Fix flakey test (#817)

packages/exec/__tests__/scripts/stdoutputspecial.js

@@ -1,5 +1,8 @@
 //first half of © character
 process.stdout.write(Buffer.from([0xC2]), (err) => {
     //write in the callback so that the second byte is sent separately
-    process.stdout.write(Buffer.from([0xA9])) //second half of © character
+    setTimeout(() => {
+        process.stdout.write(Buffer.from([0xA9])) //second half of © character
+    }, 5000)
+   
 })

packages/exec/src/exec.ts

@@ -82,7 +82,6 @@ export async function getExecOutput(
   stdout += stdoutDecoder.end()
   stderr += stderrDecoder.end()
 
-  //return undefined for stdout/stderr if they are empty
   return {
     exitCode,
     stdout,