add additional logging in error message to help determine why it fails

Signed-off-by: Jeromy Cannon <[email protected]>

Author: jeromy-cannon

src/core/k8.mjs

@@ -574,6 +574,7 @@ export class K8 {
         const command = ['cat', `${srcDir}/${srcFile}`]
         const writerStream = fs.createWriteStream(tmpFile)
         const errStream = new sb.WritableStreamBuffer()
+        let additionalErrorMessageDetail = ''
 
         execInstance.exec(
           namespace,
@@ -605,12 +606,18 @@ export class K8 {
                 const stat = fs.statSync(destPath)
                 if (stat && stat.size === srcFileSize) {
                   return resolve(true)
+                } else {
+                  if (!stat) {
+                    additionalErrorMessageDetail = ', statSync returned no file status for the destination file'
+                  } else {
+                    additionalErrorMessageDetail = `, stat.size=${stat.size} != srcFileSize=${srcFileSize}`
+                  }
                 }
               } catch (e) {
                 return reject(new FullstackTestingError(`failed to copy file: ${destPath}`, e))
               }
 
-              return reject(new FullstackTestingError(`failed to download file completely: ${destPath}`))
+              return reject(new FullstackTestingError(`failed to download file completely: ${destPath}${additionalErrorMessageDetail}`))
             })
 
             conn.on('error', (e) => {