Add e2e test for app with cypress

packages/app/cypress/.eslintrc.json

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+{
+  "plugins": ["cypress"],
+  "extends": ["plugin:cypress/recommended"],
+  "rules": {
+    "jest/expect-expect": [
+      "error",
+      {
+        "assertFunctionNames": ["expect", "cy.contains"]
+      }
+    ]
+  }
+}

packages/app/cypress/integration/app.js

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+/*
+ * Copyright 2020 Spotify AB
+ *
+ * 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.
+ */
+
+describe('App', () => {
+  it('should render the welcome page', () => {
+    cy.visit('/');
+    cy.contains('Welcome to Backstage');
+    cy.contains('Getting Started');
+    cy.contains('Quick Links');
+    cy.contains('APIs');
+  });
+
+  it('should display support info when clicking the button', () => {
+    cy.visit('/');
+    cy.findByTestId('support-button').click({ force: true });
+    cy.contains('#backstage');
+  });
+
+  it('should display error message when triggering it', () => {
+    cy.visit('/');
+    cy.findByTestId('error-button').click({ force: true });
+    cy.contains('Error: Oh no!');
+    cy.findByTestId('error-button-close').click({ force: true });
+  });
+
+  it('should be able to login and logout', () => {
+    const name = 'test-name';
+    Cypress.on('window:before:load', win => {
+      win.fetch = cy.stub().resolves({
+        status: 200,
+        json: () => ({ username: 'test name', token: 'token', name }),
+      });
+    });
+
+    cy.visit('/');
+    cy.get('a[href="/login"]').click({ force: true });
+    cy.url().should('include', '/login');
+    cy.contains('Welcome, guest!');
+    cy.contains('Username')
+      .get('input[name=github-username-tf]')
+      .type(name, { force: true });
+    cy.contains('Token')
+      .get('input[name=github-auth-tf]')
+      .type('password', { force: true });
+    cy.findByTestId('github-auth-button').click({ force: true });
+    cy.contains(`Welcome, ${name}!`);
+    cy.contains('Logout').click({ force: true });
+    cy.contains('Welcome, guest!');
+  });
+});

packages/app/cypress/support/index.js

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+/*
+ * Copyright 2020 Spotify AB
+ *
+ * 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.
+ */
+import '@testing-library/cypress/add-commands';