如何使用TypeScript和Jest模拟深度嵌套函数

npm init -y

npm install --save-dev typescript jest ts-jest @types/jest

{
  "compilerOptions": {
    "target": "es5",
    "module": "commonjs",
    "esModuleInterop": true
  }
}

module.exports = {
  preset: 'ts-jest',
  testEnvironment: 'node',
};

function add(a: number, b: number): number {
  return a + b;
}

function multiply(a: number, b: number): number {
  return a * b;
}

function deepNestedFunction(a: number, b: number): number {
  const sum = add(a, b);
  const product = multiply(a, b);
  return add(sum, product);
}

export default deepNestedFunction;

npx tsc

import deepNestedFunction from './nestedFunctions';

test('deepNestedFunction should return the correct result', () => {
  const result = deepNestedFunction(2, 3);
  expect(result).toBe(11);
});

npx jest