iRule syntax error

You're syntax is slightly off, try this

when HTTP_REQUEST {
    switch [HTTP::uri] {
        "/info/capacity" {
            if {[active_members pool_test1 ] >0 } {
                pool pool_test1 
            } else {
                pool pool_sorry
            }
        }
        "/execution/v1" {
            if {[active_members pool_test2 ] >0 } {
                pool pool_test2
            } else {
                pool pool_sorry2
            } 
        }
    }
}