add DateSelect rendering unit test

www/__tests__/DateSelect.test.tsx

@@ -0,0 +1,19 @@
+import React from 'react';
+import { render, screen } from '@testing-library/react-native';
+import DateSelect from '../js/diary/list/DateSelect';
+
+jest.mock('react-native-safe-area-context', () => ({
+  useSafeAreaInsets: () => ({ bottom: 30, left: 0, right: 0, top: 30 }),
+}));
+jest.spyOn(React, 'useState').mockImplementation((initialValue) => [initialValue, jest.fn()]);
+jest.spyOn(React, 'useEffect').mockImplementation((effect: () => void) => effect());
+
+describe('DateSelect', () => {
+  it('renders correctly', () => {
+    const onChooseMock = jest.fn();
+    const { getByText } = render(<DateSelect mode="range" onChoose={onChooseMock} />);
+
+    expect(screen.getByTestId('button-container')).toBeTruthy();
+    expect(screen.getByTestId('button')).toBeTruthy();
+  });
+});