package org.codehaus.gmavenplus.mojo;
   
   import org.apache.maven.artifact.DependencyResolutionRequiredException;
   import org.apache.maven.plugin.MojoExecutionException;
   import org.apache.maven.plugins.annotations.LifecyclePhase;
   import org.apache.maven.plugins.annotations.Mojo;
   import org.apache.maven.plugins.annotations.Parameter;
   import org.apache.maven.plugins.annotations.ResolutionScope;
   import org.apache.maven.shared.model.fileset.FileSet;
  
  import java.io.File;
  import java.lang.reflect.InvocationTargetException;
  import java.net.MalformedURLException;
  
  
  /**
   * Compiles the test sources.
   * Note that this mojo requires Groovy >= 1.5.0, and >= 2.0.0-beta-3 (the indy version) for compiling with invokedynamic option.
   *
   * @author Keegan Witt
   * @since 1.0-beta-1
   */
  @Mojo(name = "compileTests", defaultPhase = LifecyclePhase.TEST_COMPILE, requiresDependencyResolution = ResolutionScope.TEST, threadSafe = true)
  public class CompileTestsMojo extends AbstractCompileMojo {
  
      /**
       * The Groovy test source files (relative paths).
       * Default: "${project.basedir}/src/test/groovy/**/*.groovy"
       */
      @Parameter
      protected FileSet[] testSources;
  
      /**
       * The location for the compiled test classes.
       */
      @Parameter(defaultValue = "${project.build.testOutputDirectory}")
      protected File testOutputDirectory;
  
      /**
       * Flag to allow test compilation to be skipped.
       */
      @Parameter(property = "maven.test.skip", defaultValue = "false")
      protected boolean skipTests;
  
      /**
       * Executes this mojo.
       *
       * @throws MojoExecutionException If an unexpected problem occurs (causes a "BUILD ERROR" message to be displayed)
       */
      @Override
      public void execute() throws MojoExecutionException {
          if (skipTests) {
              getLog().info("Compilation of tests is skipped.");
              return;
          }
  
          try {
              try {
                  getLog().debug("Project test classpath:\n" + project.getTestClasspathElements());
              } catch (DependencyResolutionRequiredException e) {
                  getLog().debug("Unable to log project test classpath");
              }
              doCompile(getTestFiles(testSources, false), project.getTestClasspathElements(), testOutputDirectory);
          } catch (ClassNotFoundException e) {
              throw new MojoExecutionException("Unable to get a Groovy class from classpath (" + e.getMessage() + "). Do you have Groovy as a compile dependency in your project?", e);
          } catch (InvocationTargetException e) {
              throw new MojoExecutionException("Error occurred while calling a method on a Groovy class from classpath.", e);
          } catch (InstantiationException e) {
              throw new MojoExecutionException("Error occurred while instantiating a Groovy class from classpath.", e);
          } catch (IllegalAccessException e) {
              throw new MojoExecutionException("Unable to access a method on a Groovy class from classpath.", e);
          } catch (DependencyResolutionRequiredException e) {
              throw new MojoExecutionException("Test dependencies weren't resolved.", e);
          } catch (MalformedURLException e) {
              throw new MojoExecutionException("Unable to add project test dependencies to classpath.", e);
          }
      }
  
  }