Add list unit tests

src/scripts/src/components/list.js

@@ -18,10 +18,9 @@ export default class List {
   /**
    * Scroll to passed position on Y axis
    */
-  scrollTo(scrollPos) {
+  scrollTo(scrollPos = 0) {
     this.element.scrollTop = scrollPos;
   }
-
   /**
    * Append node to element
    */

src/scripts/src/components/list.test.js

@@ -14,7 +14,7 @@ describe('List', () => {
         ...DEFAULT_CONFIG,
       },
     };
-    choicesElement = document.createElement('select');
+    choicesElement = document.createElement('div');
     instance = new List(choicesInstance, choicesElement, DEFAULT_CLASSNAMES);
   });
 
@@ -29,4 +29,52 @@ describe('List', () => {
   it('assigns classnames to class', () => {
     expect(instance.classNames).to.eql(DEFAULT_CLASSNAMES);
   });
+
+  describe('clear', () => {
+    it('clears element\'s inner HTML', () => {
+      const innerHTML = 'test';
+      instance.element.innerHTML = innerHTML;
+      expect(instance.element.innerHTML).to.equal(innerHTML);
+      instance.clear();
+      expect(instance.element.innerHTML).to.equal('');
+    });
+  });
+
+  describe('scrollTo', () => {
+    it('scrolls element to passed position', () => {
+      const scrollPosition = 20;
+      expect(instance.element.scrollTop).to.equal(0);
+      instance.scrollTo(scrollPosition);
+      expect(instance.element.scrollTop).to.equal(scrollPosition);
+    });
+  });
+
+  describe('append', () => {
+    it('appends passed node to element', () => {
+      const elementToAppend = document.createElement('span');
+      const childClass = 'test-element';
+      elementToAppend.classList.add(childClass);
+      expect(instance.element.querySelector(`.${childClass}`)).to.equal(null);
+      instance.append(elementToAppend);
+      expect(instance.element.querySelector(`.${childClass}`)).to.equal(elementToAppend);
+    });
+  });
+
+
+  describe('getChild', () => {
+    let childElement;
+    const childClass = 'test-element';
+
+    beforeEach(() => {
+      childElement = document.createElement('span');
+      childElement.classList.add(childClass);
+      instance.element.appendChild(childElement);
+    });
+
+    it('returns child element', () => {
+      const expectedResponse = childElement;
+      const actualResponse = instance.getChild(`.${childClass}`);
+      expect(expectedResponse).to.eql(actualResponse);
+    });
+  });
 });