inspec/test/unit/resources/aws_cloudwatch_alarm_test.rb

require "helper"
require "inspec/resource"
require "resources/aws/aws_cloudwatch_alarm"

require "resource_support/aws"
require "resources/aws/aws_cloudwatch_alarm"

# MCWAB = MockCloudwatchAlarmBackend
# Abbreviation not used outside this file

#=============================================================================#
#                            Constructor Tests
#=============================================================================#
class AwsCWAConstructor < Minitest::Test
  def setup
    AwsCloudwatchAlarm::BackendFactory.select(AwsMCWAB::Empty)
  end

  def test_constructor_some_args_required
    assert_raises(ArgumentError) { AwsCloudwatchAlarm.new }
  end

  def test_constructor_accepts_known_resource_params_combos
    [
      { metric_name: "some-val", metric_namespace: "some-val" },
    ].each do |combo|
      AwsCloudwatchAlarm.new(combo)
    end
  end

  def test_constructor_rejects_bad_resource_params_combos
    [
      { metric_name: "some-val" },
      { metric_namespace: "some-val" },
    ].each do |combo|
      assert_raises(ArgumentError) { AwsCloudwatchAlarm.new(combo) }
    end
  end

  def test_constructor_reject_unknown_resource_params
    assert_raises(ArgumentError) { AwsCloudwatchAlarm.new(beep: "boop") }
  end
end

#=============================================================================#
#                               Search / Recall
#=============================================================================#

class AwsCWARecall < Minitest::Test
  def setup
    AwsCloudwatchAlarm::BackendFactory.select(AwsMCWAB::Basic)
  end

  def test_recall_no_match_is_no_exception
    alarm = AwsCloudwatchAlarm.new(metric_name: "nope", metric_namespace: "nope")
    refute alarm.exists?
  end

  def test_recall_match_single_result_works
    alarm = AwsCloudwatchAlarm.new(
      metric_name: "metric-01",
      metric_namespace: "metric-namespace-01"
    )
    assert alarm.exists?
  end

  def test_recall_multiple_result_raises
    assert_raises(RuntimeError) do
      AwsCloudwatchAlarm.new(
        metric_name: "metric-02",
        metric_namespace: "metric-namespace-01"
      )
    end
  end
end

#=============================================================================#
#                                Properties
#=============================================================================#

class AwsCWAProperties < Minitest::Test
  def setup
    AwsCloudwatchAlarm::BackendFactory.select(AwsMCWAB::Basic)
  end

  #---------------------------------------
  #       alarm_actions
  #---------------------------------------
  def test_prop_actions_empty
    alarm = AwsCloudwatchAlarm.new(
      metric_name: "metric-02",
      metric_namespace: "metric-namespace-02"
    )
    assert_kind_of Array, alarm.alarm_actions
    assert_empty alarm.alarm_actions
  end

  def test_prop_actions_hit
    alarm = AwsCloudwatchAlarm.new(
      metric_name: "metric-01",
      metric_namespace: "metric-namespace-01"
    )
    assert_kind_of Array, alarm.alarm_actions
    refute_empty alarm.alarm_actions
    assert_kind_of String, alarm.alarm_actions.first
  end
end

#=============================================================================#
#                               Test Fixtures
#=============================================================================#

module AwsMCWAB
  class Empty < AwsBackendBase
    def describe_alarms_for_metric(_criteria)
      OpenStruct.new({
        metric_alarms: [],
      })
    end
  end

  class Basic < AwsBackendBase
    def describe_alarms_for_metric(criteria)
      OpenStruct.new({
        metric_alarms: [ # rubocop:disable Metrics/BlockLength
          # Each one here is an alarm that is subscribed to the given metric
          # Each has an enormous number of properties, most omitted here
          # http://docs.aws.amazon.com/sdkforruby/api/Aws/CloudWatch/Client.html#describe_alarms_for_metric-instance_method
          OpenStruct.new({
            alarm_name: "alarm-01",
            metric_name: "metric-01",
            namespace: "metric-namespace-01",
            statistic: "SampleCount",
            alarm_actions: [
              "arn::::" # TODO: get SNS ARN format
            ],
          }),
          OpenStruct.new({
            # Alarm 02 and 03 both watch metric-01, metric-namespace-01
            alarm_name: "alarm-02",
            metric_name: "metric-02",
            namespace: "metric-namespace-01",
            statistic: "SampleCount",
            alarm_actions: [],
          }),
          OpenStruct.new({
            # Alarm 02 and 03 both watch metric-02, metric-namespace-01
            alarm_name: "alarm-03",
            metric_name: "metric-02",
            namespace: "metric-namespace-01",
            statistic: "SampleCount",
            alarm_actions: [],
          }),
          OpenStruct.new({
            alarm_name: "alarm-04",
            metric_name: "metric-02",
            namespace: "metric-namespace-02",
            statistic: "SampleCount",
            alarm_actions: [],
          }),
        ].select do |alarm|
          criteria.keys.all? do |criterion|
            criterion = "namespace" if criterion == "metric_namespace"
            alarm[criterion] == criteria[criterion]
          end
        end,
      })
    end
  end
end