New: integration test for staging env w/ Puppeteer

- Installs Puppeteer as a dev dependency on package.json.
- Requests a collection of webhint.io staging URLs and saves the response in a
Map() object.
- Iterates over the Map and checks if is there any status different from 200 or
another unknown error.
- If there is any error, throws it to interrupt the test execution

Author: LeoSL

helpers/integration-tests.js

@@ -0,0 +1,53 @@
+const puppeteer = require('puppeteer');
+
+const URLsToVerify = [
+    'https://sonarwhal-staging.azurewebsites.net/',
+    'https://sonarwhal-staging.azurewebsites.net/scanner/',
+    'https://sonarwhal-staging.azurewebsites.net/search/?q=bla',
+    'https://sonarwhal-staging.azurewebsites.net/about/changelog/1',
+    'https://sonarwhal-staging.azurewebsites.net/docs/user-guide/hints/'
+];
+
+puppeteer.launch()
+    .then((browser) => {
+        const responseCollection = new Promise((resolve) => {
+            const responses = new Map();
+
+            URLsToVerify.forEach((url, index) => {
+                browser.newPage()
+                    .then((page) => {
+                        page.goto(url)
+                            .then((response) => {
+                                responses.set(url, response.status());
+                            })
+                            .catch((error) => {
+                                responses.set(url, `❌ ${error}`);
+                            })
+                            .finally(() => {
+                                if (index === (URLsToVerify.length - 1)) {
+                                    resolve(responses);
+                                    browser.close();
+                                }
+                            });
+                    })
+                    .catch((err) => {
+                        console.log(`Error on Puppeteer's newPage() function. Info: ${err}`);
+                    });
+            });
+        });
+
+        responseCollection.then((responses) => {
+            for (const [url, response] of responses) {
+                if (response !== 200) {
+                    const error = typeof response === 'number' ? `RESPONSE STATUS => ${response}` : response;
+
+                    throw new Error(`❌ Test failed! A request to the URL ${url} has returned the following error: ${error}`);
+                }
+
+                console.log(`✅ Success! ${url} => Status: ${response}`);
+            }
+        });
+    })
+    .catch((err) => {
+        console.log(`Error on launching Puppeteer. Info: ${err}`);
+    });

package.json

@@ -58,6 +58,7 @@
     "mktemp": "^1.0.0",
     "normalize-path": "^3.0.0",
     "npm-run-all": "^4.1.3",
+    "puppeteer": "1.20.0",
     "remove-markdown": "^0.3.0",
     "shelljs": "^0.8.3",
     "stylelint": "^11.0.0",