@Test
public void sourceWillProperlyInitializedWithMapWithoutPrefix() throws Exception {

    MapPropertySource propertySource = new MapPropertySource("UT", sourceMap);
    assertThat(propertySource.getProperties()).describedAs("Should contain exactly 2 properties.")
                                              .hasSize(2);
    assertThat(propertySource.get("a")).isNotNull();
    assertThat(propertySource.get("b")).isNotNull();
}