* llm.wait(2).pipe(Effect.forkChild({ startImmediately: true })) const second = yield* llm.wait(2).pipe(Effect.forkChild({ startImmediately: true })) yield* llm.generate(request) expect(first.pollUnsafe()).toBeUndefined() expect(second.pollUnsafe()).toBeUndefined() yield* llm.generate(request) yield* Fiber.join(first) yield* Fiber.join(second) yield* llm.wait(2) expect(yield* llm.requests()).toHaveLength(2) }), ) ;(["queued", "served"] as const).forEach((mode) => { it.effect(`assigns ${mode} replies before resuming request-arrival continuations`, () => Effect.gen(function* () { const llm = yield* TestLLM.Test const responses = [TestLLM.text("first", "first"), TestLLM.text("second", "second")] yield* mode === "queued" ? llm.push(...responses) : llm.serve(() => responses.shift() ?? []) const later = yield* llm .wait(1) .pipe(Effect.andThen(llm.generate(request)), Effect.forkChild({ startImmediately: true }))
expect((yield* llm.generate(request)).text).toBe("first") expect((yield* Fiber.join(later)).text).toBe("second") expect(yield* llm.requests()).toEqual([request, request]) }), ) })
it.effect("notifies arrival waiters even when the responder defects", () => Effect.gen(function* () { const llm = yield* TestLLM.Test const defect = new Error("Broken fixture responder") yield* llm.serve(() => { throw defect }) const waiter = yield* llm.wait(1).pipe(Effect.forkChild({ startImmediately: true })) expect(yield* llm.generate(request).pipe(Effect.catchDefect(Effect.succeed))).toBe(defect) yield* Fiber.join(waiter) }), )
it.effect("builds independent state even when the same layer is provided concurrently", () => { const layer = TestLLM.testLayer() const run = Effect.gen(function* () { const llm = yield* TestLLM.Test expect(yield* llm.requests()).toEqual([]) yield* llm.push(TestLLM.text("one", "answer")) expect((yield* LLMClient.generate(request)).text).toBe("one") return yield* llm.requests() }).pipe(Effect.provide(layer)) return Effect.gen(function* () { expect(yield* Effect.all([run, run], { concurrency: "unbounded" })).toEqual([[request], [request]]) }) })
it.effect("counts concurrent starts on one gate without serializing their response assignment", () => Effect.gen(function* () { const llm = yield* TestLLM.Test yield* llm.push(TestLLM.text("first", "first"), TestLLM.text("second", "second")) const generate = llm.generate(request) const gate = yield* llm.gate() const first = yield* generate.pipe(Effect.forkChild({ startImmediately: true })) yield* gate.started const second = yield* generate.pipe(Effect.forkChild({ startImmediately: true })) yield* gate.started yield* llm.wait(2) expect(first.pollUnsafe()).toBeUndefined() expect(second.pollUnsafe()).toBeUndefined() yield* gate.release expect((yield* Fiber.join(first)).text).toBe("first") expect((yield* Fiber.join(second)).text).toBe("second") }), )
it.effect("does not clear a replacement gate when the previous gate is released", () => Effect.gen(function* () { const llm = yield* TestLLM.Test yield* llm.always(TestLLM.stop()) const previous = yield* llm.gate() const first = yield* llm.generate(request).pipe(Effect.forkChild({ startImmediately: true })) yield* previous.started const next = yield* llm.gate() yield* previous.release yield* Fiber.join(first)
const second = yield* llm.generate(request).pipe(Effect.forkChild({ startImmediately: true })) yield* next.started expect(second.pollUnsafe()).toBeUndefined() yield* next.release yield* Fiber.join(second) }), )
it.effect("releases a gate when its deliberately narrower scope closes", () => Effect.gen(function* () { const llm = yield* TestLLM.Test yield* llm.always(TestLLM.stop()) // Only the gate is scoped here; its release must happen before the test ends. const run = yield* Effect.scoped( Effect.gen(function* () { const gate = yield* llm.gate() const run = yield* llm.generate(request).pipe(Effect.forkChild({ startImmediately: true })) yield* gate.started return run }), ) yield* Fiber.join(run) yield* llm.generate(request) expect(yield* llm.requests()).toHaveLength(2) }), )
it.effect("keeps an executed response consumed after interruption and permits later requests", () => Effect.gen(function* () { const llm = yield* TestLLM.Test yield* llm.push(TestLLM.text("interrupted", "first"), TestLLM.text("next", "second")) const gate = yield* llm.gate() const run = yield* llm.generate(request).pipe(Effect.forkChild({ startImmediately: true })) yield* gate.started yield* Fiber.interrupt(run) yield* gate.release expect((yield* llm.generate(request)).text).toBe("next") expect(yield* llm.requests()).toHaveLength(2) }), )
it.effect("consumes a supplied stream's post-finish tail and runs its finalizer", () => Effect.gen(function* () { const llm = yield* TestLLM.Test const tail = yield* Latch.make() const release = yield* Latch.make() const finalized = yield* Latch.make() yield* llm.push( Stream.unwrap( Effect.gen(function* () { yield* Effect.addFinalizer(() => finalized.open) return Stream.fromIterable(TestLLM.text("complete", "answer")).pipe( Stream.concat(Stream.fromEffect(tail.open.pipe(Effect.andThen(release.await))).pipe(Stream.drain)), ) }), ), ) const run = yield* llm.generate(request).pipe(Effect.forkChild({ startImmediately: true })) yield* tail.await expect(run.pollUnsafe()).toBeUndefined() yield* release.open expect((yield* Fiber.join(run)).text).toBe("complete") yield* finalized.await }), )
it.effect("preserves irregular events, ordinary EOF, typed failures, and responder defects", () => Effect.gen(function* () { const llm = yield* TestLLM.Test const events = [LLMEvent.textDelta({ id: "without-start", text: "partial" })] yield* llm.push(events, []) expect(yield* Stream.runCollect(llm.stream(request))).toEqual(events) expect(yield* Stream.runCollect(llm.stream(request))).toEqual([])
const failure = new AIError({ reason: new RateLimitError({ message: "Try later" }) }) const observed: LLMEvent[] = [] yield* llm.serve(() => TestLLM.failAfter(failure, ...events)) expect( yield* llm.stream(request).pipe( Stream.runForEach((event) => Effect.sync(() => observed.push(event))), Effect.flip, ), ).toBe(failure) expect(observed).toEqual(events) expect(yield* llm.generate(request).pipe(Effect.flip)).toBe(failure)
const defect = new Error("Broken fixture responder") yield* llm.serve(() => { throw defect }) expect(yield* llm.generate(request).pipe(Effect.catchDefect(Effect.succeed))).toBe(defect) yield* llm.push(TestLLM.text("recovered", "answer")) expect((yield* llm.generate(request)).text).toBe("recovered") }), )
it.effect("defects on unexpected requests instead of waiting for a late script", () => Effect.gen(function* () { const llm = yield* TestLLM.Test const defect = yield* llm.generate(request).pipe(Effect.catchDefect(Effect.succeed)) expect(defect).toBeInstanceOf(Error) if (!(defect instanceof Error)) return expect(defect.message).toBe("TestLLM has no response for request 1") expect(yield* llm.requests()).toEqual([request]) yield* llm.push(TestLLM.stop()) yield* llm.generate(request) }), )})