Revamp Python regression tests suite (#2022)

* Fix Python regression test suite (partial)

* Fix Python regression test suite

* Add a test for mapping at high addresses

* Add ctl tests

tests/regress/potential_memory_leak.py

@@ -2,10 +2,12 @@
 
 import platform
 import resource
+import regress
 
 from unicorn import *
 
-import regress
+
+ITERATIONS = 10000
 
 class MemoryLeak(regress.RegressTest):
     def test(self):
@@ -15,15 +17,20 @@ class MemoryLeak(regress.RegressTest):
             rusage_multiplier = 1024
         else:
             # resource.getrusage(...) is platform dependent. Only tested under OS X and Linux.
-            return
+            self.skipTest('not OSx neither Linux')
+
         max_rss_before = resource.getrusage(resource.RUSAGE_SELF).ru_maxrss * rusage_multiplier
-        for i in xrange(10000):
+
+        for _ in range(ITERATIONS):
             mu = Uc(UC_ARCH_X86, UC_MODE_64)
-            mu.mem_map(0, 4096)
+            mu.mem_map(0, 0x1000)
             mu.emu_start(0, 0)
+
         max_rss_after = resource.getrusage(resource.RUSAGE_SELF).ru_maxrss * rusage_multiplier
-        rss_increase_per_iteration = (max_rss_after - max_rss_before) / i
-        self.assertLess(rss_increase_per_iteration, 8000)
+        rss_increase_per_iteration = (max_rss_after - max_rss_before) / ITERATIONS
+
+        self.assertLess(rss_increase_per_iteration, 8000.0)
+
 
 if __name__ == '__main__':
     regress.main()