test.rb

require 'rails_helper'

LOG_NAME = 'spec'
LOG_FILE = "#{Rails.root}/log/spec.log"

describe 'DashboardLogger' do
  let(:logger) { DashboardLogger.new LOG_NAME }

  before(:each) {
    begin
      File.delete LOG_FILE
    rescue #ignore
    end
  }

  it 'should be able to create a log if not exists' do
    logger.log 'something'
    expect(File).to exist(LOG_FILE)
  end

  it 'should log the level correctly' do
    logger.log 'info'
    expect(open(LOG_FILE, 'r').readlines[0]).to include('0;')

    logger.warn 'warn'
    expect(open(LOG_FILE, 'r').readlines[1]).to include('1;')

    logger.err 'error'
    expect(open(LOG_FILE, 'r').readlines[2]).to include('2;')
  end

  it 'should be able to log the info correctly' do
    logger.log 'the_message'
    expect(open(LOG_FILE, 'r').read).to include('the_message')
  end

  it 'should be able to append to a log that already exists' do
    open(LOG_FILE, 'w') {|f| f << 'something'}
    logger.log 'else'
    expect(open(LOG_FILE, 'r').read).to include('else')
  end

  it 'should append a log each line at a time for each write' do
    logger.log 'first'
    logger.err 'second'
    lines = open(LOG_FILE, 'r').readlines
    expect(lines[0]).to include('first')
    expect(lines[1]).to include('second')
  end
end