public void test_deleteTempDir() throws IOException {
        // Test with null
        execJob.testDeleteTempDir(null);

        // Test with existing directory
        File testDir = new File(tempDir, "test_delete_dir");
        assertTrue(testDir.mkdir());
        assertTrue(testDir.exists());

        execJob.testDeleteTempDir(testDir);
        assertFalse(testDir.exists());

        // Test with non-existent directory