Fix to unit test losing process output due to timing issue

Author: Juhani Puurula

UNITTESTS/unit_test/utils.py

@@ -51,8 +51,13 @@ def execute_program(args, error_msg="An error occurred!", success_msg=None):
                                    stdout=subprocess.PIPE,
                                    stderr=subprocess.STDOUT)
 
+        # Output is stripped to remove newline character. logging adds its own
+        # so we avoid double newlines.
+        # Because the process can terminate before the loop has read all lines,
+        # we read the output remnant just in case. Otherwise we lose it.
         while process.poll() is None:
-            logging.info(process.stdout.readline().decode("utf8"))
+            logging.info(process.stdout.readline().decode('utf8').rstrip('\n'))
+        logging.info(process.stdout.read().decode('utf8').rstrip('\n'))
 
         retcode = process.wait()