testing-serverless-apps's Introduction

Example of how to run e2e and unit tests on serverless apps using LocalStack and Jest

Code samples of my video on testing serverless applications.

It uses Jest as test runner, LocalStack as a mock server for AWS Services, serverless framework to deploy apps on AWS and GitHub Actions as continuous integration platform.

Note that it uses ECMAScript Modules empowered by Node.js v20 without any bundlers (NICE).

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In the ./tests folder I put two examples: e2e and unit tests folder and there you can take a look on how to make those tests.
In ./src/factory.js you can take a look on how to configure the AWS SDK v3 to point it to localStack when in development mode.

Running

Pre reqs

Install Docker & Docker-compose
Install Node.js v20

Running

run docker-compose up -d localstack
restore node.js dependencies npm ci
run tests npm t or press F5 on VSCode.

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testing-serverless-apps's Issues

CredentialsProviderError: Could not load credentials from any providers

Ao clonar o projeto e tentar executar conforme o vídeo postado no YouTube, me deparei com o seguinte erro: CredentialsProviderError: Could not load credentials from any providers. Com isso, adicionei o seguinte código no arquivo factory, e funcionou normalmente.

Codigo:

if (isLocal) {
	const host = process.env.LOCALSTACK_HOST || "localhost";
	s3config.endpoint = `http://${host}:4566`;
+	s3config.credentials = {
+		accessKeyId: "test",
+		secretAccessKey: "test",
+	};
}

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