SUT Mock

Mocks a system under test (SUT) to be used for load testing.

The mock will respond to each request with a status code 200 and log the request except for the cases listed below. Furthermore, it maintains a user session. All requests are written to files and can be retrieved via a REST endpoint.

Special Endpoints

Requests to the following endpoints return special responses and will not be logged:

• GET /_status: returns wil a 200 if the SUT Mock is up and running, without logging the request.
• POST /_restart: resets the Mock and restarts it. Formerly recorded requests will be deleted.
• GET /_logs: returns all request logs collected so far in the following format (corresponding to Apache Logs): sessionId - - [timestamp] "method path protocol" responseCode -

Logging & Limits

The SUT Mock buffers each request and writes it to a file asynchronously. In case the internal buffer is full, the requests will be dropped and the Mock will respond with a 500 status. The number of threads removing requests from the buffer and writing them to files can be configured.

Running SUT Mock

Using Docker

The best option to run the SUT Mock is to use the Docker container available:

docker run -d --rm --name sutmock -p 8080:80 continuityproject/sutmock

Using a Local Build

Alternatively, it can be built locally (see below) and started directly:

java -jar build/libs/sutmock.jar --port=8080

Run Parameters

Both options to run the SUT Mock accept the following parameters. Simply append them to the run commands shown above, e.g., ... --sutmock.writers=4

• --port: the port number to be used. Defaults to 80.
• --sutmock.buffersize: The maximum number of requests to be buffered. Defaults to 1024.
• --sutmock.writers: The number of writers removing the requests from the buffer. Defaults to half the number of available processors.
• --sutmock.file_prefix: The prefix for the load files. Defaults to logs/log_.

Build the SUT Mock

The SUT Mock is build using Gradle with the following command:

./gradlew build

Build a Docker container locally using the following command:

docker build . -t continuityproject/sutmock