Serve csv and pdf files locally (#2946)

Co-authored-by: David Marby <david@dmarby.se>

packages/insomnia-smoke-test/core/app.test.js

@@ -64,7 +64,7 @@ describe('Application launch', function() {
   );
 
   it('sends CSV request and shows rich response', async () => {
-    const url = 'http://127.0.0.1:4010/csv';
+    const url = 'http://127.0.0.1:4010/file/dummy.csv';
 
     await debug.workspaceDropdownExists(app);
     await debug.createNewRequest(app, 'csv');
@@ -77,9 +77,7 @@ describe('Application launch', function() {
   });
 
   it('sends PDF request and shows rich response', async () => {
-    // Cannot mock the pdf response using Prism because it is not yet supported
-    // https://github.com/stoplightio/prism/issues/1248#issuecomment-646056440
-    const url = 'https://www.w3.org/WAI/ER/tests/xhtml/testfiles/resources/pdf/dummy.pdf';
+    const url = 'http://127.0.0.1:4010/file/dummy.pdf';
 
     await debug.workspaceDropdownExists(app);
     await debug.createNewRequest(app, 'pdf');

packages/insomnia-smoke-test/fixtures/dummy.csv

@@ -0,0 +1,2 @@
+a,b,c
+1,2,3

packages/insomnia-smoke-test/server/index.js

@@ -6,7 +6,7 @@ const app = express();
 const basicAuthRouter = express.Router();
 const port = 4010;
 
-// Artificallly slow each request down
+// Artificially slow each request down
 app.use((req, res, next) => {
   setTimeout(next, 500);
 });
@@ -15,12 +15,7 @@ app.get('/pets/:id', (req, res) => {
   res.status(200).send({ id: req.params.id });
 });
 
-app.get('/csv', (_, res) => {
-  res
-    .status(200)
-    .header('content-type', 'text/csv')
-    .send(`a,b,c\n1,2,3`);
-});
+app.use('/file', express.static('fixtures'));
 
 const { utf8, latin1 } = basicAuthCreds;
 
@@ -29,11 +24,7 @@ const users = {
   [latin1.encoded.user]: latin1.encoded.pass,
 };
 
-basicAuthRouter.use(
-  basicAuth({
-    users,
-  }),
-);
+basicAuthRouter.use(basicAuth({ users }));
 
 basicAuthRouter.get('/', (_, res) => {
   res