How to verify if WebElement is selected or not

I want to verify if WebElement is selected or not. This element exist (when is selected) in HTML as:

<span id="user-settings-price-preview-checkbox" class="user-settings-selector-checkbox active"></span>

and when is not selected:

<span id="user-settings-price-preview-checkbox" class="user-settings-selector-checkbox"></span>

How can I verify it using selenium and TestNG?

Thx