chore(*): update failing tests

Author: nrobakova

projects/igniteui-angular/src/lib/grids/tree-grid/tree-grid-expanding.spec.ts

@@ -945,7 +945,7 @@ describe('IgxTreeGrid - Expanding / Collapsing #tGrid', () => {
                 TreeGridFunctions.verifyTreeRowIndicator(row, false);
                 expect(rows.length).toBe(3);
 
-                const indicatorDiv = TreeGridFunctions.getExpansionIndicatorDiv(row);
+                let indicatorDiv = TreeGridFunctions.getExpansionIndicatorDiv(row);
                 indicatorDiv.triggerEventHandler('click', new Event('click'));
                 await wait(500);
                 fix.detectChanges();
@@ -959,6 +959,7 @@ describe('IgxTreeGrid - Expanding / Collapsing #tGrid', () => {
                 rows = TreeGridFunctions.getAllRows(fix);
                 TreeGridFunctions.verifyTreeRowIndicator(row, false);
                 expect(rows.length).toBe(5);
+                indicatorDiv = TreeGridFunctions.getExpansionIndicatorDiv(row);
                 indicatorDiv.triggerEventHandler('click', new Event('click'));
                 await wait(16);
                 fix.detectChanges();
@@ -1035,7 +1036,7 @@ describe('IgxTreeGrid - Expanding / Collapsing #tGrid', () => {
                 TreeGridFunctions.verifyTreeRowIndicator(row, false);
                 expect(rows.length).toBe(3);
 
-                const indicatorDiv = TreeGridFunctions.getExpansionIndicatorDiv(row);
+                let indicatorDiv = TreeGridFunctions.getExpansionIndicatorDiv(row);
                 indicatorDiv.triggerEventHandler('click', new Event('click'));
                 fix.detectChanges();
                 await wait(500);
@@ -1051,6 +1052,7 @@ describe('IgxTreeGrid - Expanding / Collapsing #tGrid', () => {
                 rows = TreeGridFunctions.getAllRows(fix);
                 TreeGridFunctions.verifyTreeRowIndicator(row, false);
                 expect(rows.length).toBe(5);
+                indicatorDiv = TreeGridFunctions.getExpansionIndicatorDiv(row);
                 indicatorDiv.triggerEventHandler('click', new Event('click'));
                 fix.detectChanges();
                 await wait(16);
@@ -1099,7 +1101,7 @@ describe('IgxTreeGrid - Expanding / Collapsing #tGrid', () => {
                 TreeGridFunctions.verifyTreeRowIndicator(secondRow, false, false);
                 expect(rows.length).toBe(3);
 
-                const indicatorDiv = TreeGridFunctions.getExpansionIndicatorDiv(firstRow);
+                let indicatorDiv = TreeGridFunctions.getExpansionIndicatorDiv(firstRow);
                 indicatorDiv.triggerEventHandler('click', new Event('click'));
                 await wait(500);
                 fix.detectChanges();
@@ -1113,6 +1115,7 @@ describe('IgxTreeGrid - Expanding / Collapsing #tGrid', () => {
                 rows = TreeGridFunctions.getAllRows(fix);
                 TreeGridFunctions.verifyTreeRowIndicator(firstRow, false);
                 expect(rows.length).toBe(5);
+                indicatorDiv = TreeGridFunctions.getExpansionIndicatorDiv(firstRow);
                 indicatorDiv.triggerEventHandler('click', new Event('click'));
                 await wait(16);
                 fix.detectChanges();