Improve temporary file handling in test

[occupant23]

Current solution:
Add a file to a List in NeodymiumTest and the inherited @AfterClass method will delete them after the test.

// create a file 
File file = new File(PATH);
// add it to the list
NeodymiumTest.tempFiles.add(file);

// this function will take care of the rest
@AfterClass
public static void cleanUp()
{
    for (File tempFile : tempFiles)
    {
        deleteTempFile(tempFile);
    }
}

An alternative solution could be to use the appropriate interface of File

File tempConfigFile = new File(PATH);
tempConfigFile.deleteOnExit();
// interact with the file
writeMapToPropertiesFile(properties, tempConfigFile);

Please validate this approach and remove the old approach and all unused functions if this works as expected.