Tests if AttributionDetailsStep component is mounted correctly

[JackieBinya]

Fixes #112

Description

• This PR adds a unit test, to test whether the AttributionDetailsStep Component is rendered correctly

Other information

• This is my first PR, I am trying to make sure that I followed best practices and the test I wrote so far meets expectations.
• I would love to add more tests that test if that the state is correctly updated if a user fills in the input fields

Checklist

• ✅ My pull request has a descriptive title (not a vague title like Update index.md).
• ✅ My pull request targets the master branch of the repository.
• ✅ My commit messages follow best practices.
• ✅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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[akmadian]

Hey Jackie, this is a good start! Jest coverage is showing lines 48, 57, 63, 69, and 75 as being uncovered, which means that it thinks there are tests that should be written for those lines, but there aren't. Please try adding tests for the uncovered lines

When writing tests for the computed props, please use the mocked VueX state to ensure the mutations are working properly :)

[akmadian]

Looks good! Thanks for working on this!

[akmadian]

This may be a bit much, a lot of things being checked are static and always rendered since they're right there in the markdown, but I think it's ok for now