### Question:
DerbyDialect extends Dialect { public String getLimitString(String sql, int offset,String offsetPlaceholder, int limit, String limitPlaceholder) { throw new UnsupportedOperationException( "paged queries not supported" ); }  boolean supportsLimit(); boolean supportsLimitOffset(); String getLimitString(String sql, int offset,String offsetPlaceholder, int limit, String limitPlaceholder);  }### Answer:
@Test(expected=UnsupportedOperationException.class) public void getLimitString() { Assert.assertEquals("", dialect.getLimitString("select * from user", 0, 0)); Assert.assertEquals("", dialect.getLimitString("select * from user", 0, 12)); Assert.assertEquals("", dialect.getLimitString("select * from user", 12, 0)); Assert.assertEquals("", dialect.getLimitString("select * from user", 12, 34)); }
@Test(expected=UnsupportedOperationException.class) public void getLimitStringWithPlaceHolader() { String OFFSET = ":offset"; String LIMIT = ":limit"; Assert.assertEquals("select * from user limit :limit", dialect.getLimitString("select * from user", 0,OFFSET, 0,LIMIT)); Assert.assertEquals("select * from user limit :limit", dialect.getLimitString("select * from user", 0,OFFSET,12,LIMIT)); Assert.assertEquals("select * from user limit :offset,:limit", dialect.getLimitString("select * from user", 12, OFFSET,0,LIMIT)); Assert.assertEquals("select * from user limit :offset,:limit", dialect.getLimitString("select * from user", 12,OFFSET, 34,LIMIT)); }