test: tsify spec for experimental views api (#19966)

spec-main/api-view-spec.ts

@@ -0,0 +1,15 @@
+import { closeWindow } from './window-helpers'
+import { TopLevelWindow, View } from 'electron'
+
+describe('View', () => {
+  let w: TopLevelWindow
+  afterEach(async () => {
+    await closeWindow(w as any)
+    w = null as unknown as TopLevelWindow
+  })
+
+  it('can be used as content view', () => {
+    w = new TopLevelWindow({ show: false })
+    w.setContentView(new View())
+  })
+})