diff --git a/src/create-managers.test.ts b/src/create-managers.test.ts
index 94a18460d..fa32bca4e 100644
--- a/src/create-managers.test.ts
+++ b/src/create-managers.test.ts
@@ -1,8 +1,12 @@
 /// <reference types="bun-types" />
 
-import { afterAll, beforeEach, describe, expect, it, mock, spyOn } from "bun:test"
+import { afterEach, beforeEach, describe, expect, it, mock, spyOn } from "bun:test"
+import type { PluginInput } from "@opencode-ai/plugin"
 
+import { OhMyOpenCodeConfigSchema } from "./config/schema/oh-my-opencode-config"
+import { createManagers } from "./create-managers"
 import * as openclawRuntimeDispatch from "./openclaw/runtime-dispatch"
+import { createModelCacheState } from "./plugin-state"
 
 const markServerRunningInProcess = mock(() => {})
 let backgroundManagerOptions: {
@@ -10,57 +14,63 @@ let backgroundManagerOptions: {
 } | null = null
 const trackedPaneBySession = new Map<string, string>()
 
-mock.module("./features/background-agent", () => ({
-  BackgroundManager: class BackgroundManager {
-    constructor(_ctx: unknown, _config: unknown, options: typeof backgroundManagerOptions) {
-      backgroundManagerOptions = options
+class MockBackgroundManager {
+  constructor(
+    _ctx: PluginInput,
+    _config?: unknown,
+    options?: {
+      tmuxConfig?: unknown
+      onSubagentSessionCreated?: (event: { sessionID: string; parentID: string; title: string }) => Promise<void>
+      onShutdown?: () => void | Promise<void>
+      enableParentSessionNotifications?: boolean
+    },
+  ) {
+    backgroundManagerOptions = options ?? null
+  }
+}
+
+class MockSkillMcpManager {
+  constructor(..._args: unknown[]) {}
+}
+
+class MockTmuxSessionManager {
+  constructor(_ctx: PluginInput, _config: unknown) {}
+
+  async cleanup(): Promise<void> {}
+
+  async onSessionCreated(event: { properties?: { info?: { id?: string } } }): Promise<void> {
+    const sessionID = event.properties?.info?.id
+    if (sessionID) {
+      trackedPaneBySession.set(sessionID, `%pane-${sessionID}`)
     }
-  },
-}))
+  }
 
-mock.module("./features/skill-mcp-manager", () => ({
-  SkillMcpManager: class SkillMcpManager {
-    constructor(..._args: unknown[]) {}
-  },
-}))
+  getTrackedPaneId(sessionID: string): string | undefined {
+    return trackedPaneBySession.get(sessionID)
+  }
+}
 
-mock.module("./features/task-toast-manager", () => ({
-  initTaskToastManager: mock(() => {}),
-}))
+function createConfigHandler(): ReturnType<typeof import("./plugin-handlers").createConfigHandler> {
+  return async () => {}
+}
 
-mock.module("./features/tmux-subagent", () => ({
-  TmuxSessionManager: class TmuxSessionManager {
-    constructor(..._args: unknown[]) {}
+function initTaskToastManager(): ReturnType<typeof import("./features/task-toast-manager").initTaskToastManager> {
+  return {} as ReturnType<typeof import("./features/task-toast-manager").initTaskToastManager>
+}
 
-    async cleanup(): Promise<void> {}
-    async onSessionCreated(event: { properties?: { info?: { id?: string } } }): Promise<void> {
-      const sessionID = event.properties?.info?.id
-      if (sessionID) {
-        trackedPaneBySession.set(sessionID, `%pane-${sessionID}`)
-      }
-    }
+function registerManagerForCleanup(): void {}
 
-    getTrackedPaneId(sessionID: string): string | undefined {
-      return trackedPaneBySession.get(sessionID)
-    }
-  },
-}))
-
-mock.module("./features/background-agent/process-cleanup", () => ({
-  registerManagerForCleanup: mock(() => {}),
-}))
-
-mock.module("./plugin-handlers", () => ({
-  createConfigHandler: mock(() => ({ kind: "config-handler" })),
-}))
-
-mock.module("./shared/tmux/tmux-utils/server-health", () => ({
-  isServerRunning: mock(async () => true),
-  markServerRunningInProcess,
-  resetServerCheck: mock(() => {}),
-}))
-
-const { createManagers } = await import("./create-managers")
+function createDeps(): NonNullable<Parameters<typeof createManagers>[0]["deps"]> {
+  return {
+    BackgroundManagerClass: MockBackgroundManager as typeof import("./features/background-agent").BackgroundManager,
+    SkillMcpManagerClass: MockSkillMcpManager as typeof import("./features/skill-mcp-manager").SkillMcpManager,
+    TmuxSessionManagerClass: MockTmuxSessionManager as typeof import("./features/tmux-subagent").TmuxSessionManager,
+    initTaskToastManagerFn: initTaskToastManager,
+    registerManagerForCleanupFn: registerManagerForCleanup,
+    createConfigHandlerFn: createConfigHandler,
+    markServerRunningInProcessFn: markServerRunningInProcess,
+  }
+}
 
 function createTmuxConfig(enabled: boolean) {
   return {
@@ -73,28 +83,67 @@ function createTmuxConfig(enabled: boolean) {
   }
 }
 
+function createContext(directory: string): PluginInput {
+  const shell = Object.assign(
+    () => {
+      throw new Error("shell should not be called in this test")
+    },
+    {
+      braces: () => [],
+      escape: (input: string) => input,
+      env() {
+        return shell
+      },
+      cwd() {
+        return shell
+      },
+      nothrow() {
+        return shell
+      },
+      throws() {
+        return shell
+      },
+    },
+  )
+
+  return {
+    project: {
+      id: "project-id",
+      worktree: directory,
+      time: { created: Date.now() },
+    },
+    directory,
+    worktree: directory,
+    serverUrl: new URL("http://localhost:4096"),
+    $: shell,
+    client: {} as PluginInput["client"],
+  }
+}
+
 describe("createManagers", () => {
-  const dispatchOpenClawEvent = spyOn(openclawRuntimeDispatch, "dispatchOpenClawEvent")
+  let dispatchOpenClawEvent: ReturnType<typeof spyOn>
 
   beforeEach(() => {
+    dispatchOpenClawEvent = spyOn(openclawRuntimeDispatch, "dispatchOpenClawEvent")
     markServerRunningInProcess.mockClear()
     dispatchOpenClawEvent.mockReset()
     backgroundManagerOptions = null
     trackedPaneBySession.clear()
   })
 
-  afterAll(() => {
-    mock.restore()
+  afterEach(() => {
+    dispatchOpenClawEvent.mockRestore()
   })
 
   it("#given tmux integration is disabled #when managers are created #then it does not mark the tmux server as running", () => {
     const args = {
-      ctx: { directory: "/tmp", client: {} },
-      pluginConfig: {},
+      ctx: createContext("/tmp"),
+      pluginConfig: OhMyOpenCodeConfigSchema.parse({}),
       tmuxConfig: createTmuxConfig(false),
-      modelCacheState: {},
+      modelCacheState: createModelCacheState(),
       backgroundNotificationHookEnabled: false,
-    } as Parameters<typeof createManagers>[0]
+      deps: createDeps(),
+    }
 
     createManagers(args)
 
@@ -103,12 +152,13 @@ describe("createManagers", () => {
 
   it("#given tmux integration is enabled #when managers are created #then it marks the tmux server as running", () => {
     const args = {
-      ctx: { directory: "/tmp", client: {} },
-      pluginConfig: {},
+      ctx: createContext("/tmp"),
+      pluginConfig: OhMyOpenCodeConfigSchema.parse({}),
       tmuxConfig: createTmuxConfig(true),
-      modelCacheState: {},
+      modelCacheState: createModelCacheState(),
       backgroundNotificationHookEnabled: false,
-    } as Parameters<typeof createManagers>[0]
+      deps: createDeps(),
+    }
 
     createManagers(args)
 
@@ -117,18 +167,19 @@ describe("createManagers", () => {
 
   it("#given openclaw is enabled #when the background session-created callback runs #then it dispatches openclaw with the tracked pane id", async () => {
     const args = {
-      ctx: { directory: "/tmp/project", client: {} },
-      pluginConfig: {
+      ctx: createContext("/tmp/project"),
+      pluginConfig: OhMyOpenCodeConfigSchema.parse({
         openclaw: {
           enabled: true,
           gateways: {},
           hooks: {},
         },
-      },
+      }),
       tmuxConfig: createTmuxConfig(true),
-      modelCacheState: {},
+      modelCacheState: createModelCacheState(),
       backgroundNotificationHookEnabled: false,
-    } as Parameters<typeof createManagers>[0]
+      deps: createDeps(),
+    }
 
     createManagers(args)
 
diff --git a/src/index.test.ts b/src/index.test.ts
index e9d4baee3..7101b9f09 100644
--- a/src/index.test.ts
+++ b/src/index.test.ts
@@ -1,4 +1,4 @@
-import { afterAll, beforeEach, describe, expect, it, mock } from "bun:test"
+import { afterEach, beforeEach, describe, expect, it, mock } from "bun:test"
 
 describe("experimental.session.compacting handler", () => {
   function createCompactingHandler(hooks: {
@@ -257,83 +257,87 @@ const mockCreatePluginInterface = mock(() => ({}))
 const mockInitializeOpenClaw = mock(async () => {})
 const mockStartTmuxCheck = mock(() => {})
 
-mock.module("./cli/config-manager/config-context", () => ({
-  initConfigContext: mockInitConfigContext,
-}))
+let OhMyOpenCodePlugin: (typeof import("./index"))["default"]
 
-mock.module("./shared/external-plugin-detector", () => ({
-  detectExternalSkillPlugin: mockDetectExternalSkillPlugin,
-  getSkillPluginConflictWarning: mockGetSkillPluginConflictWarning,
-}))
+function installIndexModuleMocks(): void {
+  mock.module("./cli/config-manager/config-context", () => ({
+    initConfigContext: mockInitConfigContext,
+  }))
 
-mock.module("./shared", () => ({
-  injectServerAuthIntoClient: mockInjectServerAuthIntoClient,
-  log: mock(() => {}),
-  logLegacyPluginStartupWarning: mockLogLegacyPluginStartupWarning,
-}))
+  mock.module("./shared/external-plugin-detector", () => ({
+    detectExternalSkillPlugin: mockDetectExternalSkillPlugin,
+    getSkillPluginConflictWarning: mockGetSkillPluginConflictWarning,
+  }))
 
-mock.module("./plugin-config", () => ({
-  loadPluginConfig: mockLoadPluginConfig,
-}))
+  mock.module("./shared", () => ({
+    injectServerAuthIntoClient: mockInjectServerAuthIntoClient,
+    log: mock(() => {}),
+    logLegacyPluginStartupWarning: mockLogLegacyPluginStartupWarning,
+  }))
 
-mock.module("./create-runtime-tmux-config", () => ({
-  createRuntimeTmuxConfig: mockCreateRuntimeTmuxConfig,
-  isTmuxIntegrationEnabled: mockIsTmuxIntegrationEnabled,
-  isInteractiveBashEnabled: mockIsInteractiveBashEnabled,
-}))
+  mock.module("./plugin-config", () => ({
+    loadPluginConfig: mockLoadPluginConfig,
+  }))
 
-mock.module("./create-managers", () => ({
-  createManagers: mockCreateManagers,
-}))
+  mock.module("./create-runtime-tmux-config", () => ({
+    createRuntimeTmuxConfig: mockCreateRuntimeTmuxConfig,
+    isTmuxIntegrationEnabled: mockIsTmuxIntegrationEnabled,
+    isInteractiveBashEnabled: mockIsInteractiveBashEnabled,
+  }))
 
-mock.module("./create-tools", () => ({
-  createTools: mockCreateTools,
-}))
+  mock.module("./create-managers", () => ({
+    createManagers: mockCreateManagers,
+  }))
 
-mock.module("./create-hooks", () => ({
-  createHooks: mockCreateHooks,
-}))
+  mock.module("./create-tools", () => ({
+    createTools: mockCreateTools,
+  }))
 
-mock.module("./plugin-dispose", () => ({
-  createPluginDispose: mockCreatePluginDispose,
-}))
+  mock.module("./create-hooks", () => ({
+    createHooks: mockCreateHooks,
+  }))
 
-mock.module("./plugin-interface", () => ({
-  createPluginInterface: mockCreatePluginInterface,
-}))
+  mock.module("./plugin-dispose", () => ({
+    createPluginDispose: mockCreatePluginDispose,
+  }))
 
-mock.module("./plugin-state", () => ({
-  createModelCacheState: mock(() => ({})),
-}))
+  mock.module("./plugin-interface", () => ({
+    createPluginInterface: mockCreatePluginInterface,
+  }))
 
-mock.module("./shared/first-message-variant", () => ({
-  createFirstMessageVariantGate: mock(() => ({
-    shouldOverride: () => false,
-    markApplied: () => {},
-    markSessionCreated: () => {},
-    clear: () => {},
-  })),
-}))
+  mock.module("./plugin-state", () => ({
+    createModelCacheState: mock(() => ({})),
+  }))
 
-mock.module("./openclaw", () => ({
-  initializeOpenClaw: mockInitializeOpenClaw,
-}))
+  mock.module("./shared/first-message-variant", () => ({
+    createFirstMessageVariantGate: mock(() => ({
+      shouldOverride: () => false,
+      markApplied: () => {},
+      markSessionCreated: () => {},
+      clear: () => {},
+    })),
+  }))
 
-mock.module("./tools/interactive-bash", () => ({
-  interactive_bash: {},
-  startBackgroundCheck: mockStartTmuxCheck,
-}))
+  mock.module("./openclaw", () => ({
+    initializeOpenClaw: mockInitializeOpenClaw,
+  }))
 
-mock.module("./tools/lsp/client", () => ({
-  lspManager: {
-    cleanupTempDirectoryClients: async () => {},
-  },
-}))
+  mock.module("./tools/interactive-bash", () => ({
+    interactive_bash: {},
+    startBackgroundCheck: mockStartTmuxCheck,
+  }))
 
-const { default: OhMyOpenCodePlugin } = await import("./index")
+}
+
+async function importFreshIndexModule(): Promise<typeof import("./index")> {
+  return import(`./index?test=${Date.now()}-${Math.random()}`)
+}
 
 describe("OhMyOpenCodePlugin", () => {
-  beforeEach(() => {
+  beforeEach(async () => {
+    mock.restore()
+    installIndexModuleMocks()
+    ;({ default: OhMyOpenCodePlugin } = await importFreshIndexModule())
     mockInitConfigContext.mockClear()
     mockDetectExternalSkillPlugin.mockClear()
     mockGetSkillPluginConflictWarning.mockClear()
@@ -352,7 +356,7 @@ describe("OhMyOpenCodePlugin", () => {
     mockStartTmuxCheck.mockClear()
   })
 
-  afterAll(() => {
+  afterEach(() => {
     mock.restore()
   })
 
diff --git a/test-setup.ts b/test-setup.ts
index 6bb51814b..e66350edb 100644
--- a/test-setup.ts
+++ b/test-setup.ts
@@ -1,10 +1,57 @@
-import { beforeEach } from "bun:test"
+import { afterEach, beforeEach, mock } from "bun:test"
+import { rmSync } from "node:fs"
 import { _resetForTesting as resetClaudeSessionState } from "./src/features/claude-code-session-state/state"
+import { _resetTaskToastManagerForTesting as resetTaskToastManager } from "./src/features/task-toast-manager/manager"
 import { _resetForTesting as resetModelFallbackState } from "./src/hooks/model-fallback/hook"
 import { _resetMemCacheForTesting as resetConnectedProvidersCache } from "./src/shared/connected-providers-cache"
+import { getOmoOpenCodeCacheDir } from "./src/shared/data-path"
+import { installModuleMockLifecycle } from "./src/testing/module-mock-lifecycle"
+
+const { restoreModuleMocks } = installModuleMockLifecycle(mock)
+let environmentSnapshot: NodeJS.ProcessEnv = { ...process.env }
+let workingDirectorySnapshot = process.cwd()
+
+function cleanupOmoCacheDir(cacheDir: string): void {
+  rmSync(cacheDir, { recursive: true, force: true })
+}
 
 beforeEach(() => {
+  environmentSnapshot = { ...process.env }
+  workingDirectorySnapshot = process.cwd()
+  process.env.OMO_DISABLE_POSTHOG = "true"
+  cleanupOmoCacheDir(getOmoOpenCodeCacheDir())
   resetClaudeSessionState()
+  resetTaskToastManager()
   resetModelFallbackState()
   resetConnectedProvidersCache()
 })
+
+afterEach(() => {
+  const currentCacheDir = getOmoOpenCodeCacheDir()
+
+  for (const key of Object.keys(process.env)) {
+    if (!(key in environmentSnapshot)) {
+      delete process.env[key]
+    }
+  }
+
+  for (const [key, value] of Object.entries(environmentSnapshot)) {
+    if (value === undefined) {
+      delete process.env[key]
+      continue
+    }
+
+    process.env[key] = value
+  }
+
+  if (process.cwd() !== workingDirectorySnapshot) {
+    process.chdir(workingDirectorySnapshot)
+  }
+
+  cleanupOmoCacheDir(currentCacheDir)
+  cleanupOmoCacheDir(getOmoOpenCodeCacheDir())
+  resetTaskToastManager()
+  resetConnectedProvidersCache()
+  mock.restore()
+  restoreModuleMocks()
+})