force dom to clear after each individual test case

[jadeddelta]

this PR clears the dom after every individual test. the expected pattern of using startTimeline in the test-utils package is to deconstruct the tuple given and take out displayElement in order to directly query the experiment's display element. however, some plugins still query document directly, which isn't optimal as the dom is not cleared, meaning there are multiple jsPsych display elements on the dom at a given time. this results in some interesting edge cases where the wrong button is queried, or one test failing means every next test that interacts with the document fails.

this is a small, simple update in order to allow tests to both query document and displayElement without having to deal with this behavior by making sure the DOM is wiped before each individual test.

[changeset-bot]

🦋 Changeset detected

Latest commit: 3de5aad

The changes in this PR will be included in the next version bump.

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Name	Type
@jspsych/config	Minor

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