hmm... this worked until I moved the test to a new

JvmTestSuite

called

testIntegration

. How does this file get created?

Test runtime classpath does not contain plugin metadata file 'plugin-under-test-metadata.properties'
org.gradle.testkit.runner.InvalidPluginMetadataException: Test runtime classpath does not contain plugin metadata file 'plugin-under-test-metadata.properties'

@ParameterizedTest
  @ArgumentsSource(BuildScriptArgumentsProvider.class)
  void configurationCache(String fileName, String buildScript) throws IOException {
    Files.writeString(testProjectDir.toPath().resolve(fileName), buildScript);
    var build = GradleRunner.create()
      .withProjectDir(testProjectDir)
      .withArguments("logGit", "--configuration-cache", "--stacktrace")
      .withPluginClasspath()
      .build();

    assertThat(build.getOutput()).contains("semver:0.1.0");
  }

Iirc you need something like

gradlePlugin {
    testSourceSets sourceSets.testIntegration
}

to make

withPluginClasspath()

working.

Fwiw, I do that right from the TestSuite registration: https://github.com/tbroyer/gradle-errorprone-plugin/blob/4830c03b6d072e80a7f0f8cb186ea04cf265c2ea/build.gradle.kts#L95-L96