@Test
public void testGetProperties() throws Exception {

    Map<String, PropertyValue> props = envPropertySource.getProperties();
    for (Map.Entry<String, PropertyValue> en : props.entrySet()) {
        if (!en.getKey().startsWith("_")) {
            assertThat(en.getValue().getValue()).isEqualTo(System.getenv(en.getKey()));
        }
    }
}