added unit test for LicenseDropdown component

[codetheorem]

Signed-off-by: Hrishikesh Agarwal hrishikeshagarwalv@gmail.com

Fixes

Fixes #120 by @akmadian

Description

Added unit test for component LicenseDropdown.vue

Technical details

Added snapshot test for the component.

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
• My pull request targets the default branch of the repository (main or master).
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no
  visible errors.

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[obulat]

Great start, @codetheorem ! We should also test that selecting an option emits the corresponding event.

[obulat]

I have changed the test setup a little bit so that we can test that the selected license is committed to the store, and removed i18n setup which is unnecessary for this component.
Thank you for your work!