test(filtering): reset expression when condition is unary

Author: zhosti

projects/igniteui-angular/src/lib/grids/filtering/base/grid-filtering-row.component.ts

@@ -73,7 +73,7 @@ export class IgxGridFilteringRowComponent implements AfterViewInit, OnDestroy {
             const index = this.expressionsList.findIndex(item => item.expression === this.expression);
             if (index === 0 && this.expressionsList.length === 1) {
                 this.filteringService.clearFilter(this.column.field);
-                
+
                 if (this.expression.condition.isUnary) {
                     this.resetExpression();
                 }

projects/igniteui-angular/src/lib/grids/grid/grid-filtering-ui.spec.ts

@@ -2073,11 +2073,24 @@ describe('IgxGrid - Filtering Row UI actions #grid', () => {
             grid.filteringRow.onClearClick();
             tick(100);
             fix.detectChanges();
-            console.log(grid.filteringRow.expression.condition.name);
 
             expect(grid.filteringRow.expression.condition.name).toEqual('startsWith');
         }));
 
+        it('should reset expression when the condition is unary', fakeAsync(() => {
+            GridFunctions.clickFilterCellChip(fix, 'ProductName');
+
+            // iterate over unary conditions
+            // empty
+            GridFunctions.openFilterDDAndSelectCondition(fix, 6);
+
+            grid.filteringRow.onClearClick();
+            tick(100);
+            fix.detectChanges();
+
+            expect(grid.filteringRow.expression.condition.name).toEqual('contains');
+        }));
+
         it('Should filter by cells formatted data when using FormattedValuesFilteringStrategy', fakeAsync(() => {
             const formattedStrategy = new FormattedValuesFilteringStrategy(['Downloads']);
             grid.filterStrategy = formattedStrategy;