Optimise the code and add a test for something

src/components/Background.jsx

@@ -14,7 +14,9 @@ export default class Background extends React.Component {
       const photo = Math.floor(Math.random() * (20 - 1 + 1)) + 1; // There are 20 images in the offline-images folder
       document.getElementById('backgroundCredits').style.display = 'none'; // Hide the location icon
       let photographer; // Photographer credit
-      switch (photo) { // Select photographer based on image file number
+      let pixabayNumbers = [2, 3, 9, 11, 13, 14, 15]; // As there are a lot of Pixabay photos, we shorten the code a bit here
+      if (pixabayNumbers.includes(photo)) photographer = 'Pixabay';
+      else switch (photo) {
         default: {
           photographer = 'Unknown';
           break;
@@ -23,14 +25,6 @@ export default class Background extends React.Component {
           photographer = 'Tirachard Kumtanom';
           break;
         }
-        case 2: {
-          photographer = 'Pixabay';
-          break;
-        }
-        case 3: {
-          photographer = 'Pixabay';
-          break;
-        }
         case 4: {
           photographer = 'Sohail Na';
           break;
@@ -39,30 +33,10 @@ export default class Background extends React.Component {
           photographer = 'Miriam Espacio';
           break;
         }
-        case 9: {
-          photographer = 'Pixabay';
-          break;
-        }
         case 10: {
           photographer = 'NO NAME';
           break;
         }
-        case 11: {
-          photographer = 'Pixabay';
-          break;
-        }
-        case 13: {
-          photographer = 'Pixabay';
-          break;
-        }
-        case 14: {
-          photographer = 'Pixabay';
-          break;
-        }
-        case 15: {
-          photographer = 'Pixabay';
-          break;
-        }
         case 20: {
           photographer = 'Fabian Wiktor';
           break;

src/components/Quote.jsx

@@ -15,6 +15,13 @@ export default class Quote extends React.Component {
     try { // First we try and get a quote from the API...
       let data = await fetch('https://api.muetab.xyz/getQuote');
       data = await data.json();
+      if (data.statusCode === 429) { // If we hit the ratelimit, we fallback to local quotes
+        const quote = Quotes.random(); // Get a random quote from our local package
+        return this.setState({ 
+          quote: quote.quote, 
+          author: quote.author 
+        }); // Set the quote
+      }
       this.setState({ 
         quote: data.quote, 
         author: data.author