Tips for testing SSM's GetParameter with aws-sdk-client-mock in typescript

I'm looking to create a test case for the SSM GetParameterCommand request in TypeScript. Here is my code snippet:

const region = "us-east-1"
const awsSSMClient = new SSMClient({ region })

export async function fetchParam(parameterName: string, decrypt: boolean): Promise<string> {
    const paramconfig = {
        Name: parameterName,
        WithDecryption: decrypt
    }

    const command = new GetParameterCommand(input)
    const parameter: any = await awsSSMClient.send(command)

    return parameter.Parameter.Value
}

Is it possible to utilize aws-sdk-client-mock for this? If not, could someone provide an example?

Thanks

typescriptaws-sdk-jsaws-ssmaws-sdk-nodejsaws-sdk-mock

Answer №1

Absolutely, you have the option to utilize aws-sdk-client-mock for this specific scenario. To implement the code snippet you provided, your test case will resemble something like the following:

jest.mock("aws-sdk-client-mock-jest");
const {DynamoDBClient, GetItemCommand} = require("@aws-sdk/client-dynamodb");
const {mockClient} = require("aws-sdk-client-mock");

test("Item is fetched", async () => {
    const dynamoMock = mockClient(DynamoDBClient);
    dynamoMock.on(GetItemCommand).resolves({
            Item: {
            Info: "Your desired information"
        }
    });
    const data = await fetchItem();
    
    // Perform necessary assertions
});

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