### Question:
PropertiesLoaderUtil { public String getValue(String key) { String value = System.getProperty(key); return value == null ? properties.getProperty(key) : value; } PropertiesLoaderUtil(String... resourcesPath); String getValue(String key); String getProperty(String key); String getProperty(String key, String defaultValue); Integer getInteger(String key); Integer getInteger(String key, Integer defaultValue); Double getDouble(String key); Double getDouble(String key, Integer defaultValue); Boolean getBoolean(String key); Boolean getBoolean(String key, boolean defaultValue);  }### Answer:
@Test public void testGetValue() throws Exception { Assert.assertEquals("root", propertiesLoaderUtil.getProperty("jdbc.username")); }