### Question:
ListablePropertyPlaceholderConfigurer extends PropertyPlaceholderConfigurer { public static Properties getProperties() { return properties; }  @Override void setLocations(Resource[] locations); @Override void setIgnoreResourceNotFound(boolean ignoreResourceNotFound); @Override void setSystemPropertiesModeName(String constantName); static Properties getProperties();  }### Answer:
@Test public void testPropertiesLoad() throws IOException, ClassNotFoundException { assertEquals("test", getProperties().getProperty("custom.plugin.stringValue")); }