[jira] [Created] (NIFI-10047) Refactor Groovy Tests to Java

["David Handermann (Jira)" <ji...@apache.org>]

David Handermann created NIFI-10047:
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             Summary: Refactor Groovy Tests to Java
                 Key: NIFI-10047
                 URL: https://issues.apache.org/jira/browse/NIFI-10047
             Project: Apache NiFi
          Issue Type: Epic
          Components: Core Framework, Extensions, NiFi Registry
            Reporter: David Handermann
            Assignee: David Handermann


A number of component modules include unit tests written in Groovy, while the majority of tests are written in Java. Although Groovy has some advantages for testing in particular, the lack of consistency across the framework presents several maintenance challenges.

Groovy is similar enough to Java that it is possible to read with minimal effort, but writing idiomatic Groovy requires a greater understanding of the language. Some unit tests have leveraged Groovy to bypass method visibility constraints, which violates standard class and method contracts. Compiling and running tests in Groovy requires additional Maven configuration and plugin execution, which contributes to the overall runtime of continuous integration workflows. Using Java as the standard language for both implementation and tests also makes it easier for contributors to maintain and review changes.

For these reasons, existing Groovy test classes should be rewritten in Java, with the exception of scripting components.

Refactoring and rewriting tests should be done in logical groups of work to avoid missing important test functions in the conversion process. Some of the modules with larger numbers of Groovy tests include the following:

* nifi-toolkit-encrypt-config
* nifi-toolkit-admin
* nifi-registry-core
* nifi-security-utils
* nifi-elasticsearch-restapi-processors
* nifi-elasticsearch-client-service
* nifi-framework-cluster
* nifi-framework-core
* nifi-web-api
* nifi-lookup-services
* nifi-standard-processors



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