AWS CDK Anwendungen testen

$ mkdir state-machine && cd state-machine
cdk init --language=typescript
npm install --save-dev jest @types/jest

Erstellen Sie ein Verzeichnis für Ihre Tests.

$ mkdir test

Bearbeiten Sie die Projektepackage.json, um NPM mitzuteilen, wie Jest ausgeführt werden soll, und um Jest mitzuteilen, welche Arten von Dateien gesammelt werden sollen. Die erforderlichen Änderungen lauten wie folgt.

Diese Änderungen werden in der folgenden Übersicht dargestellt. Platzieren Sie den neuen Text an der unter angegebenen Stellepackage.json. Die Platzhalter „...“ stehen für vorhandene Teile der Datei, die nicht geändert werden sollten.

{
  ...
  "scripts": {
    ...
    "test": "jest"
  },
  "devDependencies": {
    ...
    "@types/jest": "^24.0.18",
    "jest": "^24.9.0"
  },
  "jest": {
    "moduleFileExtensions": ["js"]
  }
}

$ mkdir state-machine && cd state-machine
$ cdk init --language=javascript
$ npm install --save-dev jest

Erstellen Sie ein Verzeichnis für Ihre Tests.

$ mkdir test

Bearbeiten Sie die Projektepackage.json, um NPM mitzuteilen, wie Jest ausgeführt werden soll, und um Jest mitzuteilen, welche Arten von Dateien gesammelt werden sollen. Die erforderlichen Änderungen lauten wie folgt.

Diese Änderungen werden in der folgenden Übersicht dargestellt. Platzieren Sie den neuen Text an der unter angegebenen Stellepackage.json. Die Platzhalter „...“ stehen für vorhandene Teile der Datei, die nicht geändert werden sollten.

{
  ...
  "scripts": {
    ...
    "test": "jest"
  },
  "devDependencies": {
    ...
    "jest": "^24.9.0"
  },
  "jest": {
    "moduleFileExtensions": ["js"]
  }
}

$ mkdir state-machine && cd state-machine
$ cdk init --language=python
$ source .venv/bin/activate # On Windows, run '.\venv\Scripts\activate' instead
$ python -m pip install -r requirements.txt
$ python -m pip install -r requirements-dev.txt

$ mkdir state-machine && cd-state-machine
$ cdk init --language=java

Öffnen Sie das Projekt in Ihrer bevorzugten Java-IDE. (Verwenden Sie in Eclipse „Datei“ > „Importieren“ > „Bestehende Maven-Projekte“.)

$ mkdir state-machine && cd-state-machine
$ cdk init --language=csharp

src\StateMachine.slnIn Visual Studio öffnen.

Klicken Sie im Projektmappen-Explorer mit der rechten Maustaste auf die Lösung und wählen Sie Hinzufügen > Neues Projekt. Suchen Sie nach MSTest C# und fügen Sie ein MSTest Testprojekt für C# hinzu. (Der Standardname TestProject1 ist in Ordnung.)

Klicken Sie mit der rechten MaustasteTestProject1, wählen Sie Hinzufügen > Projektreferenz und fügen Sie das StateMachine Projekt als Referenz hinzu.

Fügen Sie den folgenden Code ein: lib/state-machine-stack.ts

import * as cdk from "aws-cdk-lib";
import * as sns from "aws-cdk-lib/aws-sns";
import * as sns_subscriptions from "aws-cdk-lib/aws-sns-subscriptions";
import * as lambda from "aws-cdk-lib/aws-lambda";
import * as sfn from "aws-cdk-lib/aws-stepfunctions";
import { Construct } from "constructs";

export interface StateMachineStackProps extends cdk.StackProps {
  readonly topics: sns.Topic[];
}

export class StateMachineStack extends cdk.Stack {
  constructor(scope: Construct, id: string, props: StateMachineStackProps) {
    super(scope, id, props);

    // In the future this state machine will do some work...
    const stateMachine = new sfn.StateMachine(this, "StateMachine", {
      definition: new sfn.Pass(this, "StartState"),
    });

    // This Lambda function starts the state machine.
    const func = new lambda.Function(this, "LambdaFunction", {
      runtime: lambda.Runtime.NODEJS_18_X,
      handler: "handler",
      code: lambda.Code.fromAsset("./start-state-machine"),
      environment: {
        STATE_MACHINE_ARN: stateMachine.stateMachineArn,
      },
    });
    stateMachine.grantStartExecution(func);

    const subscription = new sns_subscriptions.LambdaSubscription(func);
    for (const topic of props.topics) {
      topic.addSubscription(subscription);
    }
  }
}

Geben Sie den folgenden Code einlib/state-machine-stack.js:

const cdk = require("aws-cdk-lib");
const sns = require("aws-cdk-lib/aws-sns");
const sns_subscriptions = require("aws-cdk-lib/aws-sns-subscriptions");
const lambda = require("aws-cdk-lib/aws-lambda");
const sfn = require("aws-cdk-lib/aws-stepfunctions");

class StateMachineStack extends cdk.Stack {
  constructor(scope, id, props) {
    super(scope, id, props);

    // In the future this state machine will do some work...
    const stateMachine = new sfn.StateMachine(this, "StateMachine", {
      definition: new sfn.Pass(this, "StartState"),
    });

    // This Lambda function starts the state machine.
    const func = new lambda.Function(this, "LambdaFunction", {
      runtime: lambda.Runtime.NODEJS_18_X,
      handler: "handler",
      code: lambda.Code.fromAsset("./start-state-machine"),
      environment: {
        STATE_MACHINE_ARN: stateMachine.stateMachineArn,
      },
    });
    stateMachine.grantStartExecution(func);

    const subscription = new sns_subscriptions.LambdaSubscription(func);
    for (const topic of props.topics) {
      topic.addSubscription(subscription);
    }
  }
}

module.exports = { StateMachineStack }

Geben Sie den folgenden Code einstate_machine/state_machine_stack.py:

from typing import List

import aws_cdk.aws_lambda as lambda_
import aws_cdk.aws_sns as sns
import aws_cdk.aws_sns_subscriptions as sns_subscriptions
import aws_cdk.aws_stepfunctions as sfn
import aws_cdk as cdk

class StateMachineStack(cdk.Stack):
    def __init__(
        self,
        scope: cdk.Construct,
        construct_id: str,
        *,
        topics: List[sns.Topic],
        **kwargs
    ) -> None:
        super().__init__(scope, construct_id, **kwargs)

        # In the future this state machine will do some work...
        state_machine = sfn.StateMachine(
            self, "StateMachine", definition=sfn.Pass(self, "StartState")
        )

        # This Lambda function starts the state machine.
        func = lambda_.Function(
            self,
            "LambdaFunction",
            runtime=lambda_.Runtime.NODEJS_18_X,
            handler="handler",
            code=lambda_.Code.from_asset("./start-state-machine"),
            environment={
                "STATE_MACHINE_ARN": state_machine.state_machine_arn,
            },
        )
        state_machine.grant_start_execution(func)

        subscription = sns_subscriptions.LambdaSubscription(func)
        for topic in topics:
            topic.add_subscription(subscription)

package software.amazon.samples.awscdkassertionssamples;

import software.constructs.Construct;
import software.amazon.awscdk.Stack;
import software.amazon.awscdk.StackProps;
import software.amazon.awscdk.services.lambda.Code;
import software.amazon.awscdk.services.lambda.Function;
import software.amazon.awscdk.services.lambda.Runtime;
import software.amazon.awscdk.services.sns.ITopicSubscription;
import software.amazon.awscdk.services.sns.Topic;
import software.amazon.awscdk.services.sns.subscriptions.LambdaSubscription;
import software.amazon.awscdk.services.stepfunctions.Pass;
import software.amazon.awscdk.services.stepfunctions.StateMachine;

import java.util.Collections;
import java.util.List;

public class StateMachineStack extends Stack {
    public StateMachineStack(final Construct scope, final String id, final List<Topic> topics) {
        this(scope, id, null, topics);
    }

    public StateMachineStack(final Construct scope, final String id, final StackProps props, final List<Topic> topics) {
        super(scope, id, props);

        // In the future this state machine will do some work...
        final StateMachine stateMachine = StateMachine.Builder.create(this, "StateMachine")
                .definition(new Pass(this, "StartState"))
                .build();

        // This Lambda function starts the state machine.
        final Function func = Function.Builder.create(this, "LambdaFunction")
                .runtime(Runtime.NODEJS_18_X)
                .handler("handler")
                .code(Code.fromAsset("./start-state-machine"))
                .environment(Collections.singletonMap("STATE_MACHINE_ARN", stateMachine.getStateMachineArn()))
                .build();
        stateMachine.grantStartExecution(func);

        final ITopicSubscription subscription = new LambdaSubscription(func);
        for (final Topic topic : topics) {
            topic.addSubscription(subscription);
        }
    }
}

using Amazon.CDK;
using Amazon.CDK.AWS.Lambda;
using Amazon.CDK.AWS.StepFunctions;
using Amazon.CDK.AWS.SNS;
using Amazon.CDK.AWS.SNS.Subscriptions;
using Constructs;

using System.Collections.Generic;

namespace AwsCdkAssertionSamples
{
    public class StateMachineStackProps : StackProps
    {
        public Topic[] Topics;
    }

    public class StateMachineStack : Stack
    {

        internal StateMachineStack(Construct scope, string id, StateMachineStackProps props = null) : base(scope, id, props)
        {
            // In the future this state machine will do some work...
            var stateMachine = new StateMachine(this, "StateMachine", new StateMachineProps
            {
                Definition = new Pass(this, "StartState")
            });

            // This Lambda function starts the state machine.
            var func = new Function(this, "LambdaFunction", new FunctionProps
            {
                Runtime = Runtime.NODEJS_18_X,
                Handler = "handler",
                Code = Code.FromAsset("./start-state-machine"),
                Environment = new Dictionary<string, string>
                {
                    { "STATE_MACHINE_ARN", stateMachine.StateMachineArn }
                }
            });
            stateMachine.GrantStartExecution(func);
           
            foreach (Topic topic in props?.Topics ?? new Topic[0])
            {
                var subscription = new LambdaSubscription(func);
            }

        }
    }
}

In bin/state-machine.ts:

#!/usr/bin/env node
import * as cdk from "aws-cdk-lib";

const app = new cdk.App();

// Stacks are intentionally not created here -- this application isn't meant to
// be deployed.

In bin/state-machine.js:

#!/usr/bin/env node
const cdk = require("aws-cdk-lib");

const app = new cdk.App();

// Stacks are intentionally not created here -- this application isn't meant to
// be deployed.

In app.py:

#!/usr/bin/env python3
import os

import aws_cdk  as cdk

app = cdk.App()

# Stacks are intentionally not created here -- this application isn't meant to
# be deployed.

app.synth()

package software.amazon.samples.awscdkassertionssamples;

import software.amazon.awscdk.App;

public class SampleApp {
    public static void main(final String[] args) {
        App app = new App();

        // Stacks are intentionally not created here -- this application isn't meant to be deployed.

        app.synth();
    }
}

using Amazon.CDK;

namespace AwsCdkAssertionSamples
{
    sealed class Program
    {
        public static void Main(string[] args)
        {
            var app = new App();

            // Stacks are intentionally not created here -- this application isn't meant to be deployed.

            app.Synth();
        }
    }
}

$ tsc && npm test

$ npm test

$ python -m pytest

$ mvn compile && mvn test

Erstellen Sie Ihre Lösung (F6), um die Tests zu ermitteln, und führen Sie dann die Tests aus (Test > Alle Tests ausführen). Um auszuwählen, welche Tests ausgeführt werden sollen, öffnen Sie den Test Explorer (Test > Test Explorer).

Oder:

$ dotnet test src

import { Capture, Match, Template } from "aws-cdk-lib/assertions";
import * as cdk from "aws-cdk-lib";
import * as sns from "aws-cdk-lib/aws-sns";
import { StateMachineStack } from "../lib/state-machine-stack";

describe("StateMachineStack", () => {
  test("synthesizes the way we expect", () => {
    const app = new cdk.App();

    // Since the StateMachineStack consumes resources from a separate stack
    // (cross-stack references), we create a stack for our SNS topics to live
    // in here. These topics can then be passed to the StateMachineStack later,
    // creating a cross-stack reference.
    const topicsStack = new cdk.Stack(app, "TopicsStack");

    // Create the topic the stack we're testing will reference.
    const topics = [new sns.Topic(topicsStack, "Topic1", {})];

    // Create the StateMachineStack.
    const stateMachineStack = new StateMachineStack(app, "StateMachineStack", {
      topics: topics, // Cross-stack reference
    });

    // Prepare the stack for assertions.
    const template = Template.fromStack(stateMachineStack);


}

const { Capture, Match, Template } = require("aws-cdk-lib/assertions");
const cdk = require("aws-cdk-lib");
const sns = require("aws-cdk-lib/aws-sns");
const { StateMachineStack } = require("../lib/state-machine-stack");

describe("StateMachineStack", () => {
  test("synthesizes the way we expect", () => {
    const app = new cdk.App();

    // Since the StateMachineStack consumes resources from a separate stack
    // (cross-stack references), we create a stack for our SNS topics to live
    // in here. These topics can then be passed to the StateMachineStack later,
    // creating a cross-stack reference.
    const topicsStack = new cdk.Stack(app, "TopicsStack");

    // Create the topic the stack we're testing will reference.
    const topics = [new sns.Topic(topicsStack, "Topic1", {})];

    // Create the StateMachineStack.
    const StateMachineStack = new StateMachineStack(app, "StateMachineStack", {
      topics: topics, // Cross-stack reference
    });

    // Prepare the stack for assertions.
    const template = Template.fromStack(stateMachineStack);

from aws_cdk import aws_sns as sns
import aws_cdk as cdk
from aws_cdk.assertions import Template

from app.state_machine_stack import StateMachineStack

def test_synthesizes_properly():
    app = cdk.App()

    # Since the StateMachineStack consumes resources from a separate stack
    # (cross-stack references), we create a stack for our SNS topics to live
    # in here. These topics can then be passed to the StateMachineStack later,
    # creating a cross-stack reference.
    topics_stack = cdk.Stack(app, "TopicsStack")

    # Create the topic the stack we're testing will reference.
    topics = [sns.Topic(topics_stack, "Topic1")]

    # Create the StateMachineStack.
    state_machine_stack = StateMachineStack(
        app, "StateMachineStack", topics=topics  # Cross-stack reference
    )

    # Prepare the stack for assertions.
    template = Template.from_stack(state_machine_stack)

package software.amazon.samples.awscdkassertionssamples;

import org.junit.jupiter.api.Test;
import software.amazon.awscdk.assertions.Capture;
import software.amazon.awscdk.assertions.Match;
import software.amazon.awscdk.assertions.Template;
import software.amazon.awscdk.App;
import software.amazon.awscdk.Stack;
import software.amazon.awscdk.services.sns.Topic;

import java.util.*;

import static org.assertj.core.api.Assertions.assertThat;

public class StateMachineStackTest {
    @Test
    public void testSynthesizesProperly() {
        final App app = new App();

        // Since the StateMachineStack consumes resources from a separate stack (cross-stack references), we create a stack
        // for our SNS topics to live in here. These topics can then be passed to the StateMachineStack later, creating a
        // cross-stack reference.
        final Stack topicsStack = new Stack(app, "TopicsStack");

        // Create the topic the stack we're testing will reference.
        final List<Topic> topics = Collections.singletonList(Topic.Builder.create(topicsStack, "Topic1").build());

        // Create the StateMachineStack.
        final StateMachineStack stateMachineStack = new StateMachineStack(
                app,
                "StateMachineStack",
                topics // Cross-stack reference
        );

        // Prepare the stack for assertions.
        final Template template = Template.fromStack(stateMachineStack)

using Microsoft.VisualStudio.TestTools.UnitTesting;

using Amazon.CDK;
using Amazon.CDK.AWS.SNS;
using Amazon.CDK.Assertions;
using AwsCdkAssertionSamples;

using ObjectDict = System.Collections.Generic.Dictionary<string, object>;
using StringDict = System.Collections.Generic.Dictionary<string, string>;

namespace TestProject1
{
    [TestClass]
    public class StateMachineStackTest
    {
        [TestMethod]
        public void TestMethod1()
        {
            var app = new App();

            // Since the StateMachineStack consumes resources from a separate stack (cross-stack references), we create a stack
            // for our SNS topics to live in here. These topics can then be passed to the StateMachineStack later, creating a
            // cross-stack reference.
            var topicsStack = new Stack(app, "TopicsStack");

            // Create the topic the stack we're testing will reference.
            var topics = new Topic[] { new Topic(topicsStack, "Topic1") };

            // Create the StateMachineStack.
            var StateMachineStack = new StateMachineStack(app, "StateMachineStack", new StateMachineStackProps
            {
                Topics = topics
            });

            // Prepare the stack for assertions.
            var template = Template.FromStack(stateMachineStack);
            
            // test will go here
        }
    }
}

    // Assert it creates the function with the correct properties...
    template.hasResourceProperties("AWS::Lambda::Function", {
      Handler: "handler",
      Runtime: "nodejs14.x",
    });

    // Creates the subscription...
    template.resourceCountIs("AWS::SNS::Subscription", 1);

    // Assert it creates the function with the correct properties...
    template.hasResourceProperties("AWS::Lambda::Function", {
      Handler: "handler",
      Runtime: "nodejs14.x",
    });

    // Creates the subscription...
    template.resourceCountIs("AWS::SNS::Subscription", 1);

# Assert that we have created the function with the correct properties
    template.has_resource_properties(
        "AWS::Lambda::Function",
        {
            "Handler": "handler",
            "Runtime": "nodejs14.x",
        },
    )

    # Assert that we have created a subscription
    template.resource_count_is("AWS::SNS::Subscription", 1)

        // Assert it creates the function with the correct properties...
        template.hasResourceProperties("AWS::Lambda::Function", Map.of(
                "Handler", "handler",
                "Runtime", "nodejs14.x"
        ));
          
         // Creates the subscription...
        template.resourceCountIs("AWS::SNS::Subscription", 1);

            // Prepare the stack for assertions.
            var template = Template.FromStack(stateMachineStack);

            // Assert it creates the function with the correct properties...
            template.HasResourceProperties("AWS::Lambda::Function", new StringDict {
                { "Handler", "handler"},
                { "Runtime", "nodejs14x" }
            });

            // Creates the subscription...
            template.ResourceCountIs("AWS::SNS::Subscription", 1);

    // Fully assert on the state machine's IAM role with matchers.
    template.hasResourceProperties(
      "AWS::IAM::Role",
      Match.objectEquals({
        AssumeRolePolicyDocument: {
          Version: "2012-10-17",
          Statement: [
            {
              Action: "sts:AssumeRole",
              Effect: "Allow",
              Principal: {
                Service: {
                  "Fn::Join": [
                    "",
                    ["states.", Match.anyValue(), ".amazonaws.com"],
                  ],
                },
              },
            },
          ],
        },
      })
    );

    // Fully assert on the state machine's IAM role with matchers.
    template.hasResourceProperties(
      "AWS::IAM::Role",
      Match.objectEquals({
        AssumeRolePolicyDocument: {
          Version: "2012-10-17",
          Statement: [
            {
              Action: "sts:AssumeRole",
              Effect: "Allow",
              Principal: {
                Service: {
                  "Fn::Join": [
                    "",
                    ["states.", Match.anyValue(), ".amazonaws.com"],
                  ],
                },
              },
            },
          ],
        },
      })
    );

from aws_cdk.assertions import Match

    # Fully assert on the state machine's IAM role with matchers.
    template.has_resource_properties(
        "AWS::IAM::Role",
        Match.object_equals(
            {
                "AssumeRolePolicyDocument": {
                    "Version": "2012-10-17",
                    "Statement": [
                        {
                            "Action": "sts:AssumeRole",
                            "Effect": "Allow",
                            "Principal": {
                                "Service": {
                                    "Fn::Join": [
                                        "",
                                        [
                                            "states.",
                                            Match.any_value(),
                                            ".amazonaws.com",
                                        ],
                                    ],
                                },
                            },
                        },
                    ],
                },
            }
        ),
    )

        // Fully assert on the state machine's IAM role with matchers.
        template.hasResourceProperties("AWS::IAM::Role", Match.objectEquals(
                Collections.singletonMap("AssumeRolePolicyDocument", Map.of(
                        "Version", "2012-10-17",
                        "Statement", Collections.singletonList(Map.of(
                                "Action", "sts:AssumeRole",
                                "Effect", "Allow",
                                "Principal", Collections.singletonMap(
                                        "Service", Collections.singletonMap(
                                                "Fn::Join", Arrays.asList(
                                                        "",
                                                        Arrays.asList("states.", Match.anyValue(), ".amazonaws.com")
                                                )
                                        )
                                )
                        ))
                ))
        ));

            // Fully assert on the state machine's IAM role with matchers.
            template.HasResource("AWS::IAM::Role", Match.ObjectEquals(new ObjectDict
            {
                { "AssumeRolePolicyDocument", new ObjectDict
                    {
                        { "Version", "2012-10-17" },
                        { "Action", "sts:AssumeRole" },
                        { "Principal", new ObjectDict
                            {
                                { "Version", "2012-10-17" },
                                { "Statement", new object[]
                                    {
                                        new ObjectDict {
                                            { "Action", "sts:AssumeRole" },
                                            { "Effect", "Allow" },
                                            { "Principal", new ObjectDict
                                                {
                                                    { "Service", new ObjectDict
                                                        {
                                                            { "", new object[]
                                                                { "states", Match.AnyValue(), ".amazonaws.com" }
                                                            }
                                                        }
                                                    }
                                                }
                                            }
                                        }
                                    }
                                }
                            }
                        }
                    }
                }
            }));

    // Assert on the state machine's definition with the Match.serializedJson()
    // matcher.
    template.hasResourceProperties("AWS::StepFunctions::StateMachine", {
      DefinitionString: Match.serializedJson(
        // Match.objectEquals() is used implicitly, but we use it explicitly
        // here for extra clarity.
        Match.objectEquals({
          StartAt: "StartState",
          States: {
            StartState: {
              Type: "Pass",
              End: true,
              // Make sure this state doesn't provide a next state -- we can't
              // provide both Next and set End to true.
              Next: Match.absent(),
            },
          },
        })
      ),
    });

    // Assert on the state machine's definition with the Match.serializedJson()
    // matcher.
    template.hasResourceProperties("AWS::StepFunctions::StateMachine", {
      DefinitionString: Match.serializedJson(
        // Match.objectEquals() is used implicitly, but we use it explicitly
        // here for extra clarity.
        Match.objectEquals({
          StartAt: "StartState",
          States: {
            StartState: {
              Type: "Pass",
              End: true,
              // Make sure this state doesn't provide a next state -- we can't
              // provide both Next and set End to true.
              Next: Match.absent(),
            },
          },
        })
      ),
    });

    # Assert on the state machine's definition with the serialized_json matcher.
    template.has_resource_properties(
        "AWS::StepFunctions::StateMachine",
        {
            "DefinitionString": Match.serialized_json(
                # Match.object_equals() is the default, but specify it here for clarity
                Match.object_equals(
                    {
                        "StartAt": "StartState",
                        "States": {
                            "StartState": {
                                "Type": "Pass",
                                "End": True,
                                # Make sure this state doesn't provide a next state --
                                # we can't provide both Next and set End to true.
                                "Next": Match.absent(),
                            },
                        },
                    }
                )
            ),
        },
    )

        // Assert on the state machine's definition with the Match.serializedJson() matcher.
        template.hasResourceProperties("AWS::StepFunctions::StateMachine", Collections.singletonMap(
                "DefinitionString", Match.serializedJson(
                        // Match.objectEquals() is used implicitly, but we use it explicitly here for extra clarity.
                        Match.objectEquals(Map.of(
                                "StartAt", "StartState",
                                "States", Collections.singletonMap(
                                        "StartState", Map.of(
                                                "Type", "Pass",
                                                "End", true,
                                                // Make sure this state doesn't provide a next state -- we can't provide
                                                // both Next and set End to true.
                                                "Next", Match.absent()
                                        )
                                )
                        ))
                )
        ));

            // Assert on the state machine's definition with the Match.serializedJson() matcher
            template.HasResourceProperties("AWS::StepFunctions::StateMachine", new ObjectDict
            {
                { "DefinitionString", Match.SerializedJson(
                    // Match.objectEquals() is used implicitly, but we use it explicitly here for extra clarity.
                    Match.ObjectEquals(new ObjectDict {
                        { "StartAt", "StartState" },
                        { "States", new ObjectDict
                        {
                            { "StartState", new ObjectDict {
                                { "Type", "Pass" },
                                { "End", "True" },
                                // Make sure this state doesn't provide a next state -- we can't provide
                                // both Next and set End to true.
                                { "Next", Match.Absent() }
                            }}
                        }}
                    })    
                )}});

    // Capture some data from the state machine's definition.
    const startAtCapture = new Capture();
    const statesCapture = new Capture();
    template.hasResourceProperties("AWS::StepFunctions::StateMachine", {
      DefinitionString: Match.serializedJson(
        Match.objectLike({
          StartAt: startAtCapture,
          States: statesCapture,
        })
      ),
    });

    // Assert that the start state starts with "Start".
    expect(startAtCapture.asString()).toEqual(expect.stringMatching(/^Start/));

    // Assert that the start state actually exists in the states object of the
    // state machine definition.
    expect(statesCapture.asObject()).toHaveProperty(startAtCapture.asString());

    // Capture some data from the state machine's definition.
    const startAtCapture = new Capture();
    const statesCapture = new Capture();
    template.hasResourceProperties("AWS::StepFunctions::StateMachine", {
      DefinitionString: Match.serializedJson(
        Match.objectLike({
          StartAt: startAtCapture,
          States: statesCapture,
        })
      ),
    });

    // Assert that the start state starts with "Start".
    expect(startAtCapture.asString()).toEqual(expect.stringMatching(/^Start/));

    // Assert that the start state actually exists in the states object of the
    // state machine definition.
    expect(statesCapture.asObject()).toHaveProperty(startAtCapture.asString());

import re

    from aws_cdk.assertions import Capture

    # ...

    # Capture some data from the state machine's definition.
    start_at_capture = Capture()
    states_capture = Capture()
    template.has_resource_properties(
        "AWS::StepFunctions::StateMachine",
        {
            "DefinitionString": Match.serialized_json(
                Match.object_like(
                    {
                        "StartAt": start_at_capture,
                        "States": states_capture,
                    }
                )
            ),
        },
    )

    # Assert that the start state starts with "Start".
    assert re.match("^Start", start_at_capture.as_string())

    # Assert that the start state actually exists in the states object of the
    # state machine definition.
    assert start_at_capture.as_string() in states_capture.as_object()

        // Capture some data from the state machine's definition.
        final Capture startAtCapture = new Capture();
        final Capture statesCapture = new Capture();
        template.hasResourceProperties("AWS::StepFunctions::StateMachine", Collections.singletonMap(
                "DefinitionString", Match.serializedJson(
                        Match.objectLike(Map.of(
                                "StartAt", startAtCapture,
                                "States", statesCapture
                        ))
                )
        ));

        // Assert that the start state starts with "Start".
        assertThat(startAtCapture.asString()).matches("^Start.+");

        // Assert that the start state actually exists in the states object of the state machine definition.
        assertThat(statesCapture.asObject()).containsKey(startAtCapture.asString());

            // Capture some data from the state machine's definition.
            var startAtCapture = new Capture();
            var statesCapture = new Capture();
            template.HasResourceProperties("AWS::StepFunctions::StateMachine", new ObjectDict
            {
                { "DefinitionString", Match.SerializedJson(
                    new ObjectDict
                    {
                        { "StartAt", startAtCapture },
                        { "States", statesCapture }
                    }
                )}
            });

            Assert.IsTrue(startAtCapture.ToString().StartsWith("Start"));
            Assert.IsTrue(statesCapture.AsObject().ContainsKey(startAtCapture.ToString()));

export class DeadLetterQueue extends sqs.Queue {
  public readonly messagesInQueueAlarm: cloudwatch.IAlarm;

  constructor(scope: Construct, id: string) {
    super(scope, id);

    // Add the alarm
    this.messagesInQueueAlarm = new cloudwatch.Alarm(this, 'Alarm', {
      alarmDescription: 'There are messages in the Dead Letter Queue',
      evaluationPeriods: 1,
      threshold: 1,
      metric: this.metricApproximateNumberOfMessagesVisible(),
    });
  }
}

class DeadLetterQueue extends sqs.Queue {
  
  constructor(scope, id) {
    super(scope, id);

    // Add the alarm
    this.messagesInQueueAlarm = new cloudwatch.Alarm(this, 'Alarm', {
      alarmDescription: 'There are messages in the Dead Letter Queue',
      evaluationPeriods: 1,
      threshold: 1,
      metric: this.metricApproximateNumberOfMessagesVisible(),
    });
  }
}

module.exports = { DeadLetterQueue }

class DeadLetterQueue(sqs.Queue):
    def __init__(self, scope: Construct, id: str):
        super().__init__(scope, id)

        self.messages_in_queue_alarm = cloudwatch.Alarm(
            self,
            "Alarm",
            alarm_description="There are messages in the Dead Letter Queue.",
            evaluation_periods=1,
            threshold=1,
            metric=self.metric_approximate_number_of_messages_visible(),
        )

public class DeadLetterQueue extends Queue {
    private final IAlarm messagesInQueueAlarm;

    public DeadLetterQueue(@NotNull Construct scope, @NotNull String id) {
        super(scope, id);

        this.messagesInQueueAlarm = Alarm.Builder.create(this, "Alarm")
                .alarmDescription("There are messages in the Dead Letter Queue.")
                .evaluationPeriods(1)
                .threshold(1)
                .metric(this.metricApproximateNumberOfMessagesVisible())
                .build();
    }

    public IAlarm getMessagesInQueueAlarm() {
        return messagesInQueueAlarm;
    }
}

namespace AwsCdkAssertionSamples
{
    public class DeadLetterQueue : Queue
    {
        public IAlarm messagesInQueueAlarm;

        public DeadLetterQueue(Construct scope, string id) : base(scope, id)
        {
            messagesInQueueAlarm = new Alarm(this, "Alarm", new AlarmProps
            { 
                AlarmDescription = "There are messages in the Dead Letter Queue.",
                EvaluationPeriods = 1,
                Threshold = 1,
                Metric = this.MetricApproximateNumberOfMessagesVisible()
            });
        }
    }
}

import { Match, Template } from "aws-cdk-lib/assertions";
import * as cdk from "aws-cdk-lib";
import { DeadLetterQueue } from "../lib/dead-letter-queue";

describe("DeadLetterQueue", () => {
  test("matches the snapshot", () => {
    const stack = new cdk.Stack();
    new DeadLetterQueue(stack, "DeadLetterQueue");

    const template = Template.fromStack(stack);
    expect(template.toJSON()).toMatchSnapshot();
  });
});

const { Match, Template } = require("aws-cdk-lib/assertions");
const cdk = require("aws-cdk-lib");
const { DeadLetterQueue } = require("../lib/dead-letter-queue");

describe("DeadLetterQueue", () => {
  test("matches the snapshot", () => {
    const stack = new cdk.Stack();
    new DeadLetterQueue(stack, "DeadLetterQueue");

    const template = Template.fromStack(stack);
    expect(template.toJSON()).toMatchSnapshot();
  });
});

import aws_cdk_lib as cdk
from aws_cdk_lib.assertions import Match, Template

from app.dead_letter_queue import DeadLetterQueue

def snapshot_test():
    stack = cdk.Stack()
    DeadLetterQueue(stack, "DeadLetterQueue")

    template = Template.from_stack(stack)
    assert template.to_json() == snapshot
          

package software.amazon.samples.awscdkassertionssamples;

import org.junit.jupiter.api.Test;
import au.com.origin.snapshots.Expect;
import software.amazon.awscdk.assertions.Match;
import software.amazon.awscdk.assertions.Template;
import software.amazon.awscdk.Stack;

import java.util.Collections;
import java.util.Map;

public class DeadLetterQueueTest {
    @Test
    public void snapshotTest() {
        final Stack stack = new Stack();
        new DeadLetterQueue(stack, "DeadLetterQueue");

        final Template template = Template.fromStack(stack);
        expect.toMatchSnapshot(template.toJSON());
    }
}

using Microsoft.VisualStudio.TestTools.UnitTesting;

using Amazon.CDK;
using Amazon.CDK.Assertions;
using AwsCdkAssertionSamples;

using ObjectDict = System.Collections.Generic.Dictionary<string, object>;
using StringDict = System.Collections.Generic.Dictionary<string, string>;

namespace TestProject1
{
    [TestClass]
    public class StateMachineStackTest

    [TestClass]
    public class DeadLetterQueueTest
    {
    [TestMethod]
        public void SnapshotTest()
        {
            var stack = new Stack();
            new DeadLetterQueue(stack, "DeadLetterQueue");

            var template = Template.FromStack(stack);

            return Verifier.Verify(template.ToJSON());
        }
    }
}