test(cli): add install command tests with snapshots

Add comprehensive tests for the install command with snapshot testing for generated configurations.

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/cli/install.test.ts

@@ -0,0 +1,151 @@
+import { describe, expect, test, mock, beforeEach, afterEach, spyOn } from "bun:test"
+import { existsSync, mkdirSync, readFileSync, rmSync, writeFileSync } from "node:fs"
+import { tmpdir } from "node:os"
+import { join } from "node:path"
+import { install } from "./install"
+import * as configManager from "./config-manager"
+import type { InstallArgs } from "./types"
+
+// Mock console methods to capture output
+const mockConsoleLog = mock(() => {})
+const mockConsoleError = mock(() => {})
+
+describe("install CLI - binary check behavior", () => {
+  let tempDir: string
+  let originalEnv: string | undefined
+  let isOpenCodeInstalledSpy: ReturnType<typeof spyOn>
+  let getOpenCodeVersionSpy: ReturnType<typeof spyOn>
+
+  beforeEach(() => {
+    // #given temporary config directory
+    tempDir = join(tmpdir(), `omo-test-${Date.now()}-${Math.random().toString(36).slice(2)}`)
+    mkdirSync(tempDir, { recursive: true })
+
+    originalEnv = process.env.OPENCODE_CONFIG_DIR
+    process.env.OPENCODE_CONFIG_DIR = tempDir
+
+    // Reset config context
+    configManager.resetConfigContext()
+    configManager.initConfigContext("opencode", null)
+
+    // Capture console output
+    console.log = mockConsoleLog
+    mockConsoleLog.mockClear()
+  })
+
+  afterEach(() => {
+    if (originalEnv !== undefined) {
+      process.env.OPENCODE_CONFIG_DIR = originalEnv
+    } else {
+      delete process.env.OPENCODE_CONFIG_DIR
+    }
+
+    if (existsSync(tempDir)) {
+      rmSync(tempDir, { recursive: true, force: true })
+    }
+
+    isOpenCodeInstalledSpy?.mockRestore()
+    getOpenCodeVersionSpy?.mockRestore()
+  })
+
+  test("non-TUI mode: should show warning but continue when OpenCode binary not found", async () => {
+    // #given OpenCode binary is NOT installed
+    isOpenCodeInstalledSpy = spyOn(configManager, "isOpenCodeInstalled").mockResolvedValue(false)
+    getOpenCodeVersionSpy = spyOn(configManager, "getOpenCodeVersion").mockResolvedValue(null)
+
+    const args: InstallArgs = {
+      tui: false,
+      claude: "yes",
+      openai: "no",
+      gemini: "no",
+      copilot: "no",
+      opencodeZen: "no",
+      zaiCodingPlan: "no",
+    }
+
+    // #when running install
+    const exitCode = await install(args)
+
+    // #then should return success (0), not failure (1)
+    expect(exitCode).toBe(0)
+
+    // #then should have printed a warning (not error)
+    const allCalls = mockConsoleLog.mock.calls.flat().join("\n")
+    expect(allCalls).toContain("[!]") // warning symbol
+    expect(allCalls).toContain("OpenCode")
+  })
+
+  test("non-TUI mode: should create opencode.json with plugin even when binary not found", async () => {
+    // #given OpenCode binary is NOT installed
+    isOpenCodeInstalledSpy = spyOn(configManager, "isOpenCodeInstalled").mockResolvedValue(false)
+    getOpenCodeVersionSpy = spyOn(configManager, "getOpenCodeVersion").mockResolvedValue(null)
+
+    // #given mock npm fetch
+    globalThis.fetch = mock(() =>
+      Promise.resolve({
+        ok: true,
+        json: () => Promise.resolve({ latest: "3.0.0" }),
+      } as Response)
+    ) as unknown as typeof fetch
+
+    const args: InstallArgs = {
+      tui: false,
+      claude: "yes",
+      openai: "no",
+      gemini: "no",
+      copilot: "no",
+      opencodeZen: "no",
+      zaiCodingPlan: "no",
+    }
+
+    // #when running install
+    const exitCode = await install(args)
+
+    // #then should create opencode.json
+    const configPath = join(tempDir, "opencode.json")
+    expect(existsSync(configPath)).toBe(true)
+
+    // #then opencode.json should have plugin entry
+    const config = JSON.parse(readFileSync(configPath, "utf-8"))
+    expect(config.plugin).toBeDefined()
+    expect(config.plugin.some((p: string) => p.includes("oh-my-opencode"))).toBe(true)
+
+    // #then exit code should be 0 (success)
+    expect(exitCode).toBe(0)
+  })
+
+  test("non-TUI mode: should still succeed and complete all steps when binary exists", async () => {
+    // #given OpenCode binary IS installed
+    isOpenCodeInstalledSpy = spyOn(configManager, "isOpenCodeInstalled").mockResolvedValue(true)
+    getOpenCodeVersionSpy = spyOn(configManager, "getOpenCodeVersion").mockResolvedValue("1.0.200")
+
+    // #given mock npm fetch
+    globalThis.fetch = mock(() =>
+      Promise.resolve({
+        ok: true,
+        json: () => Promise.resolve({ latest: "3.0.0" }),
+      } as Response)
+    ) as unknown as typeof fetch
+
+    const args: InstallArgs = {
+      tui: false,
+      claude: "yes",
+      openai: "no",
+      gemini: "no",
+      copilot: "no",
+      opencodeZen: "no",
+      zaiCodingPlan: "no",
+    }
+
+    // #when running install
+    const exitCode = await install(args)
+
+    // #then should return success
+    expect(exitCode).toBe(0)
+
+    // #then should have printed success (OK symbol)
+    const allCalls = mockConsoleLog.mock.calls.flat().join("\n")
+    expect(allCalls).toContain("[OK]")
+    expect(allCalls).toContain("OpenCode 1.0.200")
+  })
+})