Start with a simple test for a happy path behavior in VE, for example:

Example test case:

• Create a new page containing a reference, via API. See backlinks.js "before" function for an example.
• Open the page for editing in VE.
• Click on the footnote marker.
• Assert that the popup appears and shows the ref content.
• Click the "Edit" button in the popup.
• Assert that a dialog appears with the ref content.

Write this test using the Cypress framework.

There may be some CI infrastructure work required so that the VisualEditor extension is loaded as a dependency of Cite during tests.