#define private public - Claus Brod on stuff (05 Nov 2015)

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---+++ [[DefinePrivatePublic20151105CodeCoverage][Code coverage: I'm hooked]] (05 Nov 2015)

<summary>
Over the years, I've been using code coverage tools here and there, but somehow never got addicted. In one case
I remember, the tool in question simply could not cope with the codebase, making it impractical to use.
In another case, code coverage results were generated as part of a <a href="https://en.wikipedia.org/wiki/SonarQube">Sonar</a> build
but this build ran only every few days, which meant that it never created an immediate feedback loop for me. But today,
I think I finally saw the light.
</summary>

In a small Java project which I inherited, I learned about the code base by bringing the code under test, i.e. by
writing unit tests starting with the lower-level parts of the code and continuing on up to the its external API layers.
This already was quite a fruitful exercise, as it allowed me to make changes in the code very quickly, relying on
the unit tests to alert me of any breakage I caused along the way.

   * TBD: Cobertura versus Java 7
   * TBD: !JaCoCo 0.75 versus Jenkins plugin

    Code coverage report not working with Jenkins plugin for JaCoCo. https://issues.jenkins-ci.org/browse/JENKINS-28652 hints that this may be
    due to a version mismatch between the Jenkins plugin and JaCoCo, so I
    am downgrading to JaCoCo 0.7.4 to test this hypothesis.

Using code coverage, I identified small areas in the code which had not been executed yet by unit tests. Almost each of the tests
I added uncovered another corner case I had not considered yet, or which taught me something about the codebase. Examples: TBD

   * https://search.maven.org/#search|ga|1|a%3A%22jacoco-maven-plugin%22
   * https://github.com/cobertura/cobertura
   * https://stackoverflow.com/questions/10869127/maven-build-causes-verifyerror-with-java-1-7
   * http://mail.openjdk.java.net/pipermail/jdk7-dev/2011-September/002261.html
   * https://stackoverflow.com/questions/8151470/cobertura-java-7-support
   * https://wiki.jenkins-ci.org/display/JENKINS/JaCoCo+Plugin
   * https://dzone.com/articles/jacoco-jenkins-plugin

TBD:
   * Headline
   * ALLOWTOPICVIEW = Main.ClausBrod
   * ALLOWTOPICCHANGE = Main.ClausBrod

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