feat(refresh-endpoint): Add e2e integration tests

e2e-tests/development-runtime/cypress/integration/functionality/refresh-endpoint.js

@@ -0,0 +1,73 @@
+describe(`When the refresh endpoint is hit`, () => {
+  afterEach(() => {
+    waitUntilRefreshFinishes()
+  })
+
+  describe(`and accessing any page while refreshing`, () => {
+    it(`the page shown should be restarting page for 404 page`, () => {
+      cy.request(`/non-existing`).then(response => {
+        expect(response.body).not.to.include(`<title>Restarting...</title>`)
+      })
+      cy.request(`POST`, `/__refresh`)
+      cy.request(`/non-existing`).then(response => {
+        expect(response.body).to.include(`<title>Restarting...</title>`)
+      })
+    })
+
+    it(`the page shown should be restarting page for existing pages`, () => {
+      cy.request(`/page-2/`).then(response => {
+        expect(response.body).not.to.include(`<title>Restarting...</title>`)
+      })
+      cy.request(`POST`, `/__refresh`)
+      cy.request(`/page-2/`).then(response => {
+        expect(response.body).to.include(`<title>Restarting...</title>`)
+      })
+    })
+  })
+
+  describe(`and it was not already refreshing`, () => {
+    it(`should return empty body`, () => {
+      cy.request(`POST`, `/__refresh`).then(response => {
+        expect(response.body).to.be.equal(``)
+      })
+    })
+  })
+  describe(`and it was already refreshing`, () => {
+    it(`should put new requests with unique body in a queue`, () => {
+      cy.request(`POST`, `/__refresh`).then(response => {
+        expect(response.body).to.be.equal(``)
+      })
+      cy.request(`POST`, `/__refresh`).then(response => {
+        expect(response.body).to.include(`queued`)
+      })
+      cy.request(`POST`, `/__refresh`).then(response => {
+        expect(response.body).to.include(`already queued`)
+      })
+      cy.request(`POST`, `/__refresh`, `otherBody`).then(response => {
+        expect(response.body).to.include(`queued`)
+      })
+      cy.request(`POST`, `/__refresh`, `otherBody`).then(response => {
+        expect(response.body).to.include(`already queued`)
+      })
+    })
+  })
+})
+
+function waitUntilRefreshFinishes() {
+  cy.waitUntil(
+    () =>
+      cy
+        .request(`/`)
+        .then(
+          response => !response.body.includes(`<title>Restarting...</title>`)
+        ),
+    {
+      timeout: 60000,
+      interval: 2000,
+    }
+  )
+
+  cy.request(`/`).then(response => {
+    expect(response.body).not.to.include(`<title>Restarting...</title>`)
+  })
+}

e2e-tests/development-runtime/cypress/support/commands.js

@@ -1,4 +1,5 @@
 import "@testing-library/cypress/add-commands"
+import "cypress-wait-until"
 
 Cypress.Commands.add(`lifecycleCallCount`, action =>
   cy

e2e-tests/development-runtime/package.json

@@ -46,6 +46,7 @@
     "@testing-library/cypress": "^4.0.4",
     "cross-env": "^5.2.0",
     "cypress": "3.4.1",
+    "cypress-wait-until": "1.7.1",
     "fs-extra": "^7.0.1",
     "gatsby-cypress": "^0.1.7",
     "is-ci": "^2.0.0",