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Contents
require 'spec_helper'
module Alf
module Operator::Relational
describe Rank do
let(:operator_class){ Rank }
it_should_behave_like("An operator class")
let(:input) {[
{:pid => 'P1', :weight => 12.0},
{:pid => 'P2', :weight => 17.0},
{:pid => 'P3', :weight => 17.0},
{:pid => 'P4', :weight => 14.0},
{:pid => 'P5', :weight => 12.0},
{:pid => 'P6', :weight => 19.0}
]}
subject{ operator.to_rel }
context "with partial ordering" do
let(:expected) {Alf::Relation[
{:pid => 'P1', :weight => 12.0, :rank => 0},
{:pid => 'P5', :weight => 12.0, :rank => 0},
{:pid => 'P4', :weight => 14.0, :rank => 2},
{:pid => 'P2', :weight => 17.0, :rank => 3},
{:pid => 'P3', :weight => 17.0, :rank => 3},
{:pid => 'P6', :weight => 19.0, :rank => 5}
]}
let(:operator){ Lispy.rank(input, [:weight]) }
it{ should eq(expected) }
end # partial ordering
describe "with total ordering" do
let(:expected) {Alf::Relation[
{:pid => 'P1', :weight => 12.0, :newname => 0},
{:pid => 'P5', :weight => 12.0, :newname => 1},
{:pid => 'P4', :weight => 14.0, :newname => 2},
{:pid => 'P2', :weight => 17.0, :newname => 3},
{:pid => 'P3', :weight => 17.0, :newname => 4},
{:pid => 'P6', :weight => 19.0, :newname => 5}
]}
let(:operator){ Lispy.rank(input, [:weight, :pid], :newname) }
it{ should eq(expected) }
end # total ordering
end
end
end
Version data entries
5 entries across 5 versions & 1 rubygems