code: @Test public void should_return_null_when_cannot_map_entity() throws Exception {
    EntityMeta meta=buildEntityMeta();
    String queryString="select id from test";
    initBuilder(queryString,meta,meta.getPropertyMetas(),false);
    when(daoContext.execute(any(AbstractStatementWrapper.class)).one()).thenReturn(row);
    when(mapper.mapRowToEntityWithPrimaryKey(eq(meta),eq(row),Mockito.<Map<String,PropertyMeta>>any(),eq(true))).thenReturn(null);
    CompleteBean actual=builder.getFirst();
    assertThat(actual).isNull();
    verifyZeroInteractions(contextFactory,proxifier);
  }
  