### Question:
ConfigValueConfigSourceWrapper implements ConfigValueConfigSource, Serializable { @Override public String getValue(final String propertyName) { return configSource.getValue(propertyName); } private  ConfigValueConfigSourceWrapper(final ConfigSource configSource); @Override ConfigValue getConfigValue(final String propertyName); @Override Map<String, ConfigValue> getConfigValueProperties(); @Override Map<String, String> getProperties(); @Override String getValue(final String propertyName); @Override Set<String> getPropertyNames(); @Override String getName(); @Override int getOrdinal();  }### Answer:
@Test public void getValue() { assertEquals("1234", config().getValue("my.prop")); }