Equality operator in Jade

I am trying to write a mixin in Jade. I would like to pass a parameter through mixin to build same type of block with different value at different states. In the mixin I want to write a conditional that checks if passed parameter is equal to some value. But unfortunately it is not working and I can't find proper documentation anywhere. My code section is following:

mixin test(id)
    if territoryList
        each val in territoryList
            - if (val.parentArea==id){
                button.btn.btn-primary.btn-block=val.name
            - }

And I am calling it like test('1')

What is the problem?