extToken()).toBe <span class="hljs-string">'!'</span>
    expect(nextToken()).toBe <span class="hljs-string">'a'</span>
    expect(nextToken()).toBe <span class="hljs-string">'+'</span>
    expect(nextToken()).toBe <span class="hljs-string">'!'</span>
    expect(nextToken()).toBe <span class="hljs-string">'#test'</span>
    expect(nextToken()).toBe <span class="hljs-literal">null</span>

  check <span class="hljs-string">"error: exclamation mark with operation"</span>, <span class="hljs-function">-&gt