Drop-down field detailed test cases.

Test Scenario 1: Functionality

1. Verify that the dropdown is working as expected.
2. Verify that the dropdown menu appears when the user clicks on the dropdown button.
3. Verify that the dropdown menu disappears when the user clicks outside of the dropdown menu.
4. Verify that the selected option is displayed in the dropdown button.
5. Verify that the user can select any option from the dropdown menu.
6. Verify that the selected option is highlighted in the dropdown menu.
7. Verify that the dropdown menu disappears when the user selects an option.
8. Verify that the selected option is displayed in the dropdown button after the user selects an option.
9. Verify that the dropdown works on different browsers and platforms.
10. Verify that the dropdown works on different screen sizes.

Test Scenario 2: Accessibility

1. Verify that the dropdown is accessible with a keyboard.
2. Verify that the user can open the dropdown menu using the keyboard.
3. Verify that the user can navigate through the dropdown menu using the keyboard.
4. Verify that the user can select an option from the dropdown menu using the keyboard.
5. Verify that the selected option is displayed in the dropdown button after the user selects an option using the keyboard.
6. Verify that the dropdown is accessible for users with disabilities.

Test Scenario 3: Performance

1. Verify that the dropdown menu opens quickly.
2. Verify that the dropdown menu loads quickly.
3. Verify that the dropdown menu does not affect the performance of the website.
4. Verify that the dropdown menu works smoothly and without any lag.

Test Scenario 4: Usability

1. Verify that the dropdown menu is easy to use.
2. Verify that the dropdown menu is intuitive.
3. Verify that the dropdown menu is well-organized.
4. Verify that the user can easily find the option they are looking for.
5. Verify that the user can easily navigate through the dropdown menu.
6. Verify that the dropdown menu does not confuse the user.
7. Verify that the dropdown menu does not distract the user from the main content.