tests/wf/echo.cwl: encode string to bytes before writing to binary file

Author: manu-chroma

tests/wf/echo.cwl

@@ -12,7 +12,8 @@ inputs:
         exit(1)
       else:
         f = open("foo"+sys.argv[1]+".txt", "wb")
-        f.write(sys.argv[1]+"\n")
+        content = sys.argv[1]+"\n"
+        f.write(content.encode('utf-8'))
       if sys.argv[1] == "5":
         exit(1)
 outputs: