pytest-serverless

pytest-serverless

Automatically mocks resources defined in serverless.yml file using moto and uses them in pytest.

This way you can focus on writing tests rather than defining enormous list of fixtures.

master	PyPI	Python	pytest	Licence
			6.2

Pre installation requirements

• serverless installed
• pytest installed

Installation

pip install pytest-serverless

Usage

Assuming your serverless.yml file looks like:

service: my-microservice
resources:
 Resources:
   TableA:
     Type: 'AWS::DynamoDB::Table'
     DeletionPolicy: Delete
     Properties:
       TableName: ${self:service}.my-table
       AttributeDefinitions:
         - AttributeName: id
           AttributeType: S
         - AttributeName: company_id
           AttributeType: S
       KeySchema:
         - AttributeName: id
           KeyType: HASH
       GlobalSecondaryIndexes:
         - IndexName: company_id
           KeySchema:
             - AttributeName: company_id
               KeyType: HASH
           Projection:
             ProjectionType: ALL
           ProvisionedThroughput:
             ReadCapacityUnits: 10
             WriteCapacityUnits: 30
       ProvisionedThroughput:
         ReadCapacityUnits: 10
         WriteCapacityUnits: 30

Just mark your test with @pytest.mark.usefixtures("serverless") and pytest-serverless will automatically create my-microservice.my-table dynamodb table.

import boto3
import pytest


@pytest.mark.usefixtures("serverless")
def test():
    table = boto3.resource("dynamodb").Table("my-microservice.my-table")
    count_of_items = len(table.scan()["Items"])
    assert count_of_items == 0

You can use a custom serverless file path setting the envionmnet variable SERVERLESS_FILE_PATH.

$ export SERVERLESS_FILE_PATH=/path/to/serverless.yml

You can use choose both sls or serverless command to run, settings the environment variable SERVERLESS_COMMAND. It will only accpets sls or serverless values.

$ export SERVERLESS_COMMAND=sls

Supported resources

AWS::DynamoDB::Table

AWS::SQS::Queue

AWS::SNS::Topic

AWS::S3::Bucket

AWS::KMS::Key