title: module.exports multiple functions in Jest testing
body: <p>After reading the Jest documentation, when it's mentioned that to export a single function from a tested file they show the following example:</p>
  
  <pre><code>function sum(a, b) {
    return a + b;
  }
  module.exports = sum;
  </code></pre>
  
  <p>Now, if I have multiple specific functions I want to export on my tested file, like this:</p>
  
  <pre><code>function sum(a, b) {
    return a + b;
  }
  function multiply(a, b) {
    return a * b;
  }
  function subtract(a, b) {
    return a - b;
  }
  module.exports = sum;
  module.exports = multiply;
  </code></pre>
  
  <p>The <code>multiply</code> function is the only one being exported. How can I make these function be exported? Or only part of my file?</p>