Throw error on incorrect download sizes

src/helpers.js

@@ -182,9 +182,13 @@ module.exports.downloadFile = (url, destination, progressCallback, completeCallb
     .get(url, {
       responseType: 'stream',
     })
-    .then((response) => {
+    .then(response => {
-      const stream = fs.createWriteStream(destination);
       const total = parseInt(response.headers['content-length'], 10);
+      if (total === 0) {
+        throw Error('No data available for download');
+      } else {
+        const stream = fs.createWriteStream(destination);
+
         let downloaded = 0;
         response.data.on('data', (chunk) => {
           stream.write(Buffer.from(chunk));
@@ -196,18 +200,25 @@ module.exports.downloadFile = (url, destination, progressCallback, completeCallb
 
         response.data.on('end', () => {
           stream.end(() => {
+            if (downloaded === 0) {
+              throw Error('Received 0 bytes');
+            } else if (downloaded !== total) {
+              throw Error('Received incorrect number of bytes');
+            } else {
               completeCallback();
+            }
           });
         });
 
-      response.data.on('error', (e) => {
+        response.data.on('error', error => {
           stream.end(() => {
-          completeCallback(e);
+            completeCallback(error);
           });
         });
+      }
     })
-    .catch((e)=> {
+    .catch(error => {
-      completeCallback(e);
+      completeCallback(error);
     });
 };