fix(Grid toolbar): fix migrations

Signed-off-by: MPopov <[email protected]>

Author: MPopov

projects/igniteui-angular/migrations/update-8_2_6/index.spec.ts

@@ -43,4 +43,41 @@ describe('Update 9.0.0', () => {
             `);
         done();
     });
+
+    it('should update igx-carousel-theme prop', done => {
+        appTree.create(
+            '/testSrc/appPrefix/component/test.component.scss',
+            `$my-toolbar-theme: igx-grid-toolbar-theme(
+                $background-color: null,
+                $button-background: null,
+                $title-text-color: null,
+                $button-text-color: null,
+                $button-hover-background: null,
+                $button-hover-text-color: null,
+                $button-focus-background: null,
+                $button-focus-text-color: null,
+                $dropdown-background: null,
+                $item-text-color: null,
+                $item-hover-background: null,
+                $item-hover-text-color: null,
+                $item-focus-background: null,
+                $item-focus-text-color: null
+              );`
+        );
+        const tree = schematicRunner.runSchematic('migration-12', {}, appTree);
+        expect(tree.readContent('/testSrc/appPrefix/component/test.component.scss'))
+            .toEqual(
+                `$my-toolbar-theme: igx-grid-toolbar-theme(
+                $background-color: null,
+                $title-text-color: null,
+                $dropdown-background: null,
+                $item-text-color: null,
+                $item-hover-background: null,
+                $item-hover-text-color: null,
+                $item-focus-background: null,
+                $item-focus-text-color: null
+              );`
+            );
+        done();
+    });
 });