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/write_before_map.py

@@ -1,12 +1,12 @@
 #!/usr/bin/env python
 
-from __future__ import print_function
-from unicorn import *
-from unicorn.x86_const import *
-
 import regress
 
-X86_CODE64 = "\x90" # NOP
+from unicorn import *
+from unicorn.x86_const import *
+
+
+X86_CODE64 = b"\x90" # NOP
 
 
 class WriteBeforeMap(regress.RegressTest):
@@ -18,7 +18,10 @@ class WriteBeforeMap(regress.RegressTest):
         ADDRESS = 0x1000000
 
         # write machine code to be emulated to memory
-        mu.mem_write(ADDRESS, X86_CODE64)
+        with self.assertRaises(UcError) as raisedEx:
+            mu.mem_write(ADDRESS, X86_CODE64)
+
+        self.assertEqual(UC_ERR_WRITE_UNMAPPED, raisedEx.exception.errno)
 
 
 if __name__ == '__main__':