Adding test to check "Smooth image" option (#4015)

Co-authored-by: dvkruchinin <dvkruchinin@gmail.com>

tests/cypress/integration/actions_tasks/case_110_settings_smooth_image_option.js

@@ -0,0 +1,28 @@
+// Copyright (C) 2021 Intel Corporation
+//
+// SPDX-License-Identifier: MIT
+
+/// <reference types="cypress" />
+
+import { taskName } from '../../support/const';
+
+context('Settings. "Smooth image" option.', () => {
+    const caseId = '110';
+
+    before(() => {
+        cy.openTaskJob(taskName);
+    });
+
+    describe(`Testing case "${caseId}"`, () => {
+        it('Check "Smooth image" option.', () => {
+            cy.get('#cvat_canvas_background').should('not.have.class', 'cvat_canvas_pixelized');
+            cy.openSettings();
+            cy.get('.cvat-player-settings-smooth-image-checkbox')
+                .find('[type="checkbox"]')
+                .should('be.checked')
+                .click()
+                .should('not.be.checked');
+            cy.get('#cvat_canvas_background').should('have.class', 'cvat_canvas_pixelized');
+        });
+    });
+});