我想对一个类执行单元测试，我的目标是：我想使用函数检查插件是否被激活：is_plugin_active

class WC_Custom_Variable_Products_Dependencies {
    public function __construct() {
          add_action( \'admin_init\', [$this, \'check_environment\']);
    }
    public function check_environment(){
          return is_plugin_active( 
                    \'woocommerce-custom-variable-products/woocommerce-custom-variable-products.php\' 
                 );
    }
}

require_once \'class-wc-custom-variable-products-dependencies.php\';
class WC_Custom_Variable_Products_DependenciesTest extends WP_UnitTestCase {

    public function setUp() {
        parent::setUp();

        $this->class_instance = new WC_Custom_Variable_Products_Dependencies();
    }

    public function test_check_environment(){

        $result = $this->class_instance->check_environment();
        $this->assertTrue($result);
    }

我的插件被激活，功能is_plugin_active 如果从浏览器执行，则返回True：

add_action(\'admin_init\', function(){

     var_dump(is_plugin_active( 
                        \'woocommerce-custom-variable-products/woocommerce-custom-variable-products.php\' 
    ));
});