tests(fix): update start-server-and-test, update e2e tests, change build test command at ci

tests/e2e/integration/proxy.spec.js

@@ -0,0 +1,20 @@
+describe('Proxy disabled - local request', () => {
+  it('Change default url with query and make a request to local cat api', () => {
+    cy.seedAndVisit('catapi', '/?url=https://api.thecatapi.com&path=')
+      .get('#url').then((el) => expect(el.val() === 'https://api.thecatapi.com').to.equal(true))
+      .get("#path").then((el) => expect(el.val() === '').to.equal(true))
+      .get('#response-details-wrapper').should($wrapper => {
+        expect($wrapper).to.contain('FAKE Cat API')
+      })
+  })
+})
+
+describe('Proxy enabled - external request', () => {
+  it('Enable the proxy and make a request to the real cat api', () => {
+    cy.enableProxy('/?url=https://api.thecatapi.com&path=')
+      .get('#send').click()
+      .get('#response-details-wrapper').should($wrapper => {
+        expect($wrapper).to.contain('Cat API')
+      })
+  })
+})