EditorView

Lookup

import { EditorView } from 'vscode-extension-tester';
...
const editorView = new EditorView();

Select an Editor Tab

// open editor tab by title
const editor = await editorView.openEditorTab('package.json');

Closing Editors

// close an editor tab by title
await editorView.closeEditor('package.json');
// close all open tabs
await editorView.closeAllEditors();

Retrieve Open Tab Titles

const titles = await editorView.getOpenEditorTitles();