});

          test('Appends a text node', () => {
            const container = document.createDocumentFragment();
            container.appendChild(document.createElement('div'));

            container.append('This is some text.');

            assert(container.childNodes.length === 2);
            assert(container.childNodes[1].nodeType === Node.TEXT_NODE);
            assert(
              container.childNodes[1].textContent === 'This is some text.'
            );
          });

          test('Appends