rzo1 opened a new pull request, #431:
URL: https://github.com/apache/opennlp/pull/431

   Thank you for contributing to Apache OpenNLP.
   
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   ------------------------
   
   # What does this PR do?
   
   This PR migrates the current JUnit 4 tests towards JUnit 5.
   
   To do so, I conducted the following steps:
   
   - Automatically convert JUnit 4 via 
https://github.com/junit-pioneer/convert-junit4-to-junit5 (sadly, it doesn't 
guarantee formatting)
   - Format the converted classes according to the OpenNLP style guide via the 
provided IntelliJ Formatter rules. 
   - Manually adjust test cases, in which an automatic conversion wasn't 
possible due to method signature ambiquity (mostly eps/delta for float/double 
comparisions, String comparisions with messages).
   - Replacement of `@TemporaryFolder` rules with `@TempDir` and related 
compensation code.
   
   After the conversion I run a `mvn clean install -Pjacoco`:
   
   
   ```bash
   [INFO] Scanning for projects...
   [INFO] 
------------------------------------------------------------------------
   [INFO] Reactor Build Order:
   [INFO] 
   [INFO] Apache OpenNLP Reactor
   [INFO] Apache OpenNLP Tools
   [INFO] Apache OpenNLP UIMA Annotators
   [INFO] Apache OpenNLP Brat Annotator
   [INFO] Apache OpenNLP Morfologik Addon
   [INFO] Apache OpenNLP Documentation
   [INFO] Apache OpenNLP Distribution
   [INFO] opennlp-dl
   [INFO]                                                                       
  
   [INFO] 
------------------------------------------------------------------------
   [INFO] Building Apache OpenNLP Reactor 2.0.1-SNAPSHOT
   [INFO] 
------------------------------------------------------------------------
   ...
   [INFO] --- maven-surefire-plugin:2.22.2:test (default-test) @ opennlp-tools 
---
   [INFO] 
   [INFO] -------------------------------------------------------
   [INFO]  T E S T S
   [INFO] -------------------------------------------------------
   ...
   [INFO] Results:
   [INFO] 
   [WARNING] Tests run: 810, Failures: 0, Errors: 0, Skipped: 1
   ...
   [INFO] 
   [INFO] --- maven-surefire-plugin:2.22.2:test (default-test) @ opennlp-uima 
---
   [INFO] 
   [INFO] -------------------------------------------------------
   [INFO]  T E S T S
   [INFO] -------------------------------------------------------
   ...
   [INFO] Results:
   [INFO] 
   [INFO] Tests run: 3, Failures: 0, Errors: 0, Skipped: 0
   ...
   [INFO] --- maven-surefire-plugin:2.22.2:test (default-test) @ 
opennlp-morfologik-addon ---
   [INFO] 
   [INFO] -------------------------------------------------------
   [INFO]  T E S T S
   [INFO] -------------------------------------------------------
   ...
   [INFO] Results:
   [INFO] 
   [INFO] Tests run: 7, Failures: 0, Errors: 0, Skipped: 0
   ...
   [INFO] --- maven-surefire-plugin:2.22.2:test (default-test) @ opennlp-dl ---
   [INFO] 
   [INFO] -------------------------------------------------------
   [INFO]  T E S T S
   [INFO] -------------------------------------------------------
   ...
   [INFO] Results:
   [INFO] 
   [INFO] Tests run: 2, Failures: 0, Errors: 0, Skipped: 0
   
   ```
   
   Maven discovers and executes 810 (tools) + 3 (uima) + 7 (morfologik) + 2 
(dl) = 822 tests (+1 skipped) via JUnit 5, which is similar to the current 
master, which uses JUnit 4.
   
   # Additional Notes
   
   I know that a huge PR is very difficult to review, so the question would be:
   
   - Shall we go on a per (a) package basis or per (b) module basis to reduce 
review burden?
   
   Breaking down the changes wouldn't be that hard.
   
   


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