### Question:
Configuration { static String getConfigValue(final String propertyName) { return getConfiguration().getProperty(propertyName); } private  Configuration();  static final String CONFIG_FILE; static final String REDIS_HOST; static final String REDIS_PORT; static final String REDIS_PASSWORD; static final String FALLBACK_RHYMES; static final String DEFAULT_RHYMES; }### Answer:
@Test public void testGetConfigValue() { assertNull(getConfigValue("unexisting")); assertEquals(getConfigValue(REDIS_HOST), "localhost"); }