groovy.java

channel   = manager.build.workspace.channel;
workspace = manager.build.workspace.toString();

def readFromFile( file ) {
  return new hudson.FilePath( channel, workspace + "/" + file ).readToString()
}

failedTests = manager.build.testResultAction.getFailedTests()

for ( int i = 0; i < failedTests.size() ; i++ ) {

  failedTest    = failedTests.get( i )
  testClass     = failedTest.getClassName()
  testExample   = failedTest.getName()
  testDirectory = "output/html/" + testClass + "/" + testExample

  image = manager.build.getEnvironment(manager.listener)['BUILD_URL'] + "artifact/" + testDirectory + "/screenshot.png"

  image_src = image
  image_src = image_src.replaceAll( '\\[', "%5B" )
  image_src = image_src.replaceAll( '\\]', "%5D" )
  image_src = image_src.replaceAll( '\\>', "%3E" )
  image_src = image_src.replaceAll( ' ', "%20" )

  output_html  = ""
  output_html += "<div class=\"selenium-test-result\">"
  output_html += readFromFile( testDirectory + "/result.html" )
  output_html += "<h3>Screenshot</h3>"
  output_html += "<a href=\"" + image + "\"><img style=\"width:50%;height:50%;\" src=\"" + image_src + "\"></a><br><br>"
  output_html += "<a href=\"" + image + "\">" + image + "</a> "
  output_html += "</div>"

  failedTest.description = output_html

}