Items counter test

src/__tests__/itemsCounter.test.js

@@ -0,0 +1,31 @@
+import UserInterface from '../modules/userInterface.js';
+
+describe('Counting number of items', () => {
+  beforeEach(() => {
+    document.body.innerHTML = `
+              <div>
+                  <ul class="recipes__list">
+                  </ul>
+              </div>`;
+  });
+  it('Returns 0 if there are no items present in the List', () => {
+    expect(UserInterface.itemCount()).toBe(0);
+  });
+
+  it('Returns 1 when an item get added to the list.', () => {
+    const LIST = document.querySelector('.recipes__list');
+    const LI = document.createElement('li');
+    LIST.appendChild(LI);
+    expect(UserInterface.itemCount()).toBe(1);
+  });
+
+  it('Returns n when n items get added to the list', () => {
+    const LIST = document.querySelector('.recipes__list');
+    const n = 8;
+    for (let i = 0; i < n; i += 1) {
+      const LI = document.createElement('li');
+      LIST.appendChild(LI);
+    }
+    expect(UserInterface.itemCount()).toBe(n);
+  });
+});