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How to fix async function in mocha before() is always finished before it() spec with JavaScript?

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Sometimes, we want to fix async function in mocha before() is always finished before it() spec with JavaScript.

In this article, we’ll look at how to fix async function in mocha before() is always finished before it() spec with JavaScript.

How to fix async function in mocha before() is always finished before it() spec with JavaScript?

To fix async function in mocha before() is always finished before it() spec with JavaScript, we can return a promise in the before callback.

For instance, we write

let a = 0;

before(() => {
  return new Promise((resolve) => {
    setTimeout(() => {
      a = 1;
      resolve();
    }, 200);
  });
});

it("a should be set to 1", () => {
  assert(a === 1);
});

to call before with a callback that returns a promise.

Then the it callback should run after the promise in the before callback is finished.

Conclusion

To fix async function in mocha before() is always finished before it() spec with JavaScript, we can return a promise in the before callback.

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