function test_active()
 {
     $coupon = new WPSC_Coupon(self::ACTIVE_COUPON_ID);
     $this->assertTrue($coupon->is_active());
     $coupon->deactivate();
     $this->assertFalse($coupon->is_active());
     $coupon->activate();
     $this->assertTrue($coupon->is_active());
 }