@SuppressWarnings("unchecked")
@Test
public void testSimpleTemplate() throws Exception {

    TemplateContainer tc = new TemplateContainer() {
        private Column[] columns = new Column[]{
                new LongColumn("column1"),
                new LongColumn("column2"),
                new StringColumn("column3")
        };
        public Column[] getColumns() {
            return columns;
        }
        public String getHeader() {
            return null;
        }
        public Map<String, RuleTemplate> getTemplates() {
            Map<String, RuleTemplate> templates = new HashMap<String, RuleTemplate>();
            RuleTemplate ruleTemplate = new RuleTemplate("template1", this);
            ruleTemplate.addColumn("column1 == 10");
            ruleTemplate.addColumn("column2 < 5 || > 20");
            ruleTemplate.addColumn("column3 == \"xyz\"");
            templates.put("template1", ruleTemplate);
            return templates;
        }
        public Column getColumn(String name) {
            return columns[Integer.parseInt(name.substring(6)) - 1];
        }
    };
    DefaultTemplateRuleBase ruleBase = new DefaultTemplateRuleBase(tc);
    InternalKnowledgePackage[] packages = ((KnowledgeBaseImpl)ruleBase.newStatefulSession().getKieBase()).getPackages();
    assertEquals(1, packages.length);
    Map<String, Class<?>> globals = packages[0].getGlobals();
    assertEquals(DefaultGenerator.class, globals.get("generator"));
    Collection<org.kie.api.definition.rule.Rule> rules = packages[0].getRules();
    assertEquals(1, rules.size());
    assertEquals("template1", rules.iterator().next().getName());
    GroupElement lhs = ((RuleImpl)rules.iterator().next()).getLhs();
    //when
    //  r : Row()
    //  column1 : Column(name == "column1")
    //  exists LongCell(row == r, column == column1, value == 10)
    //  column2 : Column(name == "column2")
    //  exists LongCell(row == r, column == column2, value < 5 | > 20)
    //  column3 : Column(name == "column3")
    //  exists StringCell(row == r, column == column3, value == "xyz")
    assertEquals(7, lhs.getChildren().size());
    org.drools.core.rule.Pattern pattern = (org.drools.core.rule.Pattern) lhs.getChildren().get(1);
    assertEquals(1, pattern.getConstraints().size());
    Constraint constraint = pattern.getConstraints().get(0);
    GroupElement exists = (GroupElement) lhs.getChildren().get(2);
    pattern = (org.drools.core.rule.Pattern) exists.getChildren().get(0);
    assertEquals(3, pattern.getConstraints().size());
    IndexableConstraint vconstraint = (IndexableConstraint) pattern.getConstraints().get(1);
    assertEquals(Column.class, vconstraint.getFieldIndex().getExtractor().getExtractToClass());
    assertEquals("column1", vconstraint.getRequiredDeclarations()[0].getIdentifier());
    pattern = (org.drools.core.rule.Pattern) lhs.getChildren().get(3);
    assertEquals(1, pattern.getConstraints().size());
    constraint = pattern.getConstraints().get(0);
    exists = (GroupElement) lhs.getChildren().get(4);
    pattern = (org.drools.core.rule.Pattern) exists.getChildren().get(0);
    assertEquals(3, pattern.getConstraints().size());
    vconstraint = (IndexableConstraint) pattern.getConstraints().get(1);
    assertEquals(Column.class, vconstraint.getFieldIndex().getExtractor().getExtractToClass());
    assertEquals("column2", vconstraint.getRequiredDeclarations()[0].getIdentifier());
    pattern = (org.drools.core.rule.Pattern) lhs.getChildren().get(5);
    assertEquals(1, pattern.getConstraints().size());
    constraint = pattern.getConstraints().get(0);
    exists = (GroupElement) lhs.getChildren().get(6);
    pattern = (org.drools.core.rule.Pattern) exists.getChildren().get(0);
    assertEquals(3, pattern.getConstraints().size());
    vconstraint = (IndexableConstraint) pattern.getConstraints().get(1);
    assertEquals(Column.class, vconstraint.getFieldIndex().getExtractor().getExtractToClass());
    assertEquals("column3", vconstraint.getRequiredDeclarations()[0].getIdentifier());
}