fix: prepare document in setup

[ph-fritsche]

What:

Call prepareDocument in setup

Checklist:

• Ready to be merged

[codesandbox-ci]

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Latest deployment of this branch, based on commit 42eaf0f:

Sandbox	Source
userEvent-PR-template	Configuration

[codecov]

Codecov Report

Merging #753 (42eaf0f) into userEvent14 (9519979) will not change coverage.
The diff coverage is 100.00%.

@@              Coverage Diff               @@
##           userEvent14      #753    +/-   ##
==============================================
  Coverage       100.00%   100.00%            
==============================================
  Files               50        66    +16     
  Lines              965      1330   +365     
  Branches           389       502   +113     
==============================================
+ Hits               965      1330   +365     

Impacted Files	Coverage Δ
src/tab.ts	100.00% <ø> (ø)
src/upload.ts	100.00% <ø> (ø)
src/document/applyNative.ts	100.00% <100.00%> (ø)
src/document/index.ts	100.00% <100.00%> (ø)
src/document/interceptor.ts	100.00% <100.00%> (ø)
src/document/selection.ts	100.00% <100.00%> (ø)
src/document/value.ts	100.00% <100.00%> (ø)
src/index.ts	100.00% <100.00%> (ø)
src/keyboard/getNextKeyDef.ts	100.00% <100.00%> (ø)
src/keyboard/index.ts	100.00% <100.00%> (ø)
... and 32 more

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