jQuery for loop for checkbox selection

I have three checkboxes which might be checked based on the requirement of the user. And I want them to select anyone without any, in particular, being required. But I want them to select at least one amongst the and want to achieve the same with jQuery, I have already done the validation on the backend but if someone can help me a way where jQuery can achieve the same with a for loop it would be great. Fiddle for the same

Below are the three checkboxes

HTML:

<div class="form-group">
    <div class="cols-sm-10">
        <p>Select tests </p>
        <label class="col-md-12" id="select-type">
          <div class="col-md-2" id="select-type">
            <input value="Test A" type="checkbox" name="app1" ><span class="radio-size"><span class="demo-select">&times;</span></span>
          </div>
        </label>
        <label class="col-md-12" id="select-type">
          <div class="col-md-2" id="select-type">
            <input value="Test B" type="checkbox" name="app1" ><span class="radio-size"><span class="demo-select">&times;</span></span>
          </div>
        </label>
        <label class="col-md-12" id="select-type">
          <div class="col-md-2" id="select-type">
            <input value="Test C" type="checkbox" name="app1" ><span class="radio-size"><span class="demo-select">&times;</span></span>
          </div>
        </label>
    </div>
</div>