cobertura reporter does not construct package name attributes from projectRoot

[tsondergaard]

The image below shows an excerpt of a coverage report displayed by the jenkins CI cobertura plugin for a project that is mostly implemented in C++, but which has a component written in TypeScript running in node that is tested with jest using the istanbul cobertura coverage reporter. In the picture "sparrow" is the name of a component written in C++. The "src", "src.controller", "src.db", etc packages are all from the node subproject. My issue is that these packages don't have the subproject name prefixed.

I pass a projectRoot config property to jest which istanbul-reports/lib/cobertura/index.js uses for filepaths, but not for package names. This is what is generated:

<?xml version="1.0" ?>
<!DOCTYPE coverage SYSTEM "http://cobertura.sourceforge.net/xml/coverage-04.dtd">
<coverage lines-valid="3046" lines-covered="1582" line-rate="0.5194" branches-valid="1355" branches-covered="531" branch-rate="0.39189999999999997" timestamp="1586032913784" complexity="0" version="0.1">
  <sources>
    <source>/home/foo/src/main-project</source>
  </sources>
  <packages>
    <package name="src" line-rate="0.7398" branch-rate="0.2386">
      <classes>
        <class name="app.ts" filename="sub-project/src/app.ts" line-rate="0.8934000000000001" branch-rate="0.16">
         ....

The problem is the package attribute name="src" it should be name="sub-project.src" to be consistent with the projectRoot and match the path in the class filename="sub-project/src/app.ts" attribute.

[bitcloud]

I don't think that this issue can bis solved in the cobertura reporter as it depends on getRelativeName from SummarizerFactory.

SummarizerFactory try's to detect the project root by automatically detecting a common base directory.

/project/src/package1/subpackage1/index.js
/project/src/package1/subpackage2/index.js
----
commonParent => /project/src/package1

I guess SummarizerFactory needs to be projectRoot aware to fix this.