Kotest HTML Reporter

Kotest provides an HTML Reporter that can generate test reports in HTML format. This lets you visually inspect test execution results and provides detailed information about test execution.
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When using JUnit XML, tests with nested tests can generate XML results with output. Unfortunately, Gradle generates HTML reports using in-memory results that do not support nested tests, and it does not appear to be able to import results from another XML file.

To solve this problem, Kotest has a listener that can generate HTML reports based on XML reports generated by JUnit XML.

To use it, simply add it as a listener through project configuration.

class ProjectConfig : AbstractProjectConfig() {

   override val specExecutionOrder = SpecExecutionOrder.Annotated

    override fun extensions(): List<Extension> = listOf(
        JunitXmlReporter(
            includeContainers = false,
            useTestPathAsName = true,
        ),
        HtmlReporter()
    )
}

Then add html.required.set(false) to the test task so Gradle does not generate its own HTML report.

tasks.test {
  useJUnitPlatform()
  reports {
    html.required.set(false)
    junitXml.required.set(false)
  }
  systemProperty("gradle.build.dir", project.buildDir)
}

Also add JunitXmlReporter. This creates the XML reports needed to generate the HTML report. No additional configuration is required; simply start generating the HTML report.

By default, reports are stored at /to/buildDir/reports/tests/test, but you can change this by modifying the outputDir parameter.

References