Added tests

jest.config.js

@@ -26,6 +26,8 @@ module.exports = {
   moduleNameMapper: {
     '^@packages/jq/(.*)$': '<rootDir>packages/jq/$1',
     '^@packages/tokenizer/(.*)$': '<rootDir>packages/tokenizer/$1',
+    '^@packages/jq$': '<rootDir>packages/jq',
+    '^@packages/tokenizer$': '<rootDir>packages/tokenizer',
     '^@core/(.*)$': '<rootDir>src/core/$1',
     '^@testing/(.*)$': '<rootDir>testing/$1',
     '^@testing$': '<rootDir>testing',

src/background/handler.test.ts

@@ -0,0 +1,61 @@
+const formatMock = jest.fn();
+const tokenizeMock = jest.fn();
+const jqMock = jest.fn();
+
+jest.mock('@packages/jq', () => ({ jq: jqMock }));
+jest.mock('@packages/tokenizer', () => ({
+  format: formatMock,
+  tokenize: tokenizeMock,
+}));
+
+import { type Message } from '@core/background';
+import { describe, test } from '@jest/globals';
+import { handler } from './handler';
+
+describe('handler', () => {
+  test('should handle tokenize message', async () => {
+    const message: Message = { json: 'json', action: 'tokenize' };
+    tokenizeMock.mockResolvedValue('tokenized');
+
+    const sendResponse = jest.fn();
+
+    await handler(message, sendResponse);
+
+    expect(tokenizeMock).toHaveBeenCalledWith(message.json);
+    expect(sendResponse).toHaveBeenCalledWith('tokenized');
+  });
+
+  test('should handle format message', async () => {
+    const message: Message = { json: 'json', action: 'format' };
+    formatMock.mockResolvedValue('formatted');
+
+    const sendResponse = jest.fn();
+
+    await handler(message, sendResponse);
+
+    expect(formatMock).toHaveBeenCalledWith(message.json);
+    expect(sendResponse).toHaveBeenCalledWith('formatted');
+  });
+
+  test('should handle jq message', async () => {
+    const message: Message = { json: 'json', query: '.query', action: 'jq' };
+    jqMock.mockResolvedValue('jq');
+
+    const sendResponse = jest.fn();
+
+    await handler(message, sendResponse);
+
+    expect(jqMock).toHaveBeenCalledWith(message.json, message.query);
+    expect(sendResponse).toHaveBeenCalledWith('jq');
+  });
+
+  test('should do nothing if message is not recognized', async () => {
+    const message = { json: 'json', action: 'unknown' } as unknown as Message;
+
+    const sendResponse = jest.fn();
+
+    await handler(message, sendResponse);
+
+    expect(sendResponse).not.toHaveBeenCalled();
+  });
+});