@Test
public void validEntityTagsValueWitSpaces() {

    Mockito.when(headerDefinition.getJavaType()).thenReturn(EntityTagMatchers.class);
    final String value = "\"foo\", \"bar\"";
    try {
        underTest.accept(headerDefinition, value);
    } catch (final Throwable t) {
        fail(value + " is a valid entity-tag!");
    }
}