Cypress tests for soft logout (#11402)

cypress/e2e/login/utils.ts

@@ -0,0 +1,49 @@
+/*
+Copyright 2023 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+/** Visit the login page, choose to log in with "OAuth test", register a new account, and redirect back to Element
+ */
+export function doTokenRegistration(homeserverUrl: string) {
+    cy.visit("/#/login");
+
+    cy.findByRole("button", { name: "Edit" }).click();
+    cy.findByRole("textbox", { name: "Other homeserver" }).type(homeserverUrl);
+    cy.findByRole("button", { name: "Continue" }).click();
+    // wait for the dialog to go away
+    cy.get(".mx_ServerPickerDialog").should("not.exist");
+
+    // click on "Continue with OAuth test"
+    cy.findByRole("button", { name: "Continue with OAuth test" }).click();
+
+    // wait for the Test OAuth Page to load
+    cy.findByText("Test OAuth page");
+
+    // click the submit button
+    cy.findByRole("button", { name: "Submit" }).click();
+
+    // Synapse prompts us to pick a user ID
+    cy.findByRole("heading", { name: "Create your account" });
+    cy.findByRole("textbox", { name: "Username (required)" }).type("alice");
+
+    // wait for username validation to start, and complete
+    cy.wait(50);
+    cy.get("#field-username-output").should("have.value", "");
+    cy.findByRole("button", { name: "Continue" }).click();
+
+    // Synapse prompts us to grant permission to Element
+    cy.findByRole("heading", { name: "Continue to your account" });
+    cy.findByRole("link", { name: "Continue" }).click();
+}