Tests: using blocking for large output.

test/unit/main.py

@@ -2,6 +2,7 @@ import os
 import re
 import sys
 import time
+import fcntl
 import shutil
 import argparse
 import platform
@@ -316,5 +317,8 @@ class TestUnit(unittest.TestCase):
         TestUnit.detailed = args.detailed
         TestUnit.save_log = args.save_log
 
+        if TestUnit.detailed:
+            fcntl.fcntl(sys.stdout.fileno(), fcntl.F_SETFL, 0)
+
     def _print_path_to_log(self):
         print('Path to unit.log:\n' + self.testdir + '/unit.log')