auto-scaling-group.test.ts

import { Annotations, Match, Template } from '@aws-cdk/assertions';
import * as cloudwatch from '@aws-cdk/aws-cloudwatch';
import * as ec2 from '@aws-cdk/aws-ec2';
import { AmazonLinuxCpuType, AmazonLinuxGeneration, AmazonLinuxImage, InstanceType, LaunchTemplate } from '@aws-cdk/aws-ec2';
import * as iam from '@aws-cdk/aws-iam';
import * as sns from '@aws-cdk/aws-sns';
import { testDeprecated } from '@aws-cdk/cdk-build-tools';
import * as cdk from '@aws-cdk/core';
import * as autoscaling from '../lib';
import { OnDemandAllocationStrategy, SpotAllocationStrategy } from '../lib';

/* eslint-disable quote-props */

describe('auto scaling group', () => {
  test('default fleet', () => {
    const stack = getTestStack();
    const vpc = mockVpc(stack);

    new autoscaling.AutoScalingGroup(stack, 'MyFleet', {
      instanceType: ec2.InstanceType.of(ec2.InstanceClass.M4, ec2.InstanceSize.MICRO),
      machineImage: new ec2.AmazonLinuxImage(),
      vpc,
    });

    Template.fromStack(stack).templateMatches({
      'Parameters': {
        'SsmParameterValueawsserviceamiamazonlinuxlatestamznamihvmx8664gp2C96584B6F00A464EAD1953AFF4B05118Parameter': {
          'Type': 'AWS::SSM::Parameter::Value<AWS::EC2::Image::Id>',
          'Default': '/aws/service/ami-amazon-linux-latest/amzn-ami-hvm-x86_64-gp2',
        },
      },
      'Resources': {
        'MyFleetInstanceSecurityGroup774E8234': {
          'Type': 'AWS::EC2::SecurityGroup',
          'Properties': {
            'GroupDescription': 'TestStack/MyFleet/InstanceSecurityGroup',
            'SecurityGroupEgress': [
              {
                'CidrIp': '0.0.0.0/0',
                'Description': 'Allow all outbound traffic by default',
                'IpProtocol': '-1',
              },
            ],
            'Tags': [
              {
                'Key': 'Name',
                'Value': 'TestStack/MyFleet',
              },
            ],

            'VpcId': 'my-vpc',
          },
        },
        'MyFleetInstanceRole25A84AB8': {
          'Type': 'AWS::IAM::Role',
          'Properties': {
            'AssumeRolePolicyDocument': {
              'Statement': [
                {
                  'Action': 'sts:AssumeRole',
                  'Effect': 'Allow',
                  'Principal': {
                    'Service': 'ec2.amazonaws.com',
                  },
                },
              ],
              'Version': '2012-10-17',
            },
            'Tags': [
              {
                'Key': 'Name',
                'Value': 'TestStack/MyFleet',
              },
            ],
          },
        },
        'MyFleetInstanceProfile70A58496': {
          'Type': 'AWS::IAM::InstanceProfile',
          'Properties': {
            'Roles': [
              {
                'Ref': 'MyFleetInstanceRole25A84AB8',
              },
            ],
          },
        },
        'MyFleetLaunchConfig5D7F9801': {
          'Type': 'AWS::AutoScaling::LaunchConfiguration',
          'Properties': {
            'IamInstanceProfile': {
              'Ref': 'MyFleetInstanceProfile70A58496',
            },
            'ImageId': { 'Ref': 'SsmParameterValueawsserviceamiamazonlinuxlatestamznamihvmx8664gp2C96584B6F00A464EAD1953AFF4B05118Parameter' },
            'InstanceType': 'm4.micro',
            'SecurityGroups': [
              {
                'Fn::GetAtt': [
                  'MyFleetInstanceSecurityGroup774E8234',
                  'GroupId',
                ],
              },
            ],
            'UserData': {
              'Fn::Base64': '#!/bin/bash',
            },
          },
          'DependsOn': [
            'MyFleetInstanceRole25A84AB8',
          ],
        },
        'MyFleetASG88E55886': {
          'Type': 'AWS::AutoScaling::AutoScalingGroup',
          'UpdatePolicy': {
            'AutoScalingScheduledAction': {
              'IgnoreUnmodifiedGroupSizeProperties': true,
            },
          },
          'Properties': {
            'LaunchConfigurationName': {
              'Ref': 'MyFleetLaunchConfig5D7F9801',
            },
            'Tags': [
              {
                'Key': 'Name',
                'PropagateAtLaunch': true,
                'Value': 'TestStack/MyFleet',
              },
            ],

            'MaxSize': '1',
            'MinSize': '1',
            'VPCZoneIdentifier': [
              'pri1',
            ],
          },
        },
      },
    });
  });

  test('can set minCapacity, maxCapacity, desiredCapacity to 0', () => {
    const stack = new cdk.Stack(undefined, 'MyStack', { env: { region: 'us-east-1', account: '1234' } });
    const vpc = mockVpc(stack);

    new autoscaling.AutoScalingGroup(stack, 'MyFleet', {
      instanceType: ec2.InstanceType.of(ec2.InstanceClass.M4, ec2.InstanceSize.MICRO),
      machineImage: new ec2.AmazonLinuxImage(),
      vpc,
      minCapacity: 0,
      maxCapacity: 0,
      desiredCapacity: 0,
    });

    Template.fromStack(stack).hasResourceProperties('AWS::AutoScaling::AutoScalingGroup', {
      MinSize: '0',
      MaxSize: '0',
      DesiredCapacity: '0',
    });
  });

  test('validation is not performed when using Tokens', () => {
    const stack = new cdk.Stack(undefined, 'MyStack', { env: { region: 'us-east-1', account: '1234' } });
    const vpc = mockVpc(stack);

    new autoscaling.AutoScalingGroup(stack, 'MyFleet', {
      instanceType: ec2.InstanceType.of(ec2.InstanceClass.M4, ec2.InstanceSize.MICRO),
      machineImage: new ec2.AmazonLinuxImage(),
      vpc,
      minCapacity: cdk.Lazy.number({ produce: () => 5 }),
      maxCapacity: cdk.Lazy.number({ produce: () => 1 }),
      desiredCapacity: cdk.Lazy.number({ produce: () => 20 }),
    });

    // THEN: no exception
    Template.fromStack(stack).hasResourceProperties('AWS::AutoScaling::AutoScalingGroup', {
      MinSize: '5',
      MaxSize: '1',
      DesiredCapacity: '20',
    });
  });

  test('userdata can be overridden by image', () => {
    // GIVEN
    const stack = new cdk.Stack();
    const vpc = mockVpc(stack);

    const ud = ec2.UserData.forLinux();
    ud.addCommands('it me!');

    // WHEN
    const asg = new autoscaling.AutoScalingGroup(stack, 'MyFleet', {
      instanceType: ec2.InstanceType.of(ec2.InstanceClass.M4, ec2.InstanceSize.MICRO),
      machineImage: new ec2.AmazonLinuxImage({
        userData: ud,
      }),
      vpc,
    });

    // THEN
    expect(asg.userData.render()).toEqual('#!/bin/bash\nit me!');
  });

  test('userdata can be overridden at ASG directly', () => {
    // GIVEN
    const stack = new cdk.Stack();
    const vpc = mockVpc(stack);

    const ud1 = ec2.UserData.forLinux();
    ud1.addCommands('it me!');

    const ud2 = ec2.UserData.forLinux();
    ud2.addCommands('no me!');

    // WHEN
    const asg = new autoscaling.AutoScalingGroup(stack, 'MyFleet', {
      instanceType: ec2.InstanceType.of(ec2.InstanceClass.M4, ec2.InstanceSize.MICRO),
      machineImage: new ec2.AmazonLinuxImage({
        userData: ud1,
      }),
      vpc,
      userData: ud2,
    });

    // THEN
    expect(asg.userData.render()).toEqual('#!/bin/bash\nno me!');
  });

  test('can specify only min capacity', () => {
    // GIVEN
    const stack = new cdk.Stack();
    const vpc = mockVpc(stack);

    // WHEN
    new autoscaling.AutoScalingGroup(stack, 'MyFleet', {
      instanceType: ec2.InstanceType.of(ec2.InstanceClass.M4, ec2.InstanceSize.MICRO),
      machineImage: new ec2.AmazonLinuxImage(),
      vpc,
      minCapacity: 10,
    });

    // THEN
    Template.fromStack(stack).hasResourceProperties('AWS::AutoScaling::AutoScalingGroup', {
      MinSize: '10',
      MaxSize: '10',
    });
  });

  test('can specify only max capacity', () => {
    // GIVEN
    const stack = new cdk.Stack();
    const vpc = mockVpc(stack);

    // WHEN
    new autoscaling.AutoScalingGroup(stack, 'MyFleet', {
      instanceType: ec2.InstanceType.of(ec2.InstanceClass.M4, ec2.InstanceSize.MICRO),
      machineImage: new ec2.AmazonLinuxImage(),
      vpc,
      maxCapacity: 10,
    });

    // THEN
    Template.fromStack(stack).hasResourceProperties('AWS::AutoScaling::AutoScalingGroup', {
      MinSize: '1',
      MaxSize: '10',
    });
  });

  test('can specify only desiredCount', () => {
    // GIVEN
    const stack = new cdk.Stack();
    const vpc = mockVpc(stack);

    // WHEN
    new autoscaling.AutoScalingGroup(stack, 'MyFleet', {
      instanceType: ec2.InstanceType.of(ec2.InstanceClass.M4, ec2.InstanceSize.MICRO),
      machineImage: new ec2.AmazonLinuxImage(),
      vpc,
      desiredCapacity: 10,
    });

    // THEN
    Template.fromStack(stack).hasResourceProperties('AWS::AutoScaling::AutoScalingGroup', {
      MinSize: '1',
      MaxSize: '10',
      DesiredCapacity: '10',
    });
  });

  test('addToRolePolicy can be used to add statements to the role policy', () => {
    const stack = new cdk.Stack(undefined, 'MyStack', { env: { region: 'us-east-1', account: '1234' } });
    const vpc = mockVpc(stack);

    const fleet = new autoscaling.AutoScalingGroup(stack, 'MyFleet', {
      instanceType: ec2.InstanceType.of(ec2.InstanceClass.M4, ec2.InstanceSize.MICRO),
      machineImage: new ec2.AmazonLinuxImage(),
      vpc,
    });

    fleet.addToRolePolicy(new iam.PolicyStatement({
      actions: ['test:SpecialName'],
      resources: ['*'],
    }));

    Template.fromStack(stack).hasResourceProperties('AWS::IAM::Policy', {
      PolicyDocument: {
        Version: '2012-10-17',
        Statement: [
          {
            Action: 'test:SpecialName',
            Effect: 'Allow',
            Resource: '*',
          },
        ],
      },
    });

  });

  testDeprecated('can configure replacing update', () => {
    // GIVEN
    const stack = new cdk.Stack(undefined, 'MyStack', { env: { region: 'us-east-1', account: '1234' } });
    const vpc = mockVpc(stack);

    // WHEN
    new autoscaling.AutoScalingGroup(stack, 'MyFleet', {
      instanceType: ec2.InstanceType.of(ec2.InstanceClass.M4, ec2.InstanceSize.MICRO),
      machineImage: new ec2.AmazonLinuxImage(),
      vpc,
      updateType: autoscaling.UpdateType.REPLACING_UPDATE,
      replacingUpdateMinSuccessfulInstancesPercent: 50,
    });

    // THEN
    Template.fromStack(stack).hasResource('AWS::AutoScaling::AutoScalingGroup', {
      UpdatePolicy: {
        AutoScalingReplacingUpdate: {
          WillReplace: true,
        },
      },
      CreationPolicy: {
        AutoScalingCreationPolicy: {
          MinSuccessfulInstancesPercent: 50,
        },
      },
    });
  });

  testDeprecated('can configure rolling update', () => {
    // GIVEN
    const stack = new cdk.Stack(undefined, 'MyStack', { env: { region: 'us-east-1', account: '1234' } });
    const vpc = mockVpc(stack);

    // WHEN
    new autoscaling.AutoScalingGroup(stack, 'MyFleet', {
      instanceType: ec2.InstanceType.of(ec2.InstanceClass.M4, ec2.InstanceSize.MICRO),
      machineImage: new ec2.AmazonLinuxImage(),
      vpc,
      updateType: autoscaling.UpdateType.ROLLING_UPDATE,
      rollingUpdateConfiguration: {
        minSuccessfulInstancesPercent: 50,
        pauseTime: cdk.Duration.seconds(345),
      },
    });

    // THEN
    Template.fromStack(stack).hasResource('AWS::AutoScaling::AutoScalingGroup', {
      UpdatePolicy: {
        'AutoScalingRollingUpdate': {
          'MinSuccessfulInstancesPercent': 50,
          'WaitOnResourceSignals': true,
          'PauseTime': 'PT5M45S',
          'SuspendProcesses': ['HealthCheck', 'ReplaceUnhealthy', 'AZRebalance', 'AlarmNotification', 'ScheduledActions'],
        },
      },
    });
  });

  testDeprecated('can configure resource signals', () => {
    // GIVEN
    const stack = new cdk.Stack(undefined, 'MyStack', { env: { region: 'us-east-1', account: '1234' } });
    const vpc = mockVpc(stack);

    // WHEN
    new autoscaling.AutoScalingGroup(stack, 'MyFleet', {
      instanceType: ec2.InstanceType.of(ec2.InstanceClass.M4, ec2.InstanceSize.MICRO),
      machineImage: new ec2.AmazonLinuxImage(),
      vpc,
      resourceSignalCount: 5,
      resourceSignalTimeout: cdk.Duration.seconds(666),
    });

    // THEN
    Template.fromStack(stack).hasResource('AWS::AutoScaling::AutoScalingGroup', {
      CreationPolicy: {
        ResourceSignal: {
          Count: 5,
          Timeout: 'PT11M6S',
        },
      },
    });
  });

  test('can configure EC2 health check', () => {
    // GIVEN
    const stack = new cdk.Stack(undefined, 'MyStack', { env: { region: 'us-east-1', account: '1234' } });
    const vpc = mockVpc(stack);

    // WHEN
    new autoscaling.AutoScalingGroup(stack, 'MyFleet', {
      instanceType: ec2.InstanceType.of(ec2.InstanceClass.M4, ec2.InstanceSize.MICRO),
      machineImage: new ec2.AmazonLinuxImage(),
      vpc,
      healthCheck: autoscaling.HealthCheck.ec2(),
    });

    // THEN
    Template.fromStack(stack).hasResourceProperties('AWS::AutoScaling::AutoScalingGroup', {
      HealthCheckType: 'EC2',
    });
  });

  test('can configure EBS health check', () => {
    // GIVEN
    const stack = new cdk.Stack(undefined, 'MyStack', { env: { region: 'us-east-1', account: '1234' } });
    const vpc = mockVpc(stack);

    // WHEN
    new autoscaling.AutoScalingGroup(stack, 'MyFleet', {
      instanceType: ec2.InstanceType.of(ec2.InstanceClass.M4, ec2.InstanceSize.MICRO),
      machineImage: new ec2.AmazonLinuxImage(),
      vpc,
      healthCheck: autoscaling.HealthCheck.elb({ grace: cdk.Duration.minutes(15) }),
    });

    // THEN
    Template.fromStack(stack).hasResourceProperties('AWS::AutoScaling::AutoScalingGroup', {
      HealthCheckType: 'ELB',
      HealthCheckGracePeriod: 900,
    });
  });

  test('can add Security Group to Fleet', () => {
    // GIVEN
    const stack = new cdk.Stack(undefined, 'MyStack', { env: { region: 'us-east-1', account: '1234' } });
    const vpc = mockVpc(stack);

    // WHEN
    const asg = new autoscaling.AutoScalingGroup(stack, 'MyFleet', {
      instanceType: ec2.InstanceType.of(ec2.InstanceClass.M4, ec2.InstanceSize.MICRO),
      machineImage: new ec2.AmazonLinuxImage(),
      vpc,
    });
    asg.addSecurityGroup(mockSecurityGroup(stack));
    Template.fromStack(stack).hasResourceProperties('AWS::AutoScaling::LaunchConfiguration', {
      SecurityGroups: [
        {
          'Fn::GetAtt': [
            'MyFleetInstanceSecurityGroup774E8234',
            'GroupId',
          ],
        },
        'most-secure',
      ],
    });
  });

  test('can set tags', () => {
    // GIVEN
    const stack = getTestStack();
    // new cdk.Stack(undefined, 'MyStack', { env: { region: 'us-east-1', account: '1234' }});
    const vpc = mockVpc(stack);

    // WHEN
    const asg = new autoscaling.AutoScalingGroup(stack, 'MyFleet', {
      instanceType: ec2.InstanceType.of(ec2.InstanceClass.M4, ec2.InstanceSize.MICRO),
      machineImage: new ec2.AmazonLinuxImage(),
      vpc,
      updatePolicy: autoscaling.UpdatePolicy.rollingUpdate(),
    });

    cdk.Tags.of(asg).add('superfood', 'acai');
    cdk.Tags.of(asg).add('notsuper', 'caramel', { applyToLaunchedInstances: false });

    // THEN
    Template.fromStack(stack).hasResourceProperties('AWS::AutoScaling::AutoScalingGroup', {
      Tags: [
        {
          Key: 'Name',
          PropagateAtLaunch: true,
          Value: 'TestStack/MyFleet',
        },
        {
          Key: 'notsuper',
          PropagateAtLaunch: false,
          Value: 'caramel',
        },
        {
          Key: 'superfood',
          PropagateAtLaunch: true,
          Value: 'acai',
        },
      ],
    });
  });

  test('allows setting spot price', () => {
    // GIVEN
    const stack = new cdk.Stack();
    const vpc = mockVpc(stack);

    // WHEN
    const asg = new autoscaling.AutoScalingGroup(stack, 'MyStack', {
      instanceType: ec2.InstanceType.of(ec2.InstanceClass.M4, ec2.InstanceSize.MICRO),
      machineImage: new ec2.AmazonLinuxImage(),
      vpc,

      spotPrice: '0.05',
    });

    // THEN
    expect(asg.spotPrice).toEqual('0.05');
    Template.fromStack(stack).hasResourceProperties('AWS::AutoScaling::LaunchConfiguration', {
      SpotPrice: '0.05',
    });
  });

  test('allows association of public IP address', () => {
    // GIVEN
    const stack = new cdk.Stack();
    const vpc = mockVpc(stack);

    // WHEN
    new autoscaling.AutoScalingGroup(stack, 'MyStack', {
      instanceType: ec2.InstanceType.of(ec2.InstanceClass.M4, ec2.InstanceSize.MICRO),
      machineImage: new ec2.AmazonLinuxImage(),
      vpc,
      minCapacity: 0,
      maxCapacity: 0,
      desiredCapacity: 0,

      vpcSubnets: { subnetType: ec2.SubnetType.PUBLIC },
      associatePublicIpAddress: true,
    });

    // THEN
    Template.fromStack(stack).hasResourceProperties('AWS::AutoScaling::LaunchConfiguration', {
      AssociatePublicIpAddress: true,
    });
  });

  test('association of public IP address requires public subnet', () => {
    // GIVEN
    const stack = new cdk.Stack();
    const vpc = mockVpc(stack);

    // WHEN
    expect(() => {
      new autoscaling.AutoScalingGroup(stack, 'MyStack', {
        instanceType: ec2.InstanceType.of(ec2.InstanceClass.M4, ec2.InstanceSize.MICRO),
        machineImage: new ec2.AmazonLinuxImage(),
        vpc,
        minCapacity: 0,
        maxCapacity: 0,
        desiredCapacity: 0,
        associatePublicIpAddress: true,
      });
    }).toThrow();
  });

  test('allows disassociation of public IP address', () => {
    // GIVEN
    const stack = new cdk.Stack();
    const vpc = mockVpc(stack);

    // WHEN
    new autoscaling.AutoScalingGroup(stack, 'MyStack', {
      instanceType: ec2.InstanceType.of(ec2.InstanceClass.M4, ec2.InstanceSize.MICRO),
      machineImage: new ec2.AmazonLinuxImage(),
      vpc,
      minCapacity: 0,
      maxCapacity: 0,
      desiredCapacity: 0,
      associatePublicIpAddress: false,
    });

    // THEN
    Template.fromStack(stack).hasResourceProperties('AWS::AutoScaling::LaunchConfiguration', {
      AssociatePublicIpAddress: false,
    });
  });

  test('does not specify public IP address association by default', () => {
    // GIVEN
    const stack = new cdk.Stack();
    const vpc = mockVpc(stack);

    // WHEN
    new autoscaling.AutoScalingGroup(stack, 'MyStack', {
      instanceType: ec2.InstanceType.of(ec2.InstanceClass.M4, ec2.InstanceSize.MICRO),
      machineImage: new ec2.AmazonLinuxImage(),
      vpc,
      minCapacity: 0,
      maxCapacity: 0,
      desiredCapacity: 0,
    });

    // THEN
    Template.fromStack(stack).hasResourceProperties('AWS::AutoScaling::LaunchConfiguration', {
      AssociatePublicIpAddress: Match.absent(),
    });
  });

  test('an existing security group can be specified instead of auto-created', () => {
    // GIVEN
    const stack = new cdk.Stack();
    const vpc = mockVpc(stack);
    const securityGroup = ec2.SecurityGroup.fromSecurityGroupId(stack, 'MySG', 'most-secure');

    // WHEN
    new autoscaling.AutoScalingGroup(stack, 'MyASG', {
      vpc,
      instanceType: ec2.InstanceType.of(ec2.InstanceClass.M4, ec2.InstanceSize.MICRO),
      machineImage: new ec2.AmazonLinuxImage(),
      securityGroup,
    });

    // THEN
    Template.fromStack(stack).hasResourceProperties('AWS::AutoScaling::LaunchConfiguration', {
      SecurityGroups: ['most-secure'],
    });
  });

  test('an existing role can be specified instead of auto-created', () => {
    // GIVEN
    const stack = new cdk.Stack();
    const vpc = mockVpc(stack);
    const importedRole = iam.Role.fromRoleArn(stack, 'ImportedRole', 'arn:aws:iam::123456789012:role/HelloDude');

    // WHEN
    const asg = new autoscaling.AutoScalingGroup(stack, 'MyASG', {
      vpc,
      instanceType: ec2.InstanceType.of(ec2.InstanceClass.M4, ec2.InstanceSize.MICRO),
      machineImage: new ec2.AmazonLinuxImage(),
      role: importedRole,
    });

    // THEN
    expect(asg.role).toEqual(importedRole);
    Template.fromStack(stack).hasResourceProperties('AWS::IAM::InstanceProfile', {
      'Roles': ['HelloDude'],
    });
  });

  test('defaultChild is available on an ASG', () => {
    // GIVEN
    const stack = new cdk.Stack();
    const vpc = mockVpc(stack);
    const asg = new autoscaling.AutoScalingGroup(stack, 'MyStack', {
      instanceType: ec2.InstanceType.of(ec2.InstanceClass.M4, ec2.InstanceSize.MICRO),
      machineImage: new ec2.AmazonLinuxImage(),
      vpc,
    });

    // THEN
    expect(asg.node.defaultChild instanceof autoscaling.CfnAutoScalingGroup).toEqual(true);
  });

  testDeprecated('can set blockDeviceMappings', () => {
    // GIVEN
    const stack = new cdk.Stack();
    const vpc = mockVpc(stack);
    new autoscaling.AutoScalingGroup(stack, 'MyStack', {
      instanceType: ec2.InstanceType.of(ec2.InstanceClass.M4, ec2.InstanceSize.MICRO),
      machineImage: new ec2.AmazonLinuxImage(),
      vpc,
      blockDevices: [{
        deviceName: 'ebs',
        mappingEnabled: true,
        volume: autoscaling.BlockDeviceVolume.ebs(15, {
          deleteOnTermination: true,
          encrypted: true,
          volumeType: autoscaling.EbsDeviceVolumeType.IO1,
          iops: 5000,
        }),
      }, {
        deviceName: 'ebs-snapshot',
        volume: autoscaling.BlockDeviceVolume.ebsFromSnapshot('snapshot-id', {
          volumeSize: 500,
          deleteOnTermination: false,
          volumeType: autoscaling.EbsDeviceVolumeType.SC1,
        }),
      }, {
        deviceName: 'ephemeral',
        volume: autoscaling.BlockDeviceVolume.ephemeral(0),
      }, {
        deviceName: 'disabled',
        volume: autoscaling.BlockDeviceVolume.ephemeral(1),
        mappingEnabled: false,
      }, {
        deviceName: 'none',
        volume: autoscaling.BlockDeviceVolume.noDevice(),
      }, {
        deviceName: 'gp3-with-throughput',
        volume: autoscaling.BlockDeviceVolume.ebs(15, {
          volumeType: autoscaling.EbsDeviceVolumeType.GP3,
          throughput: 350,
        }),
      }],
    });

    // THEN
    Template.fromStack(stack).hasResourceProperties('AWS::AutoScaling::LaunchConfiguration', {
      BlockDeviceMappings: [
        {
          DeviceName: 'ebs',
          Ebs: {
            DeleteOnTermination: true,
            Encrypted: true,
            Iops: 5000,
            VolumeSize: 15,
            VolumeType: 'io1',
          },
          NoDevice: Match.absent(),
        },
        {
          DeviceName: 'ebs-snapshot',
          Ebs: {
            DeleteOnTermination: false,
            SnapshotId: 'snapshot-id',
            VolumeSize: 500,
            VolumeType: 'sc1',
          },
          NoDevice: Match.absent(),
        },
        {
          DeviceName: 'ephemeral',
          VirtualName: 'ephemeral0',
          NoDevice: Match.absent(),
        },
        {
          DeviceName: 'disabled',
          NoDevice: true,
        },
        {
          DeviceName: 'none',
          NoDevice: true,
        },
        {
          DeviceName: 'gp3-with-throughput',
          Ebs: {
            VolumeSize: 15,
            VolumeType: 'gp3',
            Throughput: 350,
          },
        },
      ],
    });
  });

  test('can configure maxInstanceLifetime', () => {
    // GIVEN
    const stack = new cdk.Stack();
    const vpc = mockVpc(stack);
    new autoscaling.AutoScalingGroup(stack, 'MyStack', {
      instanceType: ec2.InstanceType.of(ec2.InstanceClass.M4, ec2.InstanceSize.MICRO),
      machineImage: new ec2.AmazonLinuxImage(),
      vpc,
      maxInstanceLifetime: cdk.Duration.days(7),
    });

    // THEN
    Template.fromStack(stack).hasResourceProperties('AWS::AutoScaling::AutoScalingGroup', {
      'MaxInstanceLifetime': 604800,
    });
  });

  test('can configure maxInstanceLifetime with 0', () => {
    // GIVEN
    const stack = new cdk.Stack();
    const vpc = mockVpc(stack);
    new autoscaling.AutoScalingGroup(stack, 'MyStack', {
      instanceType: ec2.InstanceType.of(ec2.InstanceClass.M4, ec2.InstanceSize.MICRO),
      machineImage: new ec2.AmazonLinuxImage(),
      vpc,
      maxInstanceLifetime: cdk.Duration.days(0),
    });

    // THEN
    Template.fromStack(stack).hasResourceProperties('AWS::AutoScaling::AutoScalingGroup', {
      'MaxInstanceLifetime': 0,
    });
  });

  test('throws if maxInstanceLifetime < 1 day', () => {
    // GIVEN
    const stack = new cdk.Stack();
    const vpc = mockVpc(stack);

    // THEN
    expect(() => {
      new autoscaling.AutoScalingGroup(stack, 'MyStack', {
        instanceType: ec2.InstanceType.of(ec2.InstanceClass.M4, ec2.InstanceSize.MICRO),
        machineImage: new ec2.AmazonLinuxImage(),
        vpc,
        maxInstanceLifetime: cdk.Duration.hours(23),
      });
    }).toThrow(/maxInstanceLifetime must be between 1 and 365 days \(inclusive\)/);
  });

  test('throws if maxInstanceLifetime > 365 days', () => {
    // GIVEN
    const stack = new cdk.Stack();
    const vpc = mockVpc(stack);

    // THEN
    expect(() => {
      new autoscaling.AutoScalingGroup(stack, 'MyStack', {
        instanceType: ec2.InstanceType.of(ec2.InstanceClass.M4, ec2.InstanceSize.MICRO),
        machineImage: new ec2.AmazonLinuxImage(),
        vpc,
        maxInstanceLifetime: cdk.Duration.days(366),
      });
    }).toThrow(/maxInstanceLifetime must be between 1 and 365 days \(inclusive\)/);
  });

  test.each([124, 1001])('throws if throughput is set less than 125 or more than 1000', (throughput) => {
    const stack = new cdk.Stack();
    const vpc = mockVpc(stack);

    expect(() => {
      new autoscaling.AutoScalingGroup(stack, 'MyStack', {
        machineImage: new ec2.AmazonLinuxImage(),
        instanceType: ec2.InstanceType.of(ec2.InstanceClass.M4, ec2.InstanceSize.MICRO),
        vpc,
        maxInstanceLifetime: cdk.Duration.days(0),
        blockDevices: [{
          deviceName: 'ebs',
          volume: autoscaling.BlockDeviceVolume.ebs(15, {
            volumeType: autoscaling.EbsDeviceVolumeType.GP3,
            throughput,
          }),
        }],
      });
    }).toThrow(/throughput property takes a minimum of 125 and a maximum of 1000/);
  });

  test.each([
    ...Object.values(autoscaling.EbsDeviceVolumeType).filter((v) => v !== 'gp3'),
  ])('throws if throughput is set on any volume type other than GP3', (volumeType) => {
    const stack = new cdk.Stack();
    const vpc = mockVpc(stack);

    expect(() => {
      new autoscaling.AutoScalingGroup(stack, 'MyStack', {
        machineImage: new ec2.AmazonLinuxImage(),
        instanceType: ec2.InstanceType.of(ec2.InstanceClass.M4, ec2.InstanceSize.MICRO),
        vpc,
        maxInstanceLifetime: cdk.Duration.days(0),
        blockDevices: [{
          deviceName: 'ebs',
          volume: autoscaling.BlockDeviceVolume.ebs(15, {
            volumeType: volumeType,
            throughput: 150,
          }),
        }],
      });
    }).toThrow(/throughput property requires volumeType: EbsDeviceVolumeType.GP3/);
  });

  test('throws if throughput / iops ratio is greater than 0.25', () => {
    const stack = new cdk.Stack();
    const vpc = mockVpc(stack);
    expect(() => {
      new autoscaling.AutoScalingGroup(stack, 'MyStack', {
        machineImage: new ec2.AmazonLinuxImage(),
        instanceType: ec2.InstanceType.of(ec2.InstanceClass.M4, ec2.InstanceSize.MICRO),
        vpc,
        maxInstanceLifetime: cdk.Duration.days(0),
        blockDevices: [{
          deviceName: 'ebs',
          volume: autoscaling.BlockDeviceVolume.ebs(15, {
            volumeType: autoscaling.EbsDeviceVolumeType.GP3,
            throughput: 751,
            iops: 3000,
          }),
        }],
      });
    }).toThrow('Throughput (MiBps) to iops ratio of 0.25033333333333335 is too high; maximum is 0.25 MiBps per iops');
  });

  test('can configure instance monitoring', () => {
    // GIVEN
    const stack = new cdk.Stack();
    const vpc = mockVpc(stack);

    // WHEN
    new autoscaling.AutoScalingGroup(stack, 'MyStack', {
      instanceType: ec2.InstanceType.of(ec2.InstanceClass.M4, ec2.InstanceSize.MICRO),
      machineImage: new ec2.AmazonLinuxImage(),
      vpc,
      instanceMonitoring: autoscaling.Monitoring.BASIC,
    });

    // THEN
    Template.fromStack(stack).hasResourceProperties('AWS::AutoScaling::LaunchConfiguration', {
      InstanceMonitoring: false,
    });
  });

  test('instance monitoring defaults to absent', () => {
    // GIVEN
    const stack = new cdk.Stack();
    const vpc = mockVpc(stack);

    // WHEN
    new autoscaling.AutoScalingGroup(stack, 'MyStack', {
      instanceType: ec2.InstanceType.of(ec2.InstanceClass.M4, ec2.InstanceSize.MICRO),
      machineImage: new ec2.AmazonLinuxImage(),
      vpc,
    });

    // THEN
    Template.fromStack(stack).hasResourceProperties('AWS::AutoScaling::LaunchConfiguration', {
      InstanceMonitoring: Match.absent(),
    });
  });

  test('throws if ephemeral volumeIndex < 0', () => {
    // GIVEN
    const stack = new cdk.Stack();
    const vpc = mockVpc(stack);

    // THEN
    expect(() => {
      new autoscaling.AutoScalingGroup(stack, 'MyStack', {
        instanceType: ec2.InstanceType.of(ec2.InstanceClass.M4, ec2.InstanceSize.MICRO),
        machineImage: new ec2.AmazonLinuxImage(),
        vpc,
        blockDevices: [{
          deviceName: 'ephemeral',
          volume: autoscaling.BlockDeviceVolume.ephemeral(-1),
        }],
      });
    }).toThrow(/volumeIndex must be a number starting from 0/);
  });

  test('throws if volumeType === IO1 without iops', () => {
    // GIVEN
    const stack = new cdk.Stack();
    const vpc = mockVpc(stack);

    // THEN
    expect(() => {
      new autoscaling.AutoScalingGroup(stack, 'MyStack', {
        instanceType: ec2.InstanceType.of(ec2.InstanceClass.M4, ec2.InstanceSize.MICRO),
        machineImage: new ec2.AmazonLinuxImage(),
        vpc,
        blockDevices: [{
          deviceName: 'ebs',
          volume: autoscaling.BlockDeviceVolume.ebs(15, {
            deleteOnTermination: true,
            encrypted: true,
            volumeType: autoscaling.EbsDeviceVolumeType.IO1,
          }),
        }],
      });
    }).toThrow(/ops property is required with volumeType: EbsDeviceVolumeType.IO1/);
  });

  test('warning if iops without volumeType', () => {
    // GIVEN
    const stack = new cdk.Stack();
    const vpc = mockVpc(stack);

    new autoscaling.AutoScalingGroup(stack, 'MyStack', {
      instanceType: ec2.InstanceType.of(ec2.InstanceClass.M4, ec2.InstanceSize.MICRO),
      machineImage: new ec2.AmazonLinuxImage(),
      vpc,
      blockDevices: [{
        deviceName: 'ebs',
        volume: autoscaling.BlockDeviceVolume.ebs(15, {
          deleteOnTermination: true,
          encrypted: true,
          iops: 5000,
        }),
      }],
    });

    // THEN
    Annotations.fromStack(stack).hasWarning('/Default/MyStack', 'iops will be ignored without volumeType: EbsDeviceVolumeType.IO1');
  });

  test('warning if iops and volumeType !== IO1', () => {
    // GIVEN
    const stack = new cdk.Stack();
    const vpc = mockVpc(stack);

    new autoscaling.AutoScalingGroup(stack, 'MyStack', {
      instanceType: ec2.InstanceType.of(ec2.InstanceClass.M4, ec2.InstanceSize.MICRO),
      machineImage: new ec2.AmazonLinuxImage(),
      vpc,
      blockDevices: [{
        deviceName: 'ebs',
        volume: autoscaling.BlockDeviceVolume.ebs(15, {
          deleteOnTermination: true,
          encrypted: true,
          volumeType: autoscaling.EbsDeviceVolumeType.GP2,
          iops: 5000,
        }),
      }],
    });

    // THEN
    Annotations.fromStack(stack).hasWarning('/Default/MyStack', 'iops will be ignored without volumeType: EbsDeviceVolumeType.IO1');
  });

  test('step scaling on metric', () => {
    // GIVEN
    const stack = new cdk.Stack();
    const vpc = mockVpc(stack);
    const asg = new autoscaling.AutoScalingGroup(stack, 'MyStack', {
      instanceType: ec2.InstanceType.of(ec2.InstanceClass.M4, ec2.InstanceSize.MICRO),
      machineImage: new ec2.AmazonLinuxImage(),
      vpc,
    });

    // WHEN
    asg.scaleOnMetric('Metric', {
      metric: new cloudwatch.Metric({
        namespace: 'Test',
        metricName: 'Metric',
      }),
      adjustmentType: autoscaling.AdjustmentType.CHANGE_IN_CAPACITY,
      scalingSteps: [
        { change: -1, lower: 0, upper: 49 },
        { change: 0, lower: 50, upper: 99 },
        { change: 1, lower: 100 },
      ],
    });

    // THEN
    Template.fromStack(stack).hasResourceProperties('AWS::CloudWatch::Alarm', {
      ComparisonOperator: 'LessThanOrEqualToThreshold',
      EvaluationPeriods: 1,
      MetricName: 'Metric',
      Namespace: 'Test',
      Period: 300,
    });
  });

  test('step scaling on MathExpression', () => {
    // GIVEN
    const stack = new cdk.Stack();
    const vpc = mockVpc(stack);
    const asg = new autoscaling.AutoScalingGroup(stack, 'MyStack', {
      instanceType: ec2.InstanceType.of(ec2.InstanceClass.M4, ec2.InstanceSize.MICRO),
      machineImage: new ec2.AmazonLinuxImage(),
      vpc,
    });

    // WHEN
    asg.scaleOnMetric('Metric', {
      metric: new cloudwatch.MathExpression({
        expression: 'a',
        usingMetrics: {
          a: new cloudwatch.Metric({
            namespace: 'Test',
            metricName: 'Metric',
          }),
        },
      }),
      adjustmentType: autoscaling.AdjustmentType.CHANGE_IN_CAPACITY,
      scalingSteps: [
        { change: -1, lower: 0, upper: 49 },
        { change: 0, lower: 50, upper: 99 },
        { change: 1, lower: 100 },
      ],
    });

    // THEN
    Template.fromStack(stack).hasResourceProperties('AWS::CloudWatch::Alarm', Match.not({
      Period: 60,
    }));

    Template.fromStack(stack).hasResourceProperties('AWS::CloudWatch::Alarm', {
      'ComparisonOperator': 'LessThanOrEqualToThreshold',
      'EvaluationPeriods': 1,
      'Metrics': [
        {
          'Expression': 'a',
          'Id': 'expr_1',
        },
        {
          'Id': 'a',
          'MetricStat': {
            'Metric': {
              'MetricName': 'Metric',
              'Namespace': 'Test',
            },
            'Period': 300,
            'Stat': 'Average',
          },
          'ReturnData': false,
        },
      ],
      'Threshold': 49,
    });
  });

  test('test GroupMetrics.all(), adds a single MetricsCollection with no Metrics specified', () => {
    // GIVEN
    const stack = new cdk.Stack();
    const vpc = mockVpc(stack);
    // When
    new autoscaling.AutoScalingGroup(stack, 'ASG', {
      instanceType: ec2.InstanceType.of(ec2.InstanceClass.M4, ec2.InstanceSize.MICRO),
      machineImage: new ec2.AmazonLinuxImage(),
      vpc,
      groupMetrics: [autoscaling.GroupMetrics.all()],
    });

    // Then
    Template.fromStack(stack).hasResourceProperties('AWS::AutoScaling::AutoScalingGroup', {
      MetricsCollection: [
        {
          Granularity: '1Minute',
          Metrics: Match.absent(),
        },
      ],
    });
  });

  test('test can specify a subset of group metrics', () => {
    // GIVEN
    const stack = new cdk.Stack();
    const vpc = mockVpc(stack);

    // WHEN
    new autoscaling.AutoScalingGroup(stack, 'ASG', {
      instanceType: ec2.InstanceType.of(ec2.InstanceClass.M4, ec2.InstanceSize.MICRO),
      machineImage: new ec2.AmazonLinuxImage(),
      groupMetrics: [
        new autoscaling.GroupMetrics(autoscaling.GroupMetric.MIN_SIZE,
          autoscaling.GroupMetric.MAX_SIZE,
          autoscaling.GroupMetric.DESIRED_CAPACITY,
          autoscaling.GroupMetric.IN_SERVICE_INSTANCES),
        new autoscaling.GroupMetrics(autoscaling.GroupMetric.PENDING_INSTANCES,
          autoscaling.GroupMetric.STANDBY_INSTANCES,
          autoscaling.GroupMetric.TOTAL_INSTANCES,
          autoscaling.GroupMetric.TERMINATING_INSTANCES,
        ),
      ],
      vpc,
    });

    // Then
    Template.fromStack(stack).hasResourceProperties('AWS::AutoScaling::AutoScalingGroup', {
      MetricsCollection: [
        {
          Granularity: '1Minute',
          Metrics: ['GroupMinSize', 'GroupMaxSize', 'GroupDesiredCapacity', 'GroupInServiceInstances'],
        }, {
          Granularity: '1Minute',
          Metrics: ['GroupPendingInstances', 'GroupStandbyInstances', 'GroupTotalInstances', 'GroupTerminatingInstances'],
        },
      ],
    });
  });

  test('test deduplication of group metrics ', () => {
    // GIVEN
    const stack = new cdk.Stack();
    const vpc = mockVpc(stack);
    new autoscaling.AutoScalingGroup(stack, 'ASG', {
      instanceType: ec2.InstanceType.of(ec2.InstanceClass.M4, ec2.InstanceSize.MICRO),
      machineImage: new ec2.AmazonLinuxImage(),
      vpc,
      groupMetrics: [new autoscaling.GroupMetrics(autoscaling.GroupMetric.MIN_SIZE,
        autoscaling.GroupMetric.MAX_SIZE,
        autoscaling.GroupMetric.MAX_SIZE,
        autoscaling.GroupMetric.MIN_SIZE,
      )],
    });

    // Then
    Template.fromStack(stack).hasResourceProperties('AWS::AutoScaling::AutoScalingGroup', {
      MetricsCollection: [
        {
          Granularity: '1Minute',
          Metrics: ['GroupMinSize', 'GroupMaxSize'],
        },
      ],
    });
  });

  test('allow configuring notifications', () => {
    // GIVEN
    const stack = new cdk.Stack();
    const vpc = mockVpc(stack);
    const topic = new sns.Topic(stack, 'MyTopic');

    // WHEN
    new autoscaling.AutoScalingGroup(stack, 'MyASG', {
      instanceType: ec2.InstanceType.of(ec2.InstanceClass.M4, ec2.InstanceSize.MICRO),
      machineImage: new ec2.AmazonLinuxImage(),
      vpc,
      notifications: [
        {
          topic,
          scalingEvents: autoscaling.ScalingEvents.ERRORS,
        },
        {
          topic,
          scalingEvents: new autoscaling.ScalingEvents(autoscaling.ScalingEvent.INSTANCE_TERMINATE),
        },
      ],
    });

    // THEN
    Template.fromStack(stack).hasResourceProperties('AWS::AutoScaling::AutoScalingGroup', {
      NotificationConfigurations: [
        {
          TopicARN: { Ref: 'MyTopic86869434' },
          NotificationTypes: [
            'autoscaling:EC2_INSTANCE_LAUNCH_ERROR',
            'autoscaling:EC2_INSTANCE_TERMINATE_ERROR',
          ],
        },
        {
          TopicARN: { Ref: 'MyTopic86869434' },
          NotificationTypes: [
            'autoscaling:EC2_INSTANCE_TERMINATE',
          ],
        },
      ],
    });
  });

  testDeprecated('throw if notification and notificationsTopics are both configured', () => {
    // GIVEN
    const stack = new cdk.Stack();
    const vpc = mockVpc(stack);
    const topic = new sns.Topic(stack, 'MyTopic');

    // THEN
    expect(() => {
      new autoscaling.AutoScalingGroup(stack, 'MyASG', {
        instanceType: ec2.InstanceType.of(ec2.InstanceClass.M4, ec2.InstanceSize.MICRO),
        machineImage: new ec2.AmazonLinuxImage(),
        vpc,
        notificationsTopic: topic,
        notifications: [{
          topic,
        }],
      });
    }).toThrow('Cannot set \'notificationsTopic\' and \'notifications\', \'notificationsTopic\' is deprecated use \'notifications\' instead');
  });

  test('notificationTypes default includes all non test NotificationType', () => {
    // GIVEN
    const stack = new cdk.Stack();
    const vpc = mockVpc(stack);
    const topic = new sns.Topic(stack, 'MyTopic');

    // WHEN
    new autoscaling.AutoScalingGroup(stack, 'MyASG', {
      instanceType: ec2.InstanceType.of(ec2.InstanceClass.M4, ec2.InstanceSize.MICRO),
      machineImage: new ec2.AmazonLinuxImage(),
      vpc,
      notifications: [
        {
          topic,
        },
      ],
    });

    // THEN
    Template.fromStack(stack).hasResourceProperties('AWS::AutoScaling::AutoScalingGroup', {
      NotificationConfigurations: [
        {
          TopicARN: { Ref: 'MyTopic86869434' },
          NotificationTypes: [
            'autoscaling:EC2_INSTANCE_LAUNCH',
            'autoscaling:EC2_INSTANCE_LAUNCH_ERROR',
            'autoscaling:EC2_INSTANCE_TERMINATE',
            'autoscaling:EC2_INSTANCE_TERMINATE_ERROR',
          ],
        },
      ],
    });
  });

  testDeprecated('setting notificationTopic configures all non test NotificationType', () => {
    // GIVEN
    const stack = new cdk.Stack();
    const vpc = mockVpc(stack);
    const topic = new sns.Topic(stack, 'MyTopic');

    // WHEN
    new autoscaling.AutoScalingGroup(stack, 'MyASG', {
      instanceType: ec2.InstanceType.of(ec2.InstanceClass.M4, ec2.InstanceSize.MICRO),
      machineImage: new ec2.AmazonLinuxImage(),
      vpc,
      notificationsTopic: topic,
    });

    // THEN
    Template.fromStack(stack).hasResourceProperties('AWS::AutoScaling::AutoScalingGroup', {
      NotificationConfigurations: [
        {
          TopicARN: { Ref: 'MyTopic86869434' },
          NotificationTypes: [
            'autoscaling:EC2_INSTANCE_LAUNCH',
            'autoscaling:EC2_INSTANCE_LAUNCH_ERROR',
            'autoscaling:EC2_INSTANCE_TERMINATE',
            'autoscaling:EC2_INSTANCE_TERMINATE_ERROR',
          ],
        },
      ],
    });
  });

  test('NotificationTypes.ALL includes all non test NotificationType', () => {
    expect(Object.values(autoscaling.ScalingEvent).length - 1).toEqual(autoscaling.ScalingEvents.ALL._types.length);

  });

  test('Can protect new instances from scale-in via constructor property', () => {
    // GIVEN
    const stack = new cdk.Stack();
    const vpc = mockVpc(stack);

    // WHEN
    const asg = new autoscaling.AutoScalingGroup(stack, 'MyASG', {
      instanceType: ec2.InstanceType.of(ec2.InstanceClass.M4, ec2.InstanceSize.MICRO),
      machineImage: new ec2.AmazonLinuxImage(),
      vpc,
      newInstancesProtectedFromScaleIn: true,
    });

    // THEN
    expect(asg.areNewInstancesProtectedFromScaleIn()).toEqual(true);
    Template.fromStack(stack).hasResourceProperties('AWS::AutoScaling::AutoScalingGroup', {
      NewInstancesProtectedFromScaleIn: true,
    });
  });

  test('Can protect new instances from scale-in via setter', () => {
    // GIVEN
    const stack = new cdk.Stack();
    const vpc = mockVpc(stack);

    // WHEN
    const asg = new autoscaling.AutoScalingGroup(stack, 'MyASG', {
      instanceType: ec2.InstanceType.of(ec2.InstanceClass.M4, ec2.InstanceSize.MICRO),
      machineImage: new ec2.AmazonLinuxImage(),
      vpc,
    });
    asg.protectNewInstancesFromScaleIn();

    // THEN
    expect(asg.areNewInstancesProtectedFromScaleIn()).toEqual(true);
    Template.fromStack(stack).hasResourceProperties('AWS::AutoScaling::AutoScalingGroup', {
      NewInstancesProtectedFromScaleIn: true,
    });
  });

  test('requires imdsv2', () => {
    // GIVEN
    const stack = new cdk.Stack();
    const vpc = mockVpc(stack);

    // WHEN
    new autoscaling.AutoScalingGroup(stack, 'MyASG', {
      vpc,
      instanceType: new ec2.InstanceType('t2.micro'),
      machineImage: ec2.MachineImage.latestAmazonLinux(),
      requireImdsv2: true,
    });

    // THEN
    Template.fromStack(stack).hasResourceProperties('AWS::AutoScaling::LaunchConfiguration', {
      MetadataOptions: {
        HttpTokens: 'required',
      },
    });
  });

  test('supports termination policies', () => {
    // GIVEN
    const stack = new cdk.Stack();
    const vpc = mockVpc(stack);

    // WHEN
    new autoscaling.AutoScalingGroup(stack, 'MyASG', {
      vpc,
      instanceType: new ec2.InstanceType('t2.micro'),
      machineImage: ec2.MachineImage.latestAmazonLinux(),
      terminationPolicies: [
        autoscaling.TerminationPolicy.OLDEST_INSTANCE,
        autoscaling.TerminationPolicy.DEFAULT,
      ],
    });

    // THEN
    Template.fromStack(stack).hasResourceProperties('AWS::AutoScaling::AutoScalingGroup', {
      TerminationPolicies: [
        'OldestInstance',
        'Default',
      ],
    });
  });

  test('Can use imported Launch Template with ID', () => {
    // GIVEN
    const stack = new cdk.Stack();

    // WHEN
    new autoscaling.AutoScalingGroup(stack, 'imported-lt-asg', {
      launchTemplate: LaunchTemplate.fromLaunchTemplateAttributes(stack, 'imported-lt', {
        launchTemplateId: 'test-lt-id',
        versionNumber: '0',
      }),
      vpc: mockVpc(stack),
    });

    // THEN
    Template.fromStack(stack).hasResourceProperties('AWS::AutoScaling::AutoScalingGroup', {
      LaunchTemplate: {
        LaunchTemplateId: 'test-lt-id',
        Version: '0',
      },
    });
  });

  test('Can use imported Launch Template with name', () => {
    // GIVEN
    const stack = new cdk.Stack();

    // WHEN
    new autoscaling.AutoScalingGroup(stack, 'imported-lt-asg', {
      launchTemplate: LaunchTemplate.fromLaunchTemplateAttributes(stack, 'imported-lt', {
        launchTemplateName: 'test-lt',
        versionNumber: '0',
      }),
      vpc: mockVpc(stack),
    });

    // THEN
    Template.fromStack(stack).hasResourceProperties('AWS::AutoScaling::AutoScalingGroup', {
      LaunchTemplate: {
        LaunchTemplateName: 'test-lt',
        Version: '0',
      },
    });
  });

  test('Can use in-stack Launch Template reference', () => {
    // GIVEN
    const stack = new cdk.Stack();

    // WHEN
    const lt = new LaunchTemplate(stack, 'lt', {
      instanceType: new InstanceType('t3.micro'),
      machineImage: new AmazonLinuxImage({
        generation: AmazonLinuxGeneration.AMAZON_LINUX_2,
        cpuType: AmazonLinuxCpuType.X86_64,
      }),
    });

    new autoscaling.AutoScalingGroup(stack, 'imported-lt-asg', {
      launchTemplate: lt,
      vpc: mockVpc(stack),
    });

    // THEN
    Template.fromStack(stack).hasResourceProperties('AWS::AutoScaling::AutoScalingGroup', {
      LaunchTemplate: {
        LaunchTemplateId: {
          'Ref': 'ltB6511CF5',
        },
        Version: {
          'Fn::GetAtt': [
            'ltB6511CF5',
            'LatestVersionNumber',
          ],
        },
      },
    });
  });

  test('Can use mixed instance policy', () => {
    // GIVEN
    const stack = new cdk.Stack();

    // WHEN
    const lt = LaunchTemplate.fromLaunchTemplateAttributes(stack, 'imported-lt', {
      launchTemplateId: 'test-lt-id',
      versionNumber: '0',
    });

    new autoscaling.AutoScalingGroup(stack, 'mip-asg', {
      mixedInstancesPolicy: {
        launchTemplate: lt,
        launchTemplateOverrides: [{
          instanceType: new InstanceType('t4g.micro'),
          launchTemplate: lt,
          weightedCapacity: 9,
        }],
        instancesDistribution: {
          onDemandAllocationStrategy: OnDemandAllocationStrategy.PRIORITIZED,
          onDemandBaseCapacity: 1,
          onDemandPercentageAboveBaseCapacity: 2,
          spotAllocationStrategy: SpotAllocationStrategy.CAPACITY_OPTIMIZED_PRIORITIZED,
          spotInstancePools: 3,
          spotMaxPrice: '4',
        },
      },
      vpc: mockVpc(stack),
    });

    // THEN
    Template.fromStack(stack).hasResourceProperties('AWS::AutoScaling::AutoScalingGroup', {
      MixedInstancesPolicy: {
        LaunchTemplate: {
          LaunchTemplateSpecification: {
            LaunchTemplateId: 'test-lt-id',
            Version: '0',
          },
          Overrides: [
            {
              InstanceType: 't4g.micro',
              LaunchTemplateSpecification: {
                LaunchTemplateId: 'test-lt-id',
                Version: '0',
              },
              WeightedCapacity: '9',
            },
          ],
        },
        InstancesDistribution: {
          OnDemandAllocationStrategy: 'prioritized',
          OnDemandBaseCapacity: 1,
          OnDemandPercentageAboveBaseCapacity: 2,
          SpotAllocationStrategy: 'capacity-optimized-prioritized',
          SpotInstancePools: 3,
          SpotMaxPrice: '4',
        },
      },
    });
  });

  test('Can use mixed instance policy without instances distribution', () => {
    // GIVEN
    const stack = new cdk.Stack();

    // WHEN
    const lt = LaunchTemplate.fromLaunchTemplateAttributes(stack, 'imported-lt', {
      launchTemplateId: 'test-lt-id',
      versionNumber: '0',
    });

    new autoscaling.AutoScalingGroup(stack, 'mip-asg', {
      mixedInstancesPolicy: {
        launchTemplate: lt,
        launchTemplateOverrides: [{
          instanceType: new InstanceType('t4g.micro'),
          launchTemplate: lt,
          weightedCapacity: 9,
        }],
      },
      vpc: mockVpc(stack),
    });

    // THEN
    Template.fromStack(stack).hasResourceProperties('AWS::AutoScaling::AutoScalingGroup', {
      MixedInstancesPolicy: {
        LaunchTemplate: {
          LaunchTemplateSpecification: {
            LaunchTemplateId: 'test-lt-id',
            Version: '0',
          },
          Overrides: [
            {
              InstanceType: 't4g.micro',
              LaunchTemplateSpecification: {
                LaunchTemplateId: 'test-lt-id',
                Version: '0',
              },
              WeightedCapacity: '9',
            },
          ],
        },
      },
    });
  });

  test('Cannot specify both Launch Template and Launch Config', () => {
    // GIVEN
    const stack = new cdk.Stack();

    // WHEN
    const lt = LaunchTemplate.fromLaunchTemplateAttributes(stack, 'imported-lt', {
      launchTemplateId: 'test-lt-id',
      versionNumber: '0',
    });
    const vpc = mockVpc(stack);

    // THEN
    expect(() => {
      new autoscaling.AutoScalingGroup(stack, 'imported-lt-asg', {
        launchTemplate: lt,
        instanceType: new InstanceType('t3.micro'),
        machineImage: new AmazonLinuxImage({
          generation: AmazonLinuxGeneration.AMAZON_LINUX_2,
          cpuType: AmazonLinuxCpuType.X86_64,
        }),
        vpc,
      });
    }).toThrow('Setting \'machineImage\' must not be set when \'launchTemplate\' or \'mixedInstancesPolicy\' is set');
    expect(() => {
      new autoscaling.AutoScalingGroup(stack, 'imported-lt-asg-2', {
        launchTemplate: lt,
        associatePublicIpAddress: true,
        vpc,
      });
    }).toThrow('Setting \'associatePublicIpAddress\' must not be set when \'launchTemplate\' or \'mixedInstancesPolicy\' is set');
  });

  test('Cannot specify Launch Template without instance type', () => {
    // GIVEN
    const stack = new cdk.Stack();

    // WHEN
    const lt = new LaunchTemplate(stack, 'lt', {
      machineImage: new AmazonLinuxImage({
        generation: AmazonLinuxGeneration.AMAZON_LINUX_2,
        cpuType: AmazonLinuxCpuType.X86_64,
      }),
    });

    // THEN
    expect(() => {
      new autoscaling.AutoScalingGroup(stack, 'imported-lt-asg', {
        launchTemplate: lt,
        vpc: mockVpc(stack),
      });
    }).toThrow('Setting \'launchTemplate\' requires its \'instanceType\' to be set');
  });

  test('Cannot specify Launch Template without machine image', () => {
    // GIVEN
    const stack = new cdk.Stack();

    // WHEN
    const lt = new LaunchTemplate(stack, 'lt', {
      instanceType: new InstanceType('t3.micro'),
    });

    // THEN
    expect(() => {
      new autoscaling.AutoScalingGroup(stack, 'imported-lt-asg', {
        launchTemplate: lt,
        vpc: mockVpc(stack),
      });
    }).toThrow('Setting \'launchTemplate\' requires its \'machineImage\' to be set');
  });

  test('Cannot specify mixed instance policy without machine image', () => {
    // GIVEN
    const stack = new cdk.Stack();

    // WHEN
    const lt = new LaunchTemplate(stack, 'lt', {
      instanceType: new InstanceType('t3.micro'),
    });

    // THEN
    expect(() => {
      new autoscaling.AutoScalingGroup(stack, 'imported-lt-asg', {
        mixedInstancesPolicy: {
          launchTemplate: lt,
          launchTemplateOverrides: [{
            instanceType: new InstanceType('t3.micro'),
          }],
        },
        vpc: mockVpc(stack),
      });
    }).toThrow('Setting \'mixedInstancesPolicy.launchTemplate\' requires its \'machineImage\' to be set');
  });

  test('Cannot be created with launch configuration without machine image', () => {
    // GIVEN
    const stack = new cdk.Stack();

    // THEN
    expect(() => {
      new autoscaling.AutoScalingGroup(stack, 'imported-lt-asg', {
        instanceType: new InstanceType('t3.micro'),
        vpc: mockVpc(stack),
      });
    }).toThrow('Setting \'machineImage\' is required when \'launchTemplate\' and \'mixedInstancesPolicy\' is not set');
  });

  test('Cannot be created with launch configuration without instance type', () => {
    // GIVEN
    const stack = new cdk.Stack();

    // THEN
    expect(() => {
      new autoscaling.AutoScalingGroup(stack, 'imported-lt-asg', {
        machineImage: new AmazonLinuxImage({
          generation: AmazonLinuxGeneration.AMAZON_LINUX_2,
          cpuType: AmazonLinuxCpuType.X86_64,
        }),
        vpc: mockVpc(stack),
      });
    }).toThrow('Setting \'instanceType\' is required when \'launchTemplate\' and \'mixedInstancesPolicy\' is not set');
  });

  test('Should throw when accessing inferred fields with imported Launch Template', () => {
    // GIVEN
    const stack = new cdk.Stack();

    // WHEN
    const asg = new autoscaling.AutoScalingGroup(stack, 'imported-lt-asg', {
      launchTemplate: LaunchTemplate.fromLaunchTemplateAttributes(stack, 'imported-lt', {
        launchTemplateId: 'test-lt-id',
        versionNumber: '0',
      }),
      vpc: mockVpc(stack),
    });

    // THEN
    expect(() => {
      asg.userData;
    }).toThrow('The provided launch template does not expose its user data.');

    expect(() => {
      asg.connections;
    }).toThrow('AutoScalingGroup can only be used as IConnectable if it is not created from an imported Launch Template.');

    expect(() => {
      asg.role;
    }).toThrow('The provided launch template does not expose or does not define its role.');

    expect(() => {
      asg.addSecurityGroup(mockSecurityGroup(stack));
    }).toThrow('You cannot add security groups when the Auto Scaling Group is created from a Launch Template.');
  });

  test('Should throw when accessing inferred fields with in-stack Launch Template not having corresponding properties', () => {
    // GIVEN
    const stack = new cdk.Stack();

    // WHEN
    const asg = new autoscaling.AutoScalingGroup(stack, 'imported-lt-asg', {
      launchTemplate: new LaunchTemplate(stack, 'in-stack-lt', {
        instanceType: new ec2.InstanceType('t3.micro'),
        machineImage: new ec2.AmazonLinuxImage({
          generation: ec2.AmazonLinuxGeneration.AMAZON_LINUX_2,
          cpuType: ec2.AmazonLinuxCpuType.X86_64,
        }),
      }),
      vpc: mockVpc(stack),
    });

    // THEN
    expect(() => {
      asg.userData;
    }).toThrow('The provided launch template does not expose its user data.');

    expect(() => {
      asg.connections;
    }).toThrow('LaunchTemplate can only be used as IConnectable if a securityGroup is provided when constructing it.');

    expect(() => {
      asg.role;
    }).toThrow('The provided launch template does not expose or does not define its role.');

    expect(() => {
      asg.addSecurityGroup(mockSecurityGroup(stack));
    }).toThrow('You cannot add security groups when the Auto Scaling Group is created from a Launch Template.');
  });

  test('Should not throw when accessing inferred fields with in-stack Launch Template having corresponding properties', () => {
    // GIVEN
    const stack = new cdk.Stack();

    // WHEN
    const asg = new autoscaling.AutoScalingGroup(stack, 'imported-lt-asg', {
      launchTemplate: new LaunchTemplate(stack, 'in-stack-lt', {
        instanceType: new ec2.InstanceType('t3.micro'),
        machineImage: new ec2.AmazonLinuxImage({
          generation: ec2.AmazonLinuxGeneration.AMAZON_LINUX_2,
          cpuType: ec2.AmazonLinuxCpuType.X86_64,
        }),
        userData: ec2.UserData.forLinux(),
        securityGroup: ec2.SecurityGroup.fromSecurityGroupId(stack, 'MySG2', 'most-secure'),
        role: iam.Role.fromRoleArn(stack, 'ImportedRole', 'arn:aws:iam::123456789012:role/HelloDude'),
      }),
      vpc: mockVpc(stack),
    });

    // THEN
    expect(() => {
      asg.userData;
    }).not.toThrow();

    expect(() => {
      asg.connections;
    }).not.toThrow();

    expect(() => {
      asg.role;
    }).not.toThrow();

    expect(() => {
      asg.addSecurityGroup(mockSecurityGroup(stack));
    }).toThrow('You cannot add security groups when the Auto Scaling Group is created from a Launch Template.');
  });

  test('Should not throw when LaunchTemplate is used with CloudformationInit', () => {
    const stack = new cdk.Stack();

    // WHEN
    const lt = new LaunchTemplate(stack, 'LaunchTemplate', {
      machineImage: new AmazonLinuxImage(),
      instanceType: new ec2.InstanceType('t3.micro'),
      userData: ec2.UserData.forLinux(),
      securityGroup: ec2.SecurityGroup.fromSecurityGroupId(stack, 'ImportedSg', 'securityGroupId'),
      role: iam.Role.fromRoleArn(stack, 'ImportedRole', 'arn:aws:iam::123456789012:role/MockRole'),
    });

    const cfInit = ec2.CloudFormationInit.fromElements(
      ec2.InitCommand.shellCommand('/bash'),
    );

    // THEN
    expect(() => new autoscaling.AutoScalingGroup(stack, 'Asg', {
      launchTemplate: lt,
      init: cfInit,
      vpc: mockVpc(stack),
      signals: autoscaling.Signals.waitForAll(),
    })).not.toThrow();

  });
});

function mockVpc(stack: cdk.Stack) {
  return ec2.Vpc.fromVpcAttributes(stack, 'MyVpc', {
    vpcId: 'my-vpc',
    availabilityZones: ['az1'],
    publicSubnetIds: ['pub1'],
    privateSubnetIds: ['pri1'],
    isolatedSubnetIds: [],
  });
}

test('Can set autoScalingGroupName', () => {
  // GIVEN
  const stack = new cdk.Stack();
  const vpc = mockVpc(stack);

  // WHEN
  new autoscaling.AutoScalingGroup(stack, 'MyASG', {
    instanceType: ec2.InstanceType.of(ec2.InstanceClass.M4, ec2.InstanceSize.MICRO),
    machineImage: new ec2.AmazonLinuxImage(),
    vpc,
    autoScalingGroupName: 'MyAsg',
  });

  // THEN
  Template.fromStack(stack).hasResourceProperties('AWS::AutoScaling::AutoScalingGroup', {
    AutoScalingGroupName: 'MyAsg',
  });
});

test('can use Vpc imported from unparseable list tokens', () => {
  // GIVEN
  const stack = new cdk.Stack();

  const vpcId = cdk.Fn.importValue('myVpcId');
  const availabilityZones = cdk.Fn.split(',', cdk.Fn.importValue('myAvailabilityZones'));
  const publicSubnetIds = cdk.Fn.split(',', cdk.Fn.importValue('myPublicSubnetIds'));
  const privateSubnetIds = cdk.Fn.split(',', cdk.Fn.importValue('myPrivateSubnetIds'));
  const isolatedSubnetIds = cdk.Fn.split(',', cdk.Fn.importValue('myIsolatedSubnetIds'));

  const vpc = ec2.Vpc.fromVpcAttributes(stack, 'importedVpc', {
    vpcId,
    availabilityZones,
    publicSubnetIds,
    privateSubnetIds,
    isolatedSubnetIds,
  });

  // WHEN
  new autoscaling.AutoScalingGroup(stack, 'ecs-ec2-asg', {
    instanceType: new ec2.InstanceType('t2.micro'),
    machineImage: new ec2.AmazonLinuxImage(),
    minCapacity: 1,
    maxCapacity: 1,
    desiredCapacity: 1,
    vpc,
    allowAllOutbound: false,
    associatePublicIpAddress: false,
    vpcSubnets: { subnetType: ec2.SubnetType.PRIVATE_WITH_EGRESS },
  });

  // THEN
  Template.fromStack(stack).hasResourceProperties('AWS::AutoScaling::AutoScalingGroup', {
    VPCZoneIdentifier: {
      'Fn::Split': [',', { 'Fn::ImportValue': 'myPrivateSubnetIds' }],
    },
  });
});

function mockSecurityGroup(stack: cdk.Stack) {
  return ec2.SecurityGroup.fromSecurityGroupId(stack, 'MySG', 'most-secure');
}

function getTestStack(): cdk.Stack {
  return new cdk.Stack(undefined, 'TestStack', { env: { account: '1234', region: 'us-east-1' } });
}