jest-tutorial/sum.js at master · chirag-soni23/jest-tutorial · GitHub

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1. // Basic concept jest
function sum(a,b){
    return a + b;

}
module.exports = sum;

2. // toThrow()
function myFunction(input){
    if(typeof input != 'number'){
        throw new Error('Invalid Input')
    }
}
module.exports = myFunction;

3. // Asynchronus Code
function fetchData(callback){
    setTimeout(()=>{
        callback("Peanut butter")
    },1000)
}
module.exports = fetchData


4. // Promise Asynchronous Code
function fetchPromise(){
    return new Promise((resolve,reject)=>
        setTimeout(()=>{
            resolve("peanut butter")
        },1000)
    )
}
module.exports = fetchPromise

5.// Async Await Asynchronous code
function fetchAsync() {
    return new Promise((resolve, reject) =>
        setTimeout(() => {
            resolve("peanut Jam");
        }, 1000)
    );
}

module.exports = fetchAsync;