stub

A test double for http calls

🧐 Motivation

Often times in a microservice architecture, a service will –sadly– depend on many others. When that happens, if the service is not ready to be run without its dependencies, a CI/CD pipeline can quickly become hard to maintain. Not only the service dependencies are needed to run the SUT, also their own dependencies. This ends up in a pipeline running tons of services from which the SUT needs, maybe, a single endpoint to work.

stub provides a way to easily mock those required endpoints and nothing else. Point your SUT dependencies against stub, create request expectations and test your logic controlling the execution flow.

👩‍💻 How to use

You first need to create an expectation. The expected http method is a must. The path and headers are optional, yet recommended. For every expectation, you also specify what you'd expect as status code, response and headers.

Say you're running stub on port 8080:

curl -XPUT http://localhost:8080/expectation -d '{
	"using_method": "get",
	"against_path": "/complete/path",
	"with_headers": {
		"x-correlation-id": ["abc0123"]
	},
	"returns_code": 200,
	"with_response": {
		"string": "value",
		"number": 24
	},
	"and_headers": {
		"x-correlation-id": ["abc0123"],
		"cache-control": ["no-store", "no-cache"]
	}
}'

Once the expectation is created, you can get the given response, status code and headers if the given method, path and headers match.

🧙‍♂️ How to run

Using plain go

The easiest way to run stub, specially when writing tests.

go run ./cmd/stub

Using docker

Run the docker image exposing the port 8080:

docker run --rm -p 8080:8080 thisiserico/stub:v1.0.3

🤷‍♀️ What's missing?

Some handy features are not yet implemented. Feel free to contribute on them!

• Delete previously created expectation
• Delete all previously created expectations
• Test different scenarios