test: add screenshot tests

Author: ValeraS

src/components/Calendar/__screenshots__/Calendar.test.tsx-screenshots/Visual-tests-dark-with-multi-selected-dates-1-chromium-linux.png

@@ -178,6 +178,7 @@ export const ClearableCalendar = Default.extend({
             <DefaultComponent
                 {...props}
                 value={value}
+                // @ts-expect-error
                 onUpdate={(v: DateTime) => {
                     if (v.isSame(value, 'day')) {
                         setValue(null);

src/components/Calendar/__screenshots__/Calendar.test.tsx-screenshots/Visual-tests-light-with-multi-selected-dates-1-chromium-linux.png

@@ -30,6 +30,21 @@ describe.skipIf(!import.meta.env.VITE_CI).each([['light'], ['dark']])(
             await expect(screen.getByTestId('calendar')).toMatchScreenshot();
         });
 
+        test('with multi-selected dates', async () => {
+            const screen = await render(
+                <Calendar
+                    data-qa="calendar"
+                    selectionMode="multiple"
+                    value={[
+                        dateTime({input: testDate}),
+                        dateTime({input: testDate}).add(3, 'days'),
+                    ]}
+                />,
+                options,
+            );
+            await expect(screen.getByTestId('calendar')).toMatchScreenshot();
+        });
+
         test('with focused date', async () => {
             const screen = await render(
                 <Calendar