add cypress confirm-email spec

frontend/blog_portal/cypress/e2e/confirm_email_page.cy.ts

@@ -0,0 +1,48 @@
+describe("confirm email page", function () {
+  beforeEach(function () {
+    cy.resetDb();
+    cy.clearMail();
+  });
+
+  it("redirects to /login when no token is present", function () {
+    cy.visit("/confirm-email");
+    cy.location("pathname").should("eq", "/login");
+  });
+
+  it("sets the password and redirects to /login on success", function () {
+    cy.signupViaApi({
+      email: "alice@example.com",
+      displayName: "alice",
+    });
+    cy.fetchLatestConfirmToken("alice@example.com").then(function (token) {
+      cy.visit(`/confirm-email?token=${token}`);
+      cy.get('input[type="password"]').type("longenoughpassword");
+      cy.contains("button", "Confirm").click();
+
+      cy.location("pathname").should("eq", "/login");
+
+      cy.loginViaApi({
+        email: "alice@example.com",
+        password: "longenoughpassword",
+      });
+    });
+  });
+
+  it("shows the backend error when password is too short", function () {
+    cy.signupViaApi({
+      email: "alice@example.com",
+      displayName: "alice",
+    });
+    cy.fetchLatestConfirmToken("alice@example.com").then(function (token) {
+      cy.visit(`/confirm-email?token=${token}`);
+      cy.get('input[type="password"]')
+        .invoke("removeAttr", "minlength")
+        .type("short");
+      cy.contains("button", "Confirm").click();
+
+      cy.contains(".error", "password must be at least 8").should(
+        "be.visible",
+      );
+    });
+  });
+});