@Test
public void phsShouldUsePlaceholderMap(){

    mockStatic(Placeholders.class);
    when(Placeholders.merge(placeholders, "a")).thenReturn("aa");
    when(Placeholders.merge(placeholders, "b")).thenReturn("bb");
    String[] actual = toTest.ph("a", "b");
    assertArrayEquals(new String[]{"aa", "bb"}, actual);
}