How To Use Mocks With Sinon

How to Use Mocks with Sinon – onlinecode

In this post, we will give you information about How to Use Mocks with Sinon – onlinecode. Here we will give you detail about How to Use Mocks with Sinon – onlinecode And how to use it also give you a demo for it if it is necessary.

Mocks allow you to create a fake function that passes or fails depending on your needs.
You can ensure it was called with certain arguments, or check how many times it was called.
You must call mock() on an object.
To complete the test, you must call the verify() function to check that all the mock’s expectations were met.

const sinon = require('sinon');
const obj = {
  method: function() {
    console.log('Hello World')
  }
};
const mock = sinon.mock(obj);
mock.expects('method').once();

// 'Hello World' will not print since 'method' is stubbed out
obj.method();

// Succeeds
mock.verify();

using verify()

The verify() function will throw an error if the expectations are not met, or return true otherwise.
You must define the expectations before calling verify().

const sinon = require('sinon');
const obj = {
  method: function() {
    console.log('Hello World');
  }
};
const mock = sinon.mock(obj);
mock.expects('method').once();
obj.method();
mock.verify(); // true

using mock.restore()

The restore() function returns the mocked functions back to their original state, meaning that they will now execute whatever lines of code you had written.

const sinon = require('sinon');
const obj = {
  method: function() {
    console.log('Hello World');
  }
};
const mock = sinon.mock(obj);
mock.expects('method').once();
obj.method();
mock.verify(); // true

mock.restore();
obj.method(); // Hello World

Sinon is a JavaScript library that provides test spies, stubs, and mocks. It’s very flexible and easy to use since you can combine it with any testing framework.

Test spies: Test spies are used to record the behavior of a function. This can be useful for testing side effects, such as logging or making network requests.
Test stubs: Test stubs are used to replace a function with a fake implementation. This can be useful for testing code that relies on external dependencies, such as databases or APIs.
Test mocks: Test mocks are used to create objects that behave like real objects, but that can be controlled by the test. This can be useful for testing code that relies on specific data or behavior.

Sinon is a powerful tool that can be used to improve the quality of your JavaScript code. It’s easy to learn and use, and it’s compatible with most popular testing frameworks.

Here are some examples of how Sinon can be used:

Testing side effects: You can use a test spy to record the behavior of a function that logs to the console. This can be useful for making sure that the function is only logging when it’s supposed to.
Testing code that relies on external dependencies: You can use a test stub to replace a database with a fake implementation. This can be useful for testing code that relies on a database without having to actually connect to a database.
Testing code that relies on specific data or behavior: You can use a test mock to create an object that behaves like a real object, but that can be controlled by the test. This can be useful for testing code that relies on specific data or behavior without having to actually provide the data or behavior.

If you’re looking for a way to improve the quality of your JavaScript code, I recommend using Sinon. It’s a powerful tool that can make your code more reliable and easier to test.

Here are some resources that you can use to learn more about Sinon:

Sinon website: The Sinon website has a lot of documentation and examples.
Sinon blog: The Sinon blog has articles and tutorials about using Sinon.
Sinon forum: The Sinon forum is a great place to ask questions and get help from other Sinon users.

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