In our example, the handler references the global variables, and instantiates the resource classes to setup the connections to specific AWS resources. This approach enables us to mock and intercept all resources and calls during test. Also, pass the AWS resource global variables to these subsequent function calls. To facilitate unit test of the handler function, move as much of logic as possible to other functions that are then called by the Lambda hander entry point. When the handler exits or returns a response, it becomes available to process another event.
When the function is invoked, Lambda runs the handler method. The Lambda function handler is the method in the AWS Lambda function code that processes events. Self.table = (self.table_name) Build the Lambda Handler Self.table_name = lambda_dynamodb_resource For organization, we can put the resource and variables in a dictionary:ĭef _init_(self, lambda_dynamodb_resource): Additionally, we can retrieve any relevant environment variables in the global scope so that subsequent invocations of the Lambda function do not repeatedly need to retrieve them. The full code for the Lambda function is available in the GitHub repository as src/sample_lambda/app.py.Īs part of our Best practices for working AWS Lambda functions, we recommend initializing AWS service resource connections outside of the handler function and in the global scope. Define the AWS Service resources in the Lambda functionīefore writing our first unit test, let’s look at the Lambda function that contains the behavior we wish to test. We will mock the service integrations to Amazon DynamoDB and S3 to isolate and focus our tests on the Lambda function code, and not on the behavior of the AWS Services. In this blog, we will be writing tests to provide confidence that the logic written in the above AWS Lambda function behaves as we expect. Our testing goal is to determine if an isolated “unit” of code works as intended. The resulting text document is stored to Amazon S3.An Amazon DynamoDB table stores the contents of the documents and the users name, which are retrieved by the Lambda function.The endpoint invokes an AWS Lambda function that generates a document using the customer identifier and the document type provided.
A document type and customer identifier are provided in this API call.
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