new changes readme and gitignore

Author: sangtrandev00

.gitignore

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+node_modules

README.md

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+
+## Basic sample source for unit testing JEST WITH TYPESCRIPT

jest.config.js

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+/** @type {import('ts-jest').JestConfigWithTsJest} */
+module.exports = {
+  preset: 'ts-jest',
+  testEnvironment: 'node',
+};

package.json

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+{
+  "name": "unit-test-ts",
+  "version": "1.0.0",
+  "main": "index.js",
+  "license": "MIT",
+  "scripts": {
+    "test": "jest"
+  },
+  "devDependencies": {
+    "@types/jest": "^29.5.12",
+    "jest": "^29.7.0",
+    "ts-jest": "^29.1.2",
+    "typescript": "^5.3.3"
+  }
+}

sum.test.ts

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+import sum from './sum';
+test('adds 1 + 2 to equal 3', () => {
+  expect(sum(1, 2)).toBe(3);
+});

sum.ts

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+function sum(a, b) {
+    return a + b;
+  }
+
+export default sum;