Headless Environment Error in AutoBackupTaskTest

[RalfBarkow]

We encountered an issue while running the AutoBackupTaskTest test case. The test fails with a HeadlessException due to the absence of an X11 DISPLAY variable. This issue arises in environments where a graphical display is not available, such as CI pipelines or headless servers.

Error Log:

Error:  Errors: 
Error:    AutoBackupTaskTest.setUp:44 » Headless 
No X11 DISPLAY variable was set,
but this program performed an operation which requires it.
[INFO] 
Error:  Tests run: 1, Failures: 0, Errors: 1, Skipped: 0

Steps to Reproduce:

1. Run the test suite in a headless environment (e.g., a CI pipeline or a server without a graphical display).
2. Observe the error in the AutoBackupTaskTest test case.

Expected Behavior: The test should either pass without requiring a graphical display or be skipped in headless environments.

Possible Solutions:

1. Use Headless Mode: Ensure that tests are run in headless mode by setting the java.awt.headless property to true in the test configuration.

   System.setProperty("java.awt.headless", "true");

   This can be done in the test setup method:

   @Before
   public void setUp() {
      System.setProperty("java.awt.headless", "true");
      // other setup code
   }

2. Skip Tests in Headless Environment: Modify the test to check if the environment is headless and skip the test if it is:

   @Before
   public void setUp() {
      if (GraphicsEnvironment.isHeadless()) {
          System.out.println("Skipping test in headless environment");
          return;
      }
      // other setup code
   }

Additional Context: This issue prevents the test suite from running successfully in headless environments, impacting the CI pipeline's ability to validate changes.