diff --git a/packages/engine-chronocat-api/tests/messager/fixtures/img/__snapshots__/index.test.ts.snap b/packages/engine-chronocat-api/tests/messager/fixtures/img/__snapshots__/index.test.ts.snap
new file mode 100644
index 0000000..2728c4f
--- /dev/null
+++ b/packages/engine-chronocat-api/tests/messager/fixtures/img/__snapshots__/index.test.ts.snap
@@ -0,0 +1,69 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`Red 编码器应当正确编码 图片消息 1`] = `
+[
+  [
+    {
+      "chatType": 2,
+      "guildId": "",
+      "peerUid": "9998",
+    },
+    [
+      {
+        "elementId": "",
+        "elementType": 1,
+        "textElement": {
+          "atNtUid": "",
+          "atTinyId": "",
+          "atType": 0,
+          "atUid": "",
+          "content": "xxx",
+        },
+      },
+      {
+        "elementId": "",
+        "elementType": 2,
+        "extBufForUI": "",
+        "picElement": {
+          "fileName": "",
+          "fileSize": "0",
+          "fileSubId": "",
+          "fileUuid": "",
+          "md5HexStr": "",
+          "original": true,
+          "picHeight": 0,
+          "picSubType": 0,
+          "picType": 1001,
+          "picWidth": 0,
+          "sourcePath": "",
+          "summary": "",
+          "thumbFileSize": 0,
+        },
+      },
+      {
+        "elementId": "",
+        "elementType": 1,
+        "textElement": {
+          "atNtUid": "",
+          "atTinyId": "",
+          "atType": 0,
+          "atUid": "",
+          "content": "yyy",
+        },
+      },
+    ],
+  ],
+]
+`;
+
+exports[`Red 编码器应当正确编码 图片消息 2`] = `
+[
+  [
+    "file:///D:/Projects/chrononeko/chronocat02/packages/engine-chronocat-api/docs/static/chronocat.png",
+    {
+      "fileMime": undefined,
+      "fileName": undefined,
+    },
+  ],
+]
+`;
diff --git a/packages/engine-chronocat-api/tests/messager/fixtures/img/index.test.ts b/packages/engine-chronocat-api/tests/messager/fixtures/img/index.test.ts
new file mode 100644
index 0000000..2410008
--- /dev/null
+++ b/packages/engine-chronocat-api/tests/messager/fixtures/img/index.test.ts
@@ -0,0 +1,38 @@
+import h from '@satorijs/element'
+import { resolve } from 'node:path'
+import { pathToFileURL } from 'node:url'
+import { Messager } from '../../../../src/api/message/create/messager'
+import {
+  commonSend,
+  commonSendForward,
+  ctx,
+  satoriConfig,
+  saveResult,
+} from '../../../mocks'
+
+test('Red 编码器应当正确编码 图片消息', async () => {
+  const save = jest.fn().mockReturnValueOnce(saveResult)
+
+  await new Messager(
+    ctx,
+    satoriConfig,
+    {
+      send: commonSend,
+      save,
+      sendForward: commonSendForward,
+    },
+    '9998',
+  ).send(
+    h.parse(
+      `xxx<img src="${pathToFileURL(
+        resolve(__dirname, '../../../../docs/static/chronocat.png'),
+      ).toString()}" />yyy`,
+    ),
+  )
+
+  const sendCalls = commonSend.mock.calls.map((x) => x.slice(1))
+  const saveCalls = save.mock.calls.map((x) => (x as unknown[]).slice(1))
+
+  expect(sendCalls).toMatchSnapshot()
+  expect(saveCalls).toMatchSnapshot()
+})
diff --git a/packages/engine-chronocat-api/tests/messager/fixtures/text/__snapshots__/index.test.ts.snap b/packages/engine-chronocat-api/tests/messager/fixtures/text/__snapshots__/index.test.ts.snap
new file mode 100644
index 0000000..8b5ef2f
--- /dev/null
+++ b/packages/engine-chronocat-api/tests/messager/fixtures/text/__snapshots__/index.test.ts.snap
@@ -0,0 +1,26 @@
+// Jest Snapshot v1, https://goo.gl/fbAQLP
+
+exports[`Red 编码器应当正确编码 纯文本消息 1`] = `
+[
+  [
+    {
+      "chatType": 2,
+      "guildId": "",
+      "peerUid": "9998",
+    },
+    [
+      {
+        "elementId": "",
+        "elementType": 1,
+        "textElement": {
+          "atNtUid": "",
+          "atTinyId": "",
+          "atType": 0,
+          "atUid": "",
+          "content": "xxx",
+        },
+      },
+    ],
+  ],
+]
+`;
diff --git a/packages/engine-chronocat-api/tests/messager/fixtures/text/index.test.ts b/packages/engine-chronocat-api/tests/messager/fixtures/text/index.test.ts
new file mode 100644
index 0000000..705e6a9
--- /dev/null
+++ b/packages/engine-chronocat-api/tests/messager/fixtures/text/index.test.ts
@@ -0,0 +1,26 @@
+import h from '@satorijs/element'
+import { Messager } from '../../../../src/api/message/create/messager'
+import {
+  commonSave,
+  commonSend,
+  commonSendForward,
+  ctx,
+  satoriConfig,
+} from '../../../mocks'
+
+test('Red 编码器应当正确编码 纯文本消息', async () => {
+  await new Messager(
+    ctx,
+    satoriConfig,
+    {
+      send: commonSend,
+      save: commonSave,
+      sendForward: commonSendForward,
+    },
+    '9998',
+  ).send(h.parse('xxx'))
+
+  const sendCalls = commonSend.mock.calls.map((x) => x.slice(1))
+
+  expect(sendCalls).toMatchSnapshot()
+})
diff --git a/packages/engine-chronocat-api/tests/mocks/index.ts b/packages/engine-chronocat-api/tests/mocks/index.ts
new file mode 100644
index 0000000..b73a153
--- /dev/null
+++ b/packages/engine-chronocat-api/tests/mocks/index.ts
@@ -0,0 +1,58 @@
+import type { RedMessage } from '@chronocat/red'
+import type { ChronocatContext } from '@chronocat/shell'
+import h from '@satorijs/element'
+
+export const ctx: ChronocatContext = {
+  chronocat: {
+    api: {
+      'chronocat.internal.red.message.parse': (() => {
+        const fn = (async () =>
+          undefined) as unknown as ChronocatContext['chronocat']['api']['chronocat.internal.red.message.parse']
+
+        fn.notimpl = false
+        fn.engine = 'engine-mock'
+        fn.priority = 0
+
+        return fn
+      })(),
+    } as ChronocatContext['chronocat']['api'],
+    l: {
+      info: jest.fn(),
+      warn: jest.fn(),
+      error: jest.fn(),
+      debug: jest.fn(),
+    } as unknown as ChronocatContext['chronocat']['l'],
+    h,
+  } as ChronocatContext['chronocat'],
+}
+
+export const satoriConfig = {
+  type: 'satori',
+  listen: '0.0.0.0',
+  port: 5500,
+  self_url: 'https://chronocat.vercel.app',
+  token: 'DEFINE_CHRONO_TOKEN',
+  enable: true,
+} as const
+
+export const saveResult = {
+  filePath: '',
+  fileSize: 0,
+  fileName: '',
+  fileMime: '',
+  md5: '',
+  imageInfo: {
+    width: 0,
+    height: 0,
+    type: 'png',
+    mime: 'image/png',
+    wUnits: '1',
+    hUnits: '1',
+  },
+}
+
+export const commonSend = jest.fn(
+  async () => undefined as unknown as RedMessage,
+)
+export const commonSave = jest.fn(async () => saveResult)
+export const commonSendForward = jest.fn(async () => {})
diff --git a/packages/engine-chronocat-api/tests/tsconfig.json b/packages/engine-chronocat-api/tests/tsconfig.json
new file mode 100644
index 0000000..dd8328f
--- /dev/null
+++ b/packages/engine-chronocat-api/tests/tsconfig.json
@@ -0,0 +1,10 @@
+{
+  "extends": "../../../tsconfig.base",
+  "compilerOptions": {
+    "rootDir": ".."
+  },
+  "include": [
+    ".",
+    "../src"
+  ]
+}