How to Stub a Function with Sinon – onlinecode
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The stub() function substitutes the passed function with a fake that returns a predetermined value.
Chain it with other Sinon functions like callsFake() and yieldsTo() to configure what value the stubbed function returns.
For example, below is how you can stub out Axios’ get() function so it always returns an HTTP 200.
const axios = require('axios');
const sinon = require('sinon');
const assert = require('assert');
const stub = sinon.stub(axios, 'get').callsFake(() => Promise.resolve({ status: 200 }));
// Calls the fake 'axios.get()'
const test = await axios.get('https://httpbin.org/get');
assert.deepEqual(test.data, { status:200 }); // passes
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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