Mocha.js: before, beforeEach, after, afterEach

You can use before these to setup and restore any test helpers or components. You can even call these agains in nested describe.

describe('My feature test', function() {
    let classToTest;
    beforeEach(function() {
        classToTest = new ClassToTest();
    });
    
    afterEach(function() {
        classToTest = null;
    });
});

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