# encoding: utf-8

require 'spec_helper'

describe RuboCop::Cop::Style::EmptyLiteral do
  subject(:cop) { described_class.new }

  describe 'Empty Array' do
    it 'registers an offense for Array.new()' do
      inspect_source(cop,
                     ['test = Array.new()'])
      expect(cop.offenses.size).to eq(1)
      expect(cop.messages)
        .to eq(['Use array literal [] instead of Array.new.'])
    end

    it 'registers an offense for Array.new' do
      inspect_source(cop,
                     ['test = Array.new'])
      expect(cop.offenses.size).to eq(1)
      expect(cop.messages)
        .to eq(['Use array literal [] instead of Array.new.'])
    end

    it 'does not register an offense for Array.new(3)' do
      inspect_source(cop,
                     ['test = Array.new(3)'])
      expect(cop.offenses).to be_empty
    end

    it 'auto-corrects Array.new to []' do
      new_source = autocorrect_source(cop, 'test = Array.new')
      expect(new_source).to eq('test = []')
    end
  end

  describe 'Empty Hash' do
    it 'registers an offense for Hash.new()' do
      inspect_source(cop,
                     ['test = Hash.new()'])
      expect(cop.offenses.size).to eq(1)
      expect(cop.messages)
        .to eq(['Use hash literal {} instead of Hash.new.'])
    end

    it 'registers an offense for Hash.new' do
      inspect_source(cop,
                     ['test = Hash.new'])
      expect(cop.offenses.size).to eq(1)
      expect(cop.messages)
        .to eq(['Use hash literal {} instead of Hash.new.'])
    end

    it 'does not register an offense for Hash.new(3)' do
      inspect_source(cop,
                     ['test = Hash.new(3)'])
      expect(cop.offenses).to be_empty
    end

    it 'does not register an offense for Hash.new { block }' do
      inspect_source(cop,
                     ['test = Hash.new { block }'])
      expect(cop.offenses).to be_empty
    end

    it 'auto-corrects Hash.new to {}' do
      new_source = autocorrect_source(cop, 'test = Hash.new')
      expect(new_source).to eq('test = {}')
    end
  end

  describe 'Empty String' do
    it 'registers an offense for String.new()' do
      inspect_source(cop,
                     ['test = String.new()'])
      expect(cop.offenses.size).to eq(1)
      expect(cop.messages)
        .to eq(["Use string literal '' instead of String.new."])
    end

    it 'registers an offense for String.new' do
      inspect_source(cop,
                     ['test = String.new'])
      expect(cop.offenses.size).to eq(1)
      expect(cop.messages)
        .to eq(["Use string literal '' instead of String.new."])
    end

    it 'does not register an offense for String.new("top")' do
      inspect_source(cop,
                     ['test = String.new("top")'])
      expect(cop.offenses).to be_empty
    end

    it 'auto-corrects String.new to empty string literal' do
      new_source = autocorrect_source(cop, 'test = String.new')
      expect(new_source).to eq("test = ''")
    end
  end
end