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07-testing-infrastructure.md

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TESTING INFRASTRUCTURE

Introduction

Testing your AWS CDK infrastructure is a crucial step in ensuring that the resources you define behave as expected before deploying them to AWS. By writing tests, you can validate the structure of your stacks, the configuration of your resources, and their interactions. The AWS CDK provides a powerful assertions module that allows you to create unit tests for your infrastructure.

Example Tests

Here are some examples of how to test your AWS CDK infrastructure (and here the examples in code):

Purpose Code Example Explanation
Test DynamoDB Table Exists 

import aws_cdk as core
import aws_cdk.assertions as assertions

from api_lambda_dynamodb.components import ApiLambdaDynamodbStack


def test_dynamodb_table_exists():
app = core.App()
stack = ApiLambdaDynamodbStack(app, "api-lambda-dynamodb")
template = assertions.Template.from_stack(stack)


# Check that the DynamoDB table exists
template.resource_count_is("AWS::DynamoDB::Table", 1)
  </code></pre>
</td>
<td>Verifies that exactly one DynamoDB table is defined in the stack.</td>
Test Lambda Functions Exist 

import aws_cdk as core
import aws_cdk.assertions as assertions

from api_lambda_dynamodb.components import ApiLambdaDynamodbStack


def test_lambda_functions_exist():
app = core.App()
stack = ApiLambdaDynamodbStack(app, "api-lambda-dynamodb")
template = assertions.Template.from_stack(stack)


# Check that there are exactly 2 Lambda functions
template.resource_count_is("AWS::Lambda::Function", 2)
  </code></pre>
</td>
<td>Ensures that two Lambda functions are defined in the stack.</td>
Test API Gateway Exists 

import aws_cdk as core
import aws_cdk.assertions as assertions

from api_lambda_dynamodb.components import ApiLambdaDynamodbStack


def test_api_gateway_exists():
app = core.App()
stack = ApiLambdaDynamodbStack(app, "api-lambda-dynamodb")
template = assertions.Template.from_stack(stack)


# Check that the API Gateway RestApi exists
template.resource_count_is("AWS::ApiGateway::RestApi", 1)
  </code></pre>
</td>
<td>Verifies the presence of an API Gateway resource in the stack.</td>

These examples demonstrate basic tests for ensuring that essential resources like DynamoDB tables, Lambda functions, and API Gateways are correctly defined in your CDK stacks. By running these tests, you can catch errors early in the development process, before deploying your infrastructure to AWS.

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