opencode/packages/core/test/plugin/provider-cohere.test.ts

import { describe, expect, mock } from "bun:test"
import { Effect } from "effect"
import { ModelV2 } from "@opencode-ai/core/model"
import { PluginV2 } from "@opencode-ai/core/plugin"
import { PluginHost } from "@opencode-ai/core/plugin/host"
import { CoherePlugin } from "@opencode-ai/core/plugin/provider/cohere"
import { ProviderV2 } from "@opencode-ai/core/provider"
import type { LanguageModelV3 } from "@ai-sdk/provider"
import { testEffect } from "../lib/effect"
import { PluginTestLayer } from "./fixture"

const cohereOptions: Record<string, any>[] = []
const it = testEffect(PluginTestLayer)

const addPlugin = Effect.fn(function* () {
  const plugin = yield* PluginV2.Service
  const host = yield* PluginHost.make()
  yield* plugin.add({ id: CoherePlugin.id, effect: CoherePlugin.effect(host) })
})

function fakeSelectorSdk(calls: string[]) {
  const make = (method: string) => (id: string) => {
    calls.push(`${method}:${id}`)
    return { modelId: id, provider: method, specificationVersion: "v3" } as unknown as LanguageModelV3
  }
  return {
    responses: make("responses"),
    messages: make("messages"),
    chat: make("chat"),
    languageModel: make("languageModel"),
  }
}

void mock.module("@ai-sdk/cohere", () => ({
  createCohere: (options: Record<string, any>) => {
    cohereOptions.push({ ...options })
    return {
      languageModel: (modelID: string) => ({
        modelID,
        provider: `${options.name ?? "cohere"}.chat`,
        specificationVersion: "v3",
      }),
    }
  },
}))

describe("CoherePlugin", () => {
  it.effect("creates a Cohere SDK only for @ai-sdk/cohere", () =>
    Effect.gen(function* () {
      const plugin = yield* PluginV2.Service
      yield* addPlugin()

      const ignored = yield* plugin.trigger(
        "aisdk.sdk",
        {
          model: new ModelV2.Info({
            ...ModelV2.Info.empty(ProviderV2.ID.make("cohere"), ModelV2.ID.make("command")),
            api: { id: ModelV2.ID.make("command"), type: "aisdk", package: "test-provider" },
          }),
          package: "@ai-sdk/openai-compatible",
          options: { name: "cohere" },
        },
        {},
      )
      expect(ignored.sdk).toBeUndefined()

      const result = yield* plugin.trigger(
        "aisdk.sdk",
        {
          model: new ModelV2.Info({
            ...ModelV2.Info.empty(ProviderV2.ID.make("cohere"), ModelV2.ID.make("command")),
            api: { id: ModelV2.ID.make("command"), type: "aisdk", package: "test-provider" },
          }),
          package: "@ai-sdk/cohere",
          options: { name: "cohere" },
        },
        {},
      )
      expect(result.sdk).toBeDefined()
    }),
  )

  it.effect("uses the model provider ID as the bundled SDK name", () =>
    Effect.gen(function* () {
      const plugin = yield* PluginV2.Service
      yield* addPlugin()
      const result = yield* plugin.trigger(
        "aisdk.sdk",
        {
          model: new ModelV2.Info({
            ...ModelV2.Info.empty(ProviderV2.ID.make("custom-cohere"), ModelV2.ID.make("command-r-plus")),
            api: { id: ModelV2.ID.make("command-r-plus"), type: "aisdk", package: "test-provider" },
          }),
          package: "@ai-sdk/cohere",
          options: { name: "custom-cohere", apiKey: "test", baseURL: "https://cohere.example" },
        },
        {},
      )

      expect(cohereOptions.at(-1)).toEqual({
        name: "custom-cohere",
        apiKey: "test",
        baseURL: "https://cohere.example",
      })
      expect(result.sdk?.languageModel("command-r-plus").provider).toBe("custom-cohere.chat")
    }),
  )

  it.effect("leaves language selection to the default languageModel fallback", () =>
    Effect.gen(function* () {
      const plugin = yield* PluginV2.Service
      const calls: string[] = []
      const sdk = fakeSelectorSdk(calls)
      yield* addPlugin()
      const result = yield* plugin.trigger(
        "aisdk.language",
        {
          model: new ModelV2.Info({
            ...ModelV2.Info.empty(ProviderV2.ID.make("cohere"), ModelV2.ID.make("alias")),
            api: { id: ModelV2.ID.make("command-r-plus"), type: "aisdk", package: "test-provider" },
          }),
          sdk,
          options: {},
        },
        {},
      )

      expect(result.language).toBeUndefined()
      expect(calls).toEqual([])
      expect(result.language ?? sdk.languageModel("command-r-plus")).toBeDefined()
      expect(calls).toEqual(["languageModel:command-r-plus"])
    }),
  )
})