Add very first HTTP tests

Added tests for "static" pages like Home, Changelog, FAQ, etc.

tests/routes/static-pages.test.js

@@ -0,0 +1,29 @@
+const supertest = require('supertest');
+
+// Mimic https responses to avoid being redirected all the time
+const app = supertest.agent(require('app.js').app)
+    .set('X-Forwarded-Proto', 'https');
+
+describe('Tests for static pages', ()=>{
+	it('Home page works', ()=>{
+		return app.get('/').expect(200);
+	});
+
+	it('Home page v3 works', ()=>{
+		return app.get('/v3_preview').expect(200);
+	});
+
+	it('Changelog page works', ()=>{
+		return app.get('/changelog').expect(200);
+	});
+
+	it('FAQ page works', ()=>{
+		return app.get('/faq').expect(200);
+	});
+
+	// FIXME: robots.txt file can't be properly loaded under testing environment,
+	// most likely due to __dirname being different from what is expected
+	it.skip('robots.txt works', ()=>{
+		return app.get('/robots.txt').expect(200);
+	});
+});