tests: rather course (but it works) test coverage for session creation.

*will fail intentionally*

In response to https://github.com/ether/etherpad-lite/issues/4898

src/tests/backend/specs/api/httpRouteSessionCreation.js

@@ -0,0 +1,62 @@
+'use strict';
+
+const assert = require('assert').strict;
+const common = require('../../common');
+const settings = require('../../../../node/utils/Settings');
+const fs = require('fs');
+let agent;
+
+const shouldCreateSession = [
+  '/p/foo',
+  '/p/foo/export/html',
+];
+const shouldNotCreateSession = [
+  '/',
+  '/api/',
+  '/favicon.ico',
+  '/locales.json',
+  '/pluginfw/plugin-definitions.json',
+  '/static/js/pad.js',
+  '/stats/',
+];
+
+const getDatabaseSize = () => {
+  const dbFile = settings.dbSettings.filename;
+  const database = fs.readFileSync(settings.dbSettings.filename, 'utf8');
+  return database.split('\n').length;
+}
+
+describe(__filename, function () {
+  before(async function () { agent = await common.init(); });
+
+  describe('Session Creation on endpoint', function () {
+    if (settings.dbType !== 'dirty') this.skip;
+
+    this.timeout(100);
+
+    for (const endpoint of shouldNotCreateSession) {
+      it(endpoint, async function () {
+        const previousCount = getDatabaseSize();
+        await agent.get(endpoint)
+        .expect(200)
+        .expect(() => {
+          const newCount = getDatabaseSize();
+          assert(newCount === previousCount);
+        })
+      });
+    }
+
+    for (const endpoint of shouldCreateSession) {
+      const previousCount = getDatabaseSize();
+      it(endpoint, async function () {
+        await agent.get(endpoint)
+        .expect(200)
+        .expect(() => {
+          const newCount = getDatabaseSize();
+          assert(newCount > previousCount);
+        })
+      });
+    }
+
+  });
+});