diffCoverage gives html report with "No class files specified."

[tinder-shivangshah]

jacocoTestReport generates the code coverage report. However, diffCoverage generates html file with "No class files specified." I suspect the issue is with classesDirs and srcDirs but unable to get proper report after trying multiple different approaches.

jacocoTestReport {
    reports {
        xml {
            enabled true
            destination file("${buildDir}/coverage-report/jacoco-report.xml")
        }
        html {
            enabled true
            destination file("${buildDir}/coverage-report")
        }
    }
    afterEvaluate {
        classDirectories.from = files(classDirectories.files.collect {
            fileTree(dir: it, exclude: [
                    '**/generated/**'
            ])
        })
    }
}

diffCoverageReport {
    diffSource {
        git.compareWith 'refs/remotes/origin/main'
    }

    jacocoExecFiles = files(jacocoTestReport.executionData)
    classesDirs = files(jacocoTestReport.classDirectories)
    srcDirs = files(jacocoTestReport.sourceDirectories)

    reports {
        html = true
        baseReportDir = "${buildDir}/coverage-report"
    }
}

[Bai-X]

Hi I encountered the same problem, how did you fix it?

[dbwiddis]

srcDirs = files(jacocoTestReport.sourceDirectories)

Hey @Bai-X I'm having the same issue. I've determined the "No class files specified" stems from an empty diff. I've tried using:

diffSource.git.compareWith 'refs/remotes/origin/main'

But this results in an empty diff.patch file.

I've been able to get it working by manually creating the patch file, e.g.,

$ git diff refs/remotes/origin/main > git.diff

And then using

diffSource.file = 'git.diff'

So it seems there's some bug with the git.compareWith syntax, or we're doing it wrong.

[dbwiddis]

Seems the changed files actually have to be committed for git.compareWith to work.