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Cobertura: Line coverage is incomplete for Jest-generated coverages

See original GitHub issue

Describe the bug When parsing Cobertura files generated with JestJS some line coverage information is not processed by ReportGenerator. Apparently, ReportGenerator only considers line coverage information attached to <class> element while ignoring information attached to <method> elements.

It works for other cobertura producers because they usually duplicate line coverage: so a line is attached to both a class and a method. In case with JestJS it’s not duplicated for some unknown reason, so a line is attached to either a class or a method.

To Reproduce Try to generate a report from this example:

<?xml version="1.0" ?>
<!DOCTYPE coverage SYSTEM "http://cobertura.sourceforge.net/xml/coverage-04.dtd">
<coverage lines-valid="7" lines-covered="2" line-rate="0.28" branches-valid="0" branches-covered="0" branch-rate="0" timestamp="1681280730343" complexity="0" version="0.1">
  <sources>
    <source>C:\coverage</source>
  </sources>
  <packages>
    <package name="some.package.name" line-rate="0.5" branch-rate="0">
      <classes>
        <class name="code-file.js" filename="src\code-file.js" line-rate="0.5" branch-rate="0">
          <methods>
            <method name="(anonymous_0)" hits="0" signature="()V">
              <lines>
                <line number="4" hits="0"/>
              </lines>
            </method>
            <method name="(anonymous_1)" hits="0" signature="()V">
              <lines>
                <line number="8" hits="0"/>
              </lines>
            </method>
            <method name="(anonymous_2)" hits="0" signature="()V">
              <lines>
                <line number="11" hits="0"/>
              </lines>
            </method>
          </methods>
          <lines>
            <line number="1" hits="3" branch="false"/>
            <line number="3" hits="3" branch="false"/>
            <line number="5" hits="0" branch="false"/>
            <line number="9" hits="0" branch="false"/>
          </lines>
        </class>
      </classes>
    </package>
  </packages>
</coverage>

Expected result: Covered = 2 Uncovered = 5 Coverable = 7 Actual result: