Exploring different approaches for testing within a ReactJS component?

I recently began exploring TDD and unit testing my JavaScript code, specifically by using Mocha and React shallow renderer to test my React components. The component I am currently testing looks like this:

var React = require('react');

var test = React.createClass({

    render: function() {

        return (
            <div>My custom test component ({this.props.testAttribute})</div>
        );
    },

    testFunction: function () {
        return true;
    }

});

module.exports = test;

Now that I have successfully tested the rendering of the component using shallow rendering, I also want to write tests for the testFunction() method to ensure it behaves as expected. Could someone guide me on how to approach testing this specific function?

Answer №1

In the case of your testFunction, its testing approach may vary depending on its purpose and relation to rendering.

If the function is closely tied to rendering tasks, such as an onClickHandler, it would be best to test it in conjunction with the rendering process. Shallow rendering might not provide comprehensive results in this scenario, so using a real DOM (consider using jsDOM and/or the enzyme testing library) could offer more accurate testing capabilities.

On the other hand, if the function involves standalone calculations that are independent of rendering operations, consider abstracting it into a separate file to enhance modularity and separation of concerns. This allows you to test it like any other JavaScript code.

If you specifically aim to test the function within the component itself, utilizing a real DOM is necessary. A sample mocha/chai test can be structured as follows:

import jsdom from "jsdom";
import TestUtils from "react/lib/ReactTestUtils";

describe("Component Test", function () {

    beforeEach(function () {
        global.document = jsdom.jsdom("<!doctype html><html><body></body></html>");
        global.window = global.document.defaultView;

        this.component = TestUtils.renderIntoDocument(<MyComponent/>);
    });

    afterEach(function () {
        delete global.document;
        delete global.window;
    });


   it("test the function", function () {
        expect(this.component.testFunction()).to.be(true);
    });
});

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