System.setProperty("test_var", "underscore");
        value = "${test_var}";
        assertEquals("underscore", ResourceUtil.resolve(value));

        // Clean up test properties
        System.clearProperty("var1");
        System.clearProperty("var2");
        System.clearProperty("special");
        System.clearProperty("123");
        System.clearProperty("test_var");
    }

        boolean[] pbCallExecuted = { false };

        Consumer<ProcessBuilder> pbCall = pb -> {
            pb.redirectErrorStream(true);
            pb.environment().put("TEST_VAR", "test_value");
            pbCallExecuted[0] = true;
        };

        try {
            JobProcess jobProcess = processHelper.startProcess(sessionId, cmdList, pbCall);
            assertNotNull(jobProcess);