includesonly.rb

require 'rubygems'
require 'rspec'

def includes arg1, arg2
  arg1 = arg1.split if arg1.is_a? String
  arg2 = arg2.split if arg2.is_a? String
  not (arg1 & arg2).empty?
end

def includes_only arg1, arg2
  arg1 = arg1.split if arg1.is_a? String
  arg2 = arg2.split if arg2.is_a? String
  (arg1 - arg2).empty?
end

describe "#includes" do
  it "should be true for equal lists" do
    includes( ['SVO'], ['SVO'] ).should == true
  end

  specify { includes( ['SVO', 'CDG'], ['DME', 'SVO'] ).should == true }
  specify { includes( ['SVO', 'CDG'], ['DME'] ).should == false }
  specify { includes( 'SVO', 'SVO' ).should == true }
  specify { includes( 'SVO CDG', 'SVO' ).should == true }
  specify { includes( 'SVO CDG', 'DME SVO' ).should == true }
end

describe "#includes_only" do
  it "should be true for equal lists" do
    includes_only( ['SVO'], ['SVO'] ).should == true
  end

  it "should be true when first set is a subset of second set" do
    includes_only( ['SVO'], ['SVO', 'DME'] ).should == true
  end

  it "should be false when second set is only a partial subset of first set" do
    includes_only( ['SVO', 'DME'], ['SVO'] ).should == false
  end

  specify { includes_only( ['SVO', 'CDG'], ['DME', 'SVO'] ).should == false }
  specify { includes_only( ['SVO', 'CDG', 'SVO'], ['CDG', 'SVO'] ).should == true }
  specify { includes_only( ['SVO', 'CDG'], ['DME'] ).should == false }
  specify { includes_only( 'SVO', 'SVO' ).should == true }
  specify { includes_only( 'SVO CDG SVO', 'SVO CDG' ).should == true }
end