@Test(expected = IllegalArgumentException.class)
    public void testFailUponUnitializedValue() {
        ConfigSubscriber subscriber = new ConfigSubscriber();
        subscriber.subscribe(DefaulttestConfig.class, "raw:defaultstring \"new value\"");
        subscriber.nextConfig(false);
        subscriber.close();
    }
Tests reading of a config containing
<ul>
<li>Missing values
<li>Default values
</ul>
<p/>
for
<p/>
<ul>
<li>String and
<li>Reference
</ul>

@author hmusum
config/src/test/java/com/yahoo/config/subscription/DefaultConfigTest.java