require 'rspec'
require_relative 'implementations.rb'

RSpec.describe Implementations do
  subject { described_class.new([1, 2, 3]) }

  describe '#valid?' do
    context 'when array is not empty' do
      it 'array valid' do
        expect(subject.valid?).to eq true
      end
    end

    context 'when array empty' do
      subject { described_class.new([]) }
      it 'array nill' do
        expect(subject.valid?).to eq false
      end
    end
  end

  describe '#if_block_given?' do
    context 'when block is given' do
      it 'block given' do
        expect(subject.if_block_given?).to eq true
      end
    end

    context 'when block is not given' do
      it 'block is not given' do
        expect(subject.if_block_given?).to eq false
      end
    end
  end

  describe '#my_map' do
    context 'when array valid' do
      it 'should return right array' do
        expect(subject.my_map { |element| element + 1}).to eq [2, 3, 4]
      end
    end
  end

  describe '#my_select' do
    context 'when array valid' do
      it 'should return right array' do
        expect(subject.my_select { |element| element > 2}).to eq [3]
      end
    end
  end

  describe '#my_each' do
    context 'when strings valid' do
      it 'should return right string' do
        expectation = expect do (subject.my_each { |element| puts element * 2 }) end
        expectation.to output("2\n4\n6\n").to_stdout
      end
    end
  end
end