Use IOUtils in PosixPluginFrontendSpec

Author: bell-db

bridge/src/test/scala/protocbridge/frontend/OsSpecificFrontendSpec.scala

@@ -1,5 +1,6 @@
 package protocbridge.frontend
 
+import org.apache.commons.io.IOUtils
 import org.scalatest.flatspec.AnyFlatSpec
 import org.scalatest.matchers.must.Matchers
 import protocbridge.{ExtraEnv, ProtocCodeGenerator}
@@ -30,17 +31,13 @@ class OsSpecificFrontendSpec extends AnyFlatSpec with Matchers {
             writeInput.close()
           },
           processOutput => {
-            val buffer = new Array[Byte](4096)
-            var bytesRead = 0
-            while (bytesRead != -1) {
-              bytesRead = processOutput.read(buffer)
-              if (bytesRead != -1) {
-                actualOutput.write(buffer, 0, bytesRead)
-              }
-            }
+            IOUtils.copy(processOutput, actualOutput)
             processOutput.close()
           },
-          _.close()
+          processError => {
+            IOUtils.copy(processError, System.err)
+            processError.close()
+          }
         )
       )
     process.exitValue()