how to check error in qunit

I have a function in JavaScript that uses the q library:

validateOnSelection : function(model) {
    this.context.service.doLofig(model).then(function(bResult) {
        if (bResult) {
            return true;
        } else {
            throw new Error(that.context.i18n.getText("i18n", "error"));
        }
    });
}

How can I check in qunit that the result is error? Let's assume that the result: bResult is false and Error should raise.

I tried:

test("Basic test ", {
    // get the oTemplate and model 

    return oTemplate.validateOnSelection(model).then(function(bResult) {
        // Now I need to check the error
    });

}));

The problem that I didn't get to the check "// Now I need to check the error"