private boolean verifyParameters() throws MojoFailureException {
    // DUNS
    if (skipNar || skipNarTests || skipNarExec) {
      getLog().info("Tests are skipped.");
      return false;
    }

    if (!testClassesDirectory.exists()) {
      if (failIfNoTests != null && failIfNoTests.booleanValue()) {
        throw new MojoFailureException("No tests to run!");
      }
      getLog().info("No tests to run.");
      return false;
    }

    if (useSystemClassLoader != null && ForkConfiguration.FORK_NEVER.equals(forkMode)) {
      getLog().warn("useSystemClassloader setting has no effect when not forking");
    }

    return true;
  }
  private SurefireBooter constructSurefireBooter()
      throws MojoExecutionException, MojoFailureException {
    SurefireBooter surefireBooter = new SurefireBooter();

    Artifact surefireArtifact =
        (Artifact) pluginArtifactMap.get("org.apache.maven.surefire:surefire-booter");
    if (surefireArtifact == null) {
      throw new MojoExecutionException(
          "Unable to locate surefire-booter in the list of plugin artifacts");
    }

    surefireArtifact
        .isSnapshot(); // TODO: this is ridiculous, but it fixes getBaseVersion to be -SNAPSHOT if
    // needed

    Artifact junitArtifact;
    Artifact testNgArtifact;
    try {
      addArtifact(surefireBooter, surefireArtifact);

      junitArtifact = (Artifact) projectArtifactMap.get(junitArtifactName);
      // SUREFIRE-378, junit can have an alternate artifact name
      if (junitArtifact == null && "junit:junit".equals(junitArtifactName)) {
        junitArtifact = (Artifact) projectArtifactMap.get("junit:junit-dep");
      }

      // TODO: this is pretty manual, but I'd rather not require the plugin > dependencies section
      // right now
      testNgArtifact = (Artifact) projectArtifactMap.get(testNGArtifactName);

      if (testNgArtifact != null) {
        VersionRange range = VersionRange.createFromVersionSpec("[4.7,)");
        if (!range.containsVersion(new DefaultArtifactVersion(testNgArtifact.getVersion()))) {
          throw new MojoFailureException(
              "TestNG support requires version 4.7 or above. You have declared version "
                  + testNgArtifact.getVersion());
        }

        convertTestNGParameters();

        if (this.testClassesDirectory != null) {
          properties.setProperty("testng.test.classpath", testClassesDirectory.getAbsolutePath());
        }

        addArtifact(surefireBooter, testNgArtifact);

        // The plugin uses a JDK based profile to select the right testng. We might be explicity
        // using a
        // different one since its based on the source level, not the JVM. Prune using the filter.
        addProvider(
            surefireBooter, "surefire-testng", surefireArtifact.getBaseVersion(), testNgArtifact);
      } else if (junitArtifact != null && junitArtifact.getBaseVersion().startsWith("4")) {
        addProvider(surefireBooter, "surefire-junit4", surefireArtifact.getBaseVersion(), null);
      } else {
        // add the JUnit provider as default - it doesn't require JUnit to be present,
        // since it supports POJO tests.
        addProvider(surefireBooter, "surefire-junit", surefireArtifact.getBaseVersion(), null);
      }
    } catch (ArtifactNotFoundException e) {
      throw new MojoExecutionException(
          "Unable to locate required surefire provider dependency: " + e.getMessage(), e);
    } catch (InvalidVersionSpecificationException e) {
      throw new MojoExecutionException(
          "Error determining the TestNG version requested: " + e.getMessage(), e);
    } catch (ArtifactResolutionException e) {
      throw new MojoExecutionException(
          "Error to resolving surefire provider dependency: " + e.getMessage(), e);
    }

    if (suiteXmlFiles != null && suiteXmlFiles.length > 0 && test == null) {
      if (testNgArtifact == null) {
        throw new MojoExecutionException(
            "suiteXmlFiles is configured, but there is no TestNG dependency");
      }

      // TODO: properties should be passed in here too
      surefireBooter.addTestSuite(
          "org.apache.maven.surefire.testng.TestNGXmlTestSuite",
          new Object[] {
            suiteXmlFiles,
            testSourceDirectory.getAbsolutePath(),
            testNgArtifact.getVersion(),
            testNgArtifact.getClassifier(),
            properties,
            reportsDirectory
          });
    } else {
      List includeList;
      List excludeList;

      if (test != null) {
        // Check to see if we are running a single test. The raw parameter will
        // come through if it has not been set.

        // FooTest -> **/FooTest.java

        includeList = new ArrayList();

        excludeList = new ArrayList();

        if (failIfNoTests == null) {
          failIfNoTests = Boolean.TRUE;
        }

        String[] testRegexes = StringUtils.split(test, ",");

        for (int i = 0; i < testRegexes.length; i++) {
          String testRegex = testRegexes[i];
          if (testRegex.endsWith(".java")) {
            testRegex = testRegex.substring(0, testRegex.length() - 5);
          }
          // Allow paths delimited by '.' or '/'
          testRegex = testRegex.replace('.', '/');
          includeList.add("**/" + testRegex + ".java");
        }
      } else {
        includeList = this.includes;

        excludeList = this.excludes;

        // defaults here, qdox doesn't like the end javadoc value
        // Have to wrap in an ArrayList as surefire expects an ArrayList instead of a List for some
        // reason
        if (includeList == null || includeList.size() == 0) {
          includeList =
              new ArrayList(
                  Arrays.asList(
                      new String[] {"**/Test*.java", "**/*Test.java", "**/*TestCase.java"}));
        }
        if (excludeList == null || excludeList.size() == 0) {
          excludeList = new ArrayList(Arrays.asList(new String[] {"**/*$*"}));
        }
      }

      if (testNgArtifact != null) {
        surefireBooter.addTestSuite(
            "org.apache.maven.surefire.testng.TestNGDirectoryTestSuite",
            new Object[] {
              testClassesDirectory,
              includeList,
              excludeList,
              testSourceDirectory.getAbsolutePath(),
              testNgArtifact.getVersion(),
              testNgArtifact.getClassifier(),
              properties,
              reportsDirectory
            });
      } else {
        String junitDirectoryTestSuite;
        if (junitArtifact != null
            && junitArtifact.getBaseVersion() != null
            && junitArtifact.getBaseVersion().startsWith("4")) {
          junitDirectoryTestSuite = "org.apache.maven.surefire.junit4.JUnit4DirectoryTestSuite";
        } else {
          junitDirectoryTestSuite = "org.apache.maven.surefire.junit.JUnitDirectoryTestSuite";
        }

        // fall back to JUnit, which also contains POJO support. Also it can run
        // classes compiled against JUnit since it has a dependency on JUnit itself.
        surefireBooter.addTestSuite(
            junitDirectoryTestSuite, new Object[] {testClassesDirectory, includeList, excludeList});
      }
    }

    // ----------------------------------------------------------------------
    //
    // ----------------------------------------------------------------------

    getLog().debug("Test Classpath :");

    // Check if we need to add configured classes/test classes directories here.
    // If they are configured, we should remove the default to avoid conflicts.
    if (!project.getBuild().getOutputDirectory().equals(classesDirectory.getAbsolutePath())) {
      classpathElements.remove(project.getBuild().getOutputDirectory());
      classpathElements.add(classesDirectory.getAbsolutePath());
    }
    if (!project
        .getBuild()
        .getTestOutputDirectory()
        .equals(testClassesDirectory.getAbsolutePath())) {
      classpathElements.remove(project.getBuild().getTestOutputDirectory());
      classpathElements.add(testClassesDirectory.getAbsolutePath());
    }

    for (Iterator i = classpathElements.iterator(); i.hasNext(); ) {
      String classpathElement = (String) i.next();

      getLog().debug("  " + classpathElement);

      surefireBooter.addClassPathUrl(classpathElement);
    }

    Toolchain tc = getToolchain();

    if (tc != null) {
      getLog().info("Toolchain in surefire-plugin: " + tc);
      if (ForkConfiguration.FORK_NEVER.equals(forkMode)) {
        forkMode = ForkConfiguration.FORK_ONCE;
      }
      if (jvm != null) {
        getLog().warn("Toolchains are ignored, 'executable' parameter is set to " + jvm);
      } else {
        jvm = tc.findTool("java"); // NOI18N
      }
    }

    if (additionalClasspathElements != null) {
      for (Iterator i = additionalClasspathElements.iterator(); i.hasNext(); ) {
        String classpathElement = (String) i.next();

        getLog().debug("  " + classpathElement);

        surefireBooter.addClassPathUrl(classpathElement);
      }
    }

    // ----------------------------------------------------------------------
    // Forking
    // ----------------------------------------------------------------------

    ForkConfiguration fork = new ForkConfiguration();

    // DUNS
    if (project.getPackaging().equals("nar") || (getNarArtifacts().size() > 0)) {
      forkMode = "pertest";
    }

    fork.setForkMode(forkMode);

    processSystemProperties(!fork.isForking());

    if (getLog().isDebugEnabled()) {
      showMap(systemProperties, "system property");
    }

    if (fork.isForking()) {
      useSystemClassLoader = useSystemClassLoader == null ? Boolean.TRUE : useSystemClassLoader;
      fork.setUseSystemClassLoader(useSystemClassLoader.booleanValue());
      fork.setUseManifestOnlyJar(useManifestOnlyJar);

      fork.setSystemProperties(systemProperties);

      if ("true".equals(debugForkedProcess)) {
        debugForkedProcess =
            "-Xdebug -Xnoagent -Djava.compiler=NONE -Xrunjdwp:transport=dt_socket,server=y,suspend=y,address=5005";
      }

      fork.setDebugLine(debugForkedProcess);

      if (jvm == null || "".equals(jvm)) {
        // use the same JVM as the one used to run Maven (the "java.home" one)
        jvm = System.getProperty("java.home") + File.separator + "bin" + File.separator + "java";
        getLog().debug("Using JVM: " + jvm);
      }

      fork.setJvmExecutable(jvm);

      if (workingDirectory != null) {
        fork.setWorkingDirectory(workingDirectory);
      } else {
        fork.setWorkingDirectory(basedir);
      }

      // BEGINDUNS
      if (argLine == null) {
        argLine = "";
      }

      StringBuffer javaLibraryPath = new StringBuffer();
      if (testJNIModule()) {
        // Add libraries to java.library.path for testing
        File jniLibraryPathEntry =
            getLayout()
                .getLibDirectory(
                    getTargetDirectory(),
                    getMavenProject().getArtifactId(),
                    getMavenProject().getVersion(),
                    getAOL().toString(),
                    Library.JNI);
        if (jniLibraryPathEntry.exists()) {
          getLog().debug("Adding library directory to java.library.path: " + jniLibraryPathEntry);
          if (javaLibraryPath.length() > 0) {
            javaLibraryPath.append(File.pathSeparator);
          }
          javaLibraryPath.append(jniLibraryPathEntry);
        }

        File sharedLibraryPathEntry =
            getLayout()
                .getLibDirectory(
                    getTargetDirectory(),
                    getMavenProject().getArtifactId(),
                    getMavenProject().getVersion(),
                    getAOL().toString(),
                    Library.SHARED);
        if (sharedLibraryPathEntry.exists()) {
          getLog()
              .debug("Adding library directory to java.library.path: " + sharedLibraryPathEntry);
          if (javaLibraryPath.length() > 0) {
            javaLibraryPath.append(File.pathSeparator);
          }
          javaLibraryPath.append(sharedLibraryPathEntry);
        }

        // add jar file to classpath, as one may want to read a
        // properties file for artifactId and version
        String narFile = "target/" + project.getArtifactId() + "-" + project.getVersion() + ".jar";
        getLog().debug("Adding to surefire test classpath: " + narFile);
        surefireBooter.addClassPathUrl(narFile);
      }

      List dependencies =
          getNarArtifacts(); // TODO: get seems heavy, not sure if we can push this up to before the
                             // fork to use it multiple times.
      for (Iterator i = dependencies.iterator(); i.hasNext(); ) {
        NarArtifact dependency = (NarArtifact) i.next();
        // FIXME this should be overridable
        // NarInfo info = dependency.getNarInfo();
        // String binding = info.getBinding(getAOL(), Library.STATIC);
        // NOTE: fixed to shared, jni
        String[] bindings = {Library.SHARED, Library.JNI};
        for (int j = 0; j < bindings.length; j++) {
          String binding = bindings[j];
          if (!binding.equals(Library.STATIC)) {
            File depLibPathEntry =
                getLayout()
                    .getLibDirectory(
                        getUnpackDirectory(),
                        dependency.getArtifactId(),
                        dependency.getVersion(),
                        getAOL().toString(),
                        binding);
            if (depLibPathEntry.exists()) {
              getLog()
                  .debug("Adding dependency directory to java.library.path: " + depLibPathEntry);
              if (javaLibraryPath.length() > 0) {
                javaLibraryPath.append(File.pathSeparator);
              }
              javaLibraryPath.append(depLibPathEntry);
            }
          }
        }
      }

      // add final javalibrary path
      if (javaLibraryPath.length() > 0) {
        // NOTE java.library.path only works for the jni lib itself, and
        // not for its dependent shareables.
        // NOTE: java.library.path does not work with arguments with
        // spaces as
        // SureFireBooter splits the line in parts and then quotes
        // it wrongly
        NarUtil.addLibraryPathToEnv(javaLibraryPath.toString(), environmentVariables, getOS());
      }

      // necessary to find WinSxS
      if (getOS().equals(OS.WINDOWS)) {
        environmentVariables.put(
            "SystemRoot", NarUtil.getEnv("SystemRoot", "SystemRoot", "C:\\Windows"));
      }
      // ENDDUNS

      fork.setArgLine(argLine);

      fork.setEnvironmentVariables(environmentVariables);

      if (getLog().isDebugEnabled()) {
        showMap(environmentVariables, "environment variable");

        fork.setDebug(true);
      }

      if (argLine != null) {
        List args = Arrays.asList(argLine.split(" "));
        if (args.contains("-da") || args.contains("-disableassertions")) {
          enableAssertions = false;
        }
      }
    }

    surefireBooter.setFailIfNoTests(failIfNoTests == null ? false : failIfNoTests.booleanValue());

    surefireBooter.setForkedProcessTimeoutInSeconds(forkedProcessTimeoutInSeconds);

    surefireBooter.setRedirectTestOutputToFile(redirectTestOutputToFile);

    surefireBooter.setForkConfiguration(fork);

    surefireBooter.setChildDelegation(childDelegation);

    surefireBooter.setEnableAssertions(enableAssertions);

    surefireBooter.setReportsDirectory(reportsDirectory);

    addReporters(surefireBooter, fork.isForking());

    return surefireBooter;
  }