protected void assertMkdirs(File file){
  assertTrue("Could not create directory '" + file.getAbsolutePath() + "'",file.mkdirs());
}

protected void assertMkdirs ( File file ) { assertTrue ( "Could not create directory '" + file . getAbsolutePath ( ) + "'" , file . mkdirs ( ) ) ; }
asserts that creating a directory from the given file worked
