@Test
public void prependTo_withSingleColumn_prependsProperSql() {

  /* Given */
  SetImpl set = new SetImpl(new String[] {"a"}, mock(SqlPart.class));
  RawSqlBuilder builder = new RawSqlBuilderImpl();
  /* When */
  set.prependTo(builder);
  /* Then */
  assertThat(builder.toString(), is("SET a=?"));
}