@Test
public void testClean() {

    assertThat(policy.clean("")).isEqualTo("");
    assertThat(policy.clean(" ")).isEqualTo(" ");
    assertThat(policy.clean("a")).isEqualTo("A");
    assertThat(policy.clean("a ")).isEqualTo("A");
    assertThat(policy.clean(" a ")).isEqualTo("A");
    assertThat(policy.clean(" ave a ")).isEqualTo("A");
    assertThat(policy.clean("St Marks")).isEqualTo("MARKS");
}