Support Gradle builds

[gclaussn]

For projects that are built using Gradle, a plugin should be implemented.

The Gradle plugin must:

• Provide the same configuration options as the Maven plugin does
• Generate the same test code as the Maven plugin does
• Be implemented in Java

Information:
https://www.baeldung.com/gradle-create-plugin

[tpeetz]

I would like to help on implementing a Gradle plugin

[gclaussn]

@tpeetz sounds good.

To implemented the Gradle plugin, the current maven-plugin project needs to be converted into a Maven multi module project:

• bpmn-driven-testing-root: Root POM
• bpmn-driven-testing-generator: Module with the generator code, so the it can be reused by both plugins
• bpmn-driven-testing-maven-plugin: Maven plugin, using the generator module
• bpmn-driven-testing-gradle-plugin: Gradle plugin, using the generator module; should be implemented as a standalone Gradle plugin (like described here: https://www.baeldung.com/gradle-create-plugin#standalone-plugin-project)

If you want I can prepare the Maven multi module project on a branch.

Or you just start the Gradle plugin implementation by adding the necessary dependencies to bpmn-driven-testing-maven-plugin, writing the plugin code and the related unit tests. Then I would integrate it later on.

[tpeetz]

I would prefer a Gradle multi-module build and use a Gradle plugin to build the Maven plugin.

[gclaussn]

I'm not sure if we should or can do that, since the current release build is based on a parent POM provided by Camunda (community-hub-release-parent) and on a special Maven based Github action (see deploy.yml).

Since we just build a simple JAR, which uses gradle-core and gradle-tooling-api as dependencies, a Maven build should be fine. It would be the minimum possible change - without reworking the release build.

[gclaussn]

Gradle plugin has been released and published:
https://search.maven.org/artifact/org.camunda.community/bpmn-driven-testing-gradle-plugin

A usage description can be found here:
https://github.com/camunda-community-hub/bpmn-driven-testing/tree/master/gradle-plugin

I tested it successfully against the existing integration tests using a Gradle 7.5.1 installation. Moreover I tested it with an older version of Eclipse and the current Intellij IDEA community edition.