Modify file upload test

Author: danielrearden

src/__tests__/http-test.js

@@ -957,13 +957,13 @@ function runTests(server: Server) {
           uploadFile { originalname, mimetype }
         }`,
         )
-        .attach('file', __filename);
+        .attach('file', Buffer.from('test'), 'test.txt');
 
       expect(JSON.parse(response.text)).to.deep.equal({
         data: {
           uploadFile: {
-            originalname: 'http-test.js',
-            mimetype: 'application/javascript',
+            originalname: 'test.txt',
+            mimetype: 'text/plain',
           },
         },
       });