Refactor memory leak

tests/test_memoryleak.py

@@ -9,6 +9,7 @@
 
 """Glances unitary tests suite for Glances memory leak."""
 
+import time
 import tracemalloc
 
 
@@ -19,18 +20,20 @@ def test_memoryleak(glances_stats_no_history, logger):
     tracemalloc.start()
     # First iterations just to init the stats and fill the memory
     logger.info('Please wait test is filling memory with stats')
-    iteration = 100
+    iteration = 10
     for _ in range(iteration):
         glances_stats_no_history.update()
+        time.sleep(1)
 
     # Then iteration to measure memory leak
     logger.info('Please wait test if a memory leak is detected')
     iteration = 20
     snapshot_begin = tracemalloc.take_snapshot()
     for _ in range(iteration):
         glances_stats_no_history.update()
+        time.sleep(1)
     snapshot_end = tracemalloc.take_snapshot()
     snapshot_diff = snapshot_end.compare_to(snapshot_begin, 'filename')
     memory_leak = sum([s.size_diff for s in snapshot_diff]) // iteration
-    logger.info('Memory consume per iteration: {memory_leak} bytes')
+    logger.info(f'Memory consume per iteration: {memory_leak} bytes')
     assert memory_leak < 1000, f'Memory leak: {memory_leak} bytes'