try {
    Connection conn = Mockito.mock(Connection.class);
    Mockito.when(conn.getAutoCommit()).thenReturn(true);
    PreparedStatement st = Mockito.mock(PreparedStatement.class);
    Mockito.when(conn.createStatement()).thenReturn(st);
    ResultSet rs = Mockito.mock(ResultSet.class);
    Mockito.when(st.getResultSet()).thenReturn(rs);
    ResultSetMetaData md = Mockito.mock(ResultSetMetaData.class);
    Mockito.when(rs.getMetaData()).thenReturn(md);
    Mockito.when(md.getColumnCount()).thenReturn(1);
    Mockito.when(rs.next()).thenReturn(true, false);
    ScriptRunner s = new ScriptRunner(conn, true, true);
    s.runScript(new StringReader("select 1;"), "test_db");
    Mockito.verify(md).getColumnLabel(0);
} catch(Exception e) {
    Assert.assertNotNull(e);
}