I haven't looked at Boston's test specifically, but most of them are written in such a way that it requires insider knowledge of the test to do well (references to directional items that mean nothing in the context of the city in question). Look back at the New Haven firefighter case. While the court ruled in favor of the white firefighter who had been "discriminated" against, it was clear from the evidence that the written test had problems that made it biased against African-American candidates. It is hard to argue the test is racially neutral when other nearby jurisdictions used a different written test that resulted in the top scorers being spread across races in proportion to their percentages in the testing pool and that the scores on the oral portion of the exam were basically the same across all races.
If anything, the tests are biased against whites, in hope of raising Afro scores. Biasing tests in favor of Afros is standard practice. And, how is it that "insider knowledge" (WTF) on a test helps whites more than Afros?
Afros are dumb animals the world-around. So,
they can't pass tests in other jurisdictions, either. If there's a difference with Boston, they're just not giving Afros "enough" free points ("race norming") on the tests. No one is asking for these tests from nearby jurisdictions be used in Boston too, because the test isn't the problem.