Give LeakTest more time for GC

Author: fangerer

graalpython/com.oracle.graal.python.test/src/com/oracle/graal/python/test/advance/LeakTest.java

@@ -185,11 +185,6 @@ private MBeanServer doFullGC() {
             // do this a few times to dump a small heap if we can
             MBeanServer server = null;
             for (int i = 0; i < 10; i++) {
-                try {
-                    Thread.sleep(1000);
-                } catch (InterruptedException e1) {
-                    // do nothing
-                }
                 System.gc();
                 Runtime.getRuntime().freeMemory();
                 server = ManagementFactory.getPlatformMBeanServer();
@@ -199,6 +194,11 @@ private MBeanServer doFullGC() {
                 } catch (MalformedObjectNameException | InstanceNotFoundException | ReflectionException | MBeanException e) {
                     throw new RuntimeException(e);
                 }
+                try {
+                    Thread.sleep(3000);
+                } catch (InterruptedException e1) {
+                    // do nothing
+                }
             }
             return server;
         }