ruby--ruby/test/logger/test_formatter.rb

# coding: US-ASCII
# frozen_string_literal: false
require 'logger'

class TestFormatter < Test::Unit::TestCase
  def test_call
    severity = 'INFO'
    time = Time.now
    progname = 'ruby'
    msg = 'This is a test'
    formatter = Logger::Formatter.new

    result = formatter.call(severity, time, progname, msg)
    time_matcher = /\d{4}\-\d{2}\-\d{2}T\d{2}:\d{2}:\d{2}\.\d{6}/
    matcher = /#{severity[0..0]}, \[#{time_matcher} #\d+\]  #{severity} -- #{progname}: #{msg}\n/

    assert_match(matcher, result)
  end

  class CustomFormatter < Logger::Formatter
    def call(time)
      format_datetime(time)
    end
  end

  def test_format_datetime
    time = Time.now
    formatter = CustomFormatter.new

    result = formatter.call(time)
    matcher = /^\d{4}\-\d{2}\-\d{2}T\d{2}:\d{2}:\d{2}\.\d{6}$/

    assert_match(matcher, result)
  end
end