give more time for gc

Author: timfel

graalpython/com.oracle.graal.python.test/src/tests/cpyext/test_gc.py

@@ -129,9 +129,9 @@ def test_native_class(self):
             b = GCTestClass.getCounters()
             assert b == (1,1,0,0)
             del o
-            gc.collect()
-            time.sleep(1)
-            gc.collect()
+            for i in range(4):
+                gc.collect()
+                time.sleep(1)
             c = GCTestClass.getCounters()
             assert c == (1,1,1,1)