chore: adding test for selectFile() in multi-domain (#19786)

cli/types/cypress-eventemitter.d.ts

@@ -30,4 +30,4 @@ interface NodeEventEmitter {
 
 // We use the Buffer class for dealing with binary data, especially around the
 // selectFile interface.
-type BufferType = import("buffer/").Buffer
+type BufferType = typeof import("buffer/").Buffer

packages/driver/cypress/fixtures/multi-domain.html

@@ -16,6 +16,7 @@
     <a data-cy="scrolling-link" href="http://www.foobar.com:3500/fixtures/scrolling.html">http://www.foobar.com:3500/fixtures/scrolling.html</a>
     <a data-cy="request-link" href="http://www.foobar.com:3500/fixtures/request.html">http://www.foobar.com:3500/fixtures/request.html</a>
     <a data-cy="shadow-dom-link" href="http://www.foobar.com:3500/fixtures/shadow-dom.html">http://www.foobar.com:3500/fixtures/shadow-dom.html</a>
+    <a data-cy="files-form-link" href="http://www.foobar.com:3500/fixtures/files-form.html">http://www.foobar.com:3500/fixtures/files-form.html</a>
   </div>
 </body>
 </html>

packages/driver/cypress/integration/e2e/multi-domain/commands/multi_domain_actions.spec.ts

@@ -138,8 +138,33 @@ context('multi-domain actions', { experimentalSessionSupport: true, experimental
     cy.switchToDomain('foobar.com', done, () => {
       const $btn = cy.$$('#button')
 
-      $btn.on('click', (e) => done())
+      $btn.on('click', () => done())
       cy.get('#button').trigger('click')
     })
   })
+
+  it('.selectFile()', () => {
+    cy.get('a[data-cy="files-form-link"]').click()
+
+    cy.switchToDomain('foobar.com', () => {
+      cy.wrap(Cypress.Buffer.from('foo')).as('foo')
+
+      cy.get('#basic')
+      .selectFile({ contents: '@foo', fileName: 'foo.txt' })
+      .should(($input) => {
+        const input = $input[0] as HTMLInputElement
+        const file = input!.files![0]
+
+        expect(file.name).to.equal('foo.txt')
+
+        return file.arrayBuffer()
+        .then((arrayBuffer) => {
+          const decoder = new TextDecoder('utf8')
+          const contents = decoder.decode(arrayBuffer)
+
+          expect(contents).to.equal('foo')
+        })
+      })
+    })
+  })
 })

packages/driver/cypress/integration/e2e/multi-domain/commands/multi_domain_misc.spec.ts

@@ -7,7 +7,7 @@ context('multi-domain misc', { experimentalSessionSupport: true, experimentalMul
 
   it('verifies number of cy commands', () => {
     // @ts-ignore
-    expect(Object.keys(cy.commandFns).length).to.equal(85,
+    expect(Object.keys(cy.commandFns).length).to.equal(86,
       'The number of cy commands has changed. Please ensure any newly added commands are also tested in multi-domain.')
   })