setupTests.js


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import '@testing-library/jest-dom';

window.matchMedia = window.matchMedia || function() {
    return {
        matches: true,
        media: '',
        addListener: function() { return true; },
        removeListener: function() { return true; },
        addEventListener: function() { return true; },
        removeEventListener: function() { return true; },
        dispatchEvent: function() { return true; },
        onchange: function() { return true; }
    };
};