Tests for challenge 11 of the FMI ruby course

to_proc_spec.rb

require 'spec_helper'

ivan   = Student.new 'Иван', 10, :second
mariya = Student.new 'Мария', 12, :first
neycho = Student.new 'Нейчо', 9, :third

students = [ivan, mariya, neycho]

describe "Array#to_proc" do
  it "works for a single element" do
    [:abs].to_proc.call(-42).should eq [42]
  end

  it 'should work for arrays with multiple elements' do |variable|
    [:points, :name].to_proc.call(ivan) # => [10, 'Иван']
  end

  it "should work with ampersand" do
    expect(students.map(&[:name, :rank])).to eq [['Иван', :second],
                                                 ['Мария', :first],
                                                 ['Нейчо', :third]]
  end
end

describe "Hash#to_proc" do
  let(:student) { Class.new { attr_accessor :points, :rank }.new }

  it "sets the properties of the object which correspond to its key value pairs" do
    {points: 0}.to_proc.call(student)
    student.points.should eq 0
  end

  it "should work with ampersand" do
    students.each &{points: 0, rank: :last}
    expect(students.map(&:points)).to eq [0, 0, 0]
    expect(students.map(&:rank)).to eq [:last, :last, :last]
  end
end

Тук е добра идея да си inline-неш този Student клас. Или дори да го направиш анонимен такъв.