opencode-ide-plugin/packages/opencode/test/session/structured-output-integration.test.ts

import { describe, expect, test } from "bun:test"
import path from "path"
import { Session } from "../../src/session"
import { SessionPrompt } from "../../src/session/prompt"
import { Log } from "../../src/util/log"
import { Instance } from "../../src/project/instance"
import { MessageV2 } from "../../src/session/message-v2"

const projectRoot = path.join(__dirname, "../..")
Log.init({ print: false })

// Skip tests if no API key is available
const hasApiKey = !!process.env.ANTHROPIC_API_KEY

// Helper to run test within Instance context
async function withInstance<T>(fn: () => Promise<T>): Promise<T> {
  return Instance.provide({
    directory: projectRoot,
    fn,
  })
}

describe("StructuredOutput Integration", () => {
  test.skipIf(!hasApiKey)(
    "produces structured output with simple schema",
    async () => {
      await withInstance(async () => {
        const session = await Session.create({ title: "Structured Output Test" })

        const result = await SessionPrompt.prompt({
          sessionID: session.id,
          parts: [
            {
              type: "text",
              text: "What is 2 + 2? Provide a simple answer.",
            },
          ],
          format: {
            type: "json_schema",
            schema: {
              type: "object",
              properties: {
                answer: { type: "number", description: "The numerical answer" },
                explanation: { type: "string", description: "Brief explanation" },
              },
              required: ["answer"],
            },
            retryCount: 0,
          },
        })

        // Verify structured output was captured (only on assistant messages)
        expect(result.info.role).toBe("assistant")
        if (result.info.role === "assistant") {
          expect(result.info.structured).toBeDefined()
          expect(typeof result.info.structured).toBe("object")

          const output = result.info.structured as any
          expect(output.answer).toBe(4)

          // Verify no error was set
          expect(result.info.error).toBeUndefined()
        }

        // Clean up
        // Note: Not removing session to avoid race with background SessionSummary.summarize
      })
    },
    60000,
  )

  test.skipIf(!hasApiKey)(
    "produces structured output with nested objects",
    async () => {
      await withInstance(async () => {
        const session = await Session.create({ title: "Nested Schema Test" })

        const result = await SessionPrompt.prompt({
          sessionID: session.id,
          parts: [
            {
              type: "text",
              text: "Tell me about Anthropic company in a structured format.",
            },
          ],
          format: {
            type: "json_schema",
            schema: {
              type: "object",
              properties: {
                company: {
                  type: "object",
                  properties: {
                    name: { type: "string" },
                    founded: { type: "number" },
                  },
                  required: ["name", "founded"],
                },
                products: {
                  type: "array",
                  items: { type: "string" },
                },
              },
              required: ["company"],
            },
            retryCount: 0,
          },
        })

        // Verify structured output was captured (only on assistant messages)
        expect(result.info.role).toBe("assistant")
        if (result.info.role === "assistant") {
          expect(result.info.structured).toBeDefined()
          const output = result.info.structured as any

          expect(output.company).toBeDefined()
          expect(output.company.name).toBe("Anthropic")
          expect(typeof output.company.founded).toBe("number")

          if (output.products) {
            expect(Array.isArray(output.products)).toBe(true)
          }

          // Verify no error was set
          expect(result.info.error).toBeUndefined()
        }

        // Clean up
        // Note: Not removing session to avoid race with background SessionSummary.summarize
      })
    },
    60000,
  )

  test.skipIf(!hasApiKey)(
    "works with text outputFormat (default)",
    async () => {
      await withInstance(async () => {
        const session = await Session.create({ title: "Text Output Test" })

        const result = await SessionPrompt.prompt({
          sessionID: session.id,
          parts: [
            {
              type: "text",
              text: "Say hello.",
            },
          ],
          format: {
            type: "text",
          },
        })

        // Verify no structured output (text mode) and no error
        expect(result.info.role).toBe("assistant")
        if (result.info.role === "assistant") {
          expect(result.info.structured).toBeUndefined()
          expect(result.info.error).toBeUndefined()
        }

        // Verify we got a response with parts
        expect(result.parts.length).toBeGreaterThan(0)

        // Clean up
        // Note: Not removing session to avoid race with background SessionSummary.summarize
      })
    },
    60000,
  )

  test.skipIf(!hasApiKey)(
    "stores outputFormat on user message",
    async () => {
      await withInstance(async () => {
        const session = await Session.create({ title: "OutputFormat Storage Test" })

        await SessionPrompt.prompt({
          sessionID: session.id,
          parts: [
            {
              type: "text",
              text: "What is 1 + 1?",
            },
          ],
          format: {
            type: "json_schema",
            schema: {
              type: "object",
              properties: {
                result: { type: "number" },
              },
              required: ["result"],
            },
            retryCount: 3,
          },
        })

        // Get all messages from session
        const messages = await Session.messages({ sessionID: session.id })
        const userMessage = messages.find((m) => m.info.role === "user")

        // Verify outputFormat was stored on user message
        expect(userMessage).toBeDefined()
        if (userMessage?.info.role === "user") {
          expect(userMessage.info.format).toBeDefined()
          expect(userMessage.info.format?.type).toBe("json_schema")
          if (userMessage.info.format?.type === "json_schema") {
            expect(userMessage.info.format.retryCount).toBe(3)
          }
        }

        // Clean up
        // Note: Not removing session to avoid race with background SessionSummary.summarize
      })
    },
    60000,
  )

  test("unit test: StructuredOutputError is properly structured", () => {
    const error = new MessageV2.StructuredOutputError({
      message: "Failed to produce valid structured output after 3 attempts",
      retries: 3,
    })

    expect(error.name).toBe("StructuredOutputError")
    expect(error.data.message).toContain("3 attempts")
    expect(error.data.retries).toBe(3)

    const obj = error.toObject()
    expect(obj.name).toBe("StructuredOutputError")
    expect(obj.data.retries).toBe(3)
  })
})