.orEmpty()
      .filter { f -> f.isFile }
      .toList()
  }
}

internal class MainTestProvider : SimpleProvider() {
  override fun arguments(): List<Any> {
    val mainFiles = mainFiles()
    return mainFiles
      .map {
        val suffix = it.path.replace("${prefix}samples/guide/src/main/java/", "")
        suffix
          .replace("(.*)\\.java".toRegex()) { mr ->

            <id>compile</id>
            <phase>initialize</phase>
            <goals>
              <goal>set</goal>
            </goals>
            <configuration>
              <mainFile>dependency-classes</mainFile>
            </configuration>
          </execution>
          <execution>
            <id>install</id>
            <phase>generate-sources</phase>
            <goals>
              <goal>set</goal>