/**
     * Sets the Lasta environment configuration.
     *
     * @param env the Lasta environment string
     * @return this ExecJob instance for method chaining
     */
    public ExecJob lastaEnv(final String env) {
        lastaEnv = env;
        return this;
    }

    /**
     * Adds a system property to the command list.
     * If the property exists in the system, it uses that value with optional append value.

        assertEquals("-XX:+UseG1GC", execJob.jvmOptions.get(2));
    }

    // Test lastaEnv setter
    public void test_lastaEnv() {
        String testEnv = "production";
        ExecJob result = execJob.lastaEnv(testEnv);
        assertEquals(testEnv, execJob.lastaEnv);
        assertSame(execJob, result);
    }

    // Test addSystemProperty method