Test Failing: Build a Markdown Previewer (Front End Libraries Projects)

Test Failing: Build a Markdown Previewer (Front End Libraries Projects)
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#1

Could someone please help me to understand why the tests are failing? What am I doing wrong? Everything seems to be functioning as expected and is named properly.

Is there something I’ve overlooked? Any help would be appreciated. I’ve been trying to figure this out for hours, even redid the project, stripping out packages and changing the UI framework.