rackstash/spec/rackstash_spec.rb

# frozen_string_literal: true
#
# Copyright 2017 Holger Just
#
# This software may be modified and distributed under the terms
# of the MIT license. See the LICENSE.txt file for details.

require 'spec_helper'

describe Rackstash do
  describe Rackstash::NotImplementedHereError do
    it 'inherits from ScriptError' do
      expect(described_class.superclass).to equal ScriptError
    end
  end

  it 'defines PROGRAME with the correct version' do
    expect(Rackstash::PROGNAME).to match %r{\Arackstash/v\d+(\..+)*\z}
    expect(Rackstash::PROGNAME).to be_frozen
  end

  it 'defines SEVERITIES constants' do
    expect(Rackstash::SEVERITIES).to eql((0..5).to_a)

    expect(Rackstash::DEBUG).to eql 0
    expect(Rackstash::INFO).to eql 1
    expect(Rackstash::WARN).to eql 2
    expect(Rackstash::ERROR).to eql 3
    expect(Rackstash::FATAL).to eql 4
    expect(Rackstash::UNKNOWN).to eql 5
  end

  it 'defines EMPTY_* constants' do
    expect(Rackstash::EMPTY_STRING).to eql ''
    expect(Rackstash::EMPTY_STRING).to be_frozen

    expect(Rackstash::EMPTY_SET).to eql Set.new
    expect(Rackstash::EMPTY_SET).to be_frozen
  end

  it 'defines ISO8601_PRECISION' do
    expect(Rackstash::ISO8601_PRECISION).to be_a Integer
  end

  it 'defines FIELD_* constants' do
    constants = Rackstash.constants.select { |c| c.to_s.start_with?('FIELD_') }

    expect(constants).not_to be_empty
    constants.each do |name|
      expect(Rackstash.const_get(name)).to be_a String
      expect(Rackstash.const_get(name)).to be_frozen
    end
  end

  describe 'UNDEFINED' do
    it 'defines the UndefinedClass' do
      expect(Rackstash::UndefinedClass).to be_a Class

      # No (further) ibjects can be created of this class
      expect { Rackstash::UndefinedClass.new }.to raise_error NoMethodError
      expect { Rackstash::UndefinedClass.allocate }.to raise_error NoMethodError
    end

    it 'defines the singleton object' do
      expect(Rackstash::UNDEFINED).to be_instance_of Rackstash::UndefinedClass
      expect(Rackstash::UNDEFINED.to_s).to eql 'undefined'

      expect(Rackstash::UNDEFINED).to equal Rackstash::UNDEFINED

      expect(Rackstash::UNDEFINED).not_to eql nil
      expect(Rackstash::UNDEFINED).not_to eql false
      expect(Rackstash::UNDEFINED).not_to eql true
      expect(Rackstash::UNDEFINED).not_to eql 42
    end
  end

  describe '.severity_label' do
    it 'returns the label for an integer severity' do
      expect(described_class.severity_label(0)).to eql 'DEBUG'
      expect(described_class.severity_label(4)).to eql 'FATAL'
      expect(described_class.severity_label(5)).to eql 'ANY'
    end

    it 'returns ANY for out-of-range severities' do
      expect(described_class.severity_label(-3)).to eql 'ANY'
      expect(described_class.severity_label(42)).to eql 'ANY'
    end

    it 'returns the label for a named severity' do
      expect(described_class.severity_label('DeBuG')).to eql 'DEBUG'
      expect(described_class.severity_label('warn')).to eql 'WARN'
      expect(described_class.severity_label(:error)).to eql 'ERROR'
      expect(described_class.severity_label('UnknoWn')).to eql 'ANY'
    end

    it 'returns ANY for unknown severity names' do
      expect(described_class.severity_label('foo')).to eql 'ANY'
      expect(described_class.severity_label(:test)).to eql 'ANY'
      expect(described_class.severity_label(nil)).to eql 'ANY'
    end
  end

  describe '.severity' do
    it 'can be set as an integer' do
      expect(Rackstash.severity(3)).to eql 3
      expect(Rackstash.severity(42)).to eql 42
      expect(Rackstash.severity(-25)).to eql(-25)
    end

    it 'can be set as a symbol' do
      %i[debug info warn error fatal unknown].each_with_index do |level, i|
        expect(Rackstash.severity(level)).to eql i
      end

      %i[DeBuG InFo WaRn ErRoR FaTaL UnKnOwN].each_with_index do |level, i|
        expect(Rackstash.severity(level)).to eql i
      end
    end

    it 'can be set as a string' do
      %w[debug info warn error fatal unknown].each_with_index do |level, i|
        expect(Rackstash.severity(level)).to eql i
      end

      %w[DeBuG InFo WaRn ErRoR FaTaL UnKnOwN].each_with_index do |level, i|
        expect(Rackstash.severity(level)).to eql i
      end
    end

    it 'rejects invalid values' do
      expect { Rackstash.severity('invalid') }.to raise_error(ArgumentError)
      expect { Rackstash.severity(Object.new) }.to raise_error(ArgumentError)
      expect { Rackstash.severity(nil) }.to raise_error(ArgumentError)
      expect { Rackstash.severity(false) }.to raise_error(ArgumentError)
      expect { Rackstash.severity(true) }.to raise_error(ArgumentError)
    end
  end

  describe '.error_flow' do
    it 'returns a default Flow' do
      expect(described_class.error_flow).to be_instance_of Rackstash::Flow

      expect(described_class.error_flow.encoder).to be_instance_of Rackstash::Encoder::JSON
      expect(described_class.error_flow.adapter).to be_instance_of Rackstash::Adapter::IO
    end

    it 'caches the flow' do
      expect(described_class.error_flow).to equal described_class.error_flow
    end
  end

  describe '.error_flow=' do
    let(:flow) {
      flow = instance_double('Rackstash::Flow')
      allow(flow).to receive(:is_a?).with(Rackstash::Flow).and_return(true)
      flow
    }

    it 'can set a new flow' do
      described_class.error_flow = flow
      expect(described_class.error_flow).to equal flow
    end

    it 'wraps a non-flow' do
      adapter = 'spec.log'
      expect(Rackstash::Flow).to receive(:new).with(adapter).and_return(flow)

      described_class.error_flow = adapter
      expect(described_class.error_flow).to equal flow
    end
  end
end