System.clearProperty("custom.prop.one");
        System.clearProperty("custom.prop.two");
        System.clearProperty("other.property");
    }

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

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