Add Cypress integration & initial test

.gitignore

@@ -7,4 +7,5 @@ yarn-error.log
 config/config.dev.json
 .yalc/
 yalc.lock
-lib/
+lib/
+cypress/fixtures

cypress.json

@@ -0,0 +1,6 @@
+{
+  "baseUrl": "http://localhost:9000",
+  "video": false,
+  "pluginsFile": false,
+  "supportFile": false
+}

cypress/integration/cluster_spec.js

@@ -0,0 +1,24 @@
+describe('Cluster functionality test', () => {
+  it('adds cluster with valid data', () => {
+    cy.visit('/');
+    cy.get('#add-cluster-btn').then(() => {
+      cy.get('#add-cluster-btn')
+        .first()
+        .click()
+        .then(() => {
+          cy.get('#cluster-name-input')
+            .type('test cluster')
+          cy.get('#url-input')
+            .type('example.com')
+          cy.get('#token-input')
+            .type('123456')
+          cy.get('#check-connection-btn')
+            .click()
+          cy.get('#submit-cluster-btn')
+            .click()
+        })
+    });
+    cy.contains('Add cluster')
+    cy.contains('test cluster')
+  });
+});