public void testBuildSelectClause() {
Query query = new Query();
QuerySelection querySelection = new QuerySelection();
querySelection.addColumn(new SimpleColumn("ID"));
querySelection.addColumn(
new AggregationColumn(new SimpleColumn("Salary"), AggregationType.MIN));
query.setSelection(querySelection);
StrBuilder queryStringBuilder = new StrBuilder();
SqlDataSourceHelper.appendSelectClause(query, queryStringBuilder);
assertEquals(queryStringBuilder.toString(), "SELECT `ID`, min(`Salary`) ",