ruby--ruby/spec/ruby/core/hash/lt_spec.rb

require_relative '../../spec_helper'
require_relative 'shared/comparison'
require_relative 'shared/less_than'

describe "Hash#<" do
  it_behaves_like :hash_comparison, :<
  it_behaves_like :hash_less_than, :<

  it "returns false if both hashes are identical" do
    h = { a: 1, b: 2 }
    (h < h).should be_false
  end
end

describe "Hash#<" do
  before :each do
    @hash = {a:1, b:2}
    @bigger = {a:1, b:2, c:3}
    @unrelated = {c:3, d:4}
    @similar = {a:2, b:3}
  end

  it "returns false when receiver size is larger than argument" do
    (@bigger < @hash).should == false
    (@bigger < @unrelated).should == false
  end

  it "returns false when receiver size is the same as argument" do
    (@hash < @hash).should == false
    (@hash < @unrelated).should == false
    (@unrelated < @hash).should == false
  end

  it "returns true when receiver is a subset of argument" do
    (@hash < @bigger).should == true
  end

  it "returns false when keys match but values don't" do
    (@hash < @similar).should == false
    (@similar < @hash).should == false
  end
end