This package provides a way to test the reducers in JSON Event Sourcing. You give it a test directory in which you create the subdirectories commands and replies. It sends the commands in alphabetical order to the command Kafka topic, which corresponds with the aggregate type of the command. It collects all the replies from the corresponding reply Kafka topics and compares the results with the files in the replies subdirectory. The differences are reported. If there is at least one difference the exit code will be 1 and 0 otherwise.
When comparing the actual with the expected results some technical fields are left out. These are _corr, _jwt, _seq and _timestamp. If a command doesn't contain a _jwt field, one will be added with the username "system". Commands will always get a new _corr field.
You should run the tool in the same working directory as your application. It will load its configuration in the same way. At least the entry kafka is expected. The entry environment is optional. When it is not present the value "dev" will be used.
You can build the tool with mvn clean package and run it as follows:
> java -jar target/pincette-jes-test-<version>-jar-with-dependencies.jar -d test
When creating your test flows makes sure they are repeatable. Because the identifiers are reused it is best to start with the put command and end with the delete command for every aggregate instance in the test set.
There is also a small API.