Adding test for issue #204

Adding test for issue #204

Author: MayaKirova

tests/unit/igcombo/combo.spec.ts

@@ -66,6 +66,25 @@ export function main() {
                 }, 10);
             });
         });
+         it('should be updated correctly if the ngModel value is cleared.', (done) => {
+                var template = '<div><ig-combo [(widgetId)]="comboID" [(options)]="options" [changeDetectionInterval]="cdi" [(ngModel)]="combo.value1"></ig-combo></div>';
+                TestBed.overrideComponent(TestComponent, {
+                    set: {
+                        template: template
+                    }
+                });
+            TestBed.compileComponents().then(() => {
+                let fixture = TestBed.createComponent(TestComponent);
+                fixture.detectChanges();
+                //clear
+                $("#combo1").find(".ui-igcombo-clearicon").click();
+                fixture.detectChanges();
+                setTimeout(function () {
+                    expect(fixture.componentInstance.combo.value1 instanceof Array && fixture.componentInstance.combo.value1.length === 0).toBeTruthy();
+                    done();
+                }, 10);
+            });
+          });
 
         it('the ngModel should be updated correctly if the combo selection is updated', (done) => {
             var template = '<div><ig-combo [(widgetId)]="comboID" [(options)]="options" [changeDetectionInterval]="cdi" [(ngModel)]="combo.value1"></ig-combo></div>';