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/bad_ram.py

@@ -1,29 +1,33 @@
 #!/usr/bin/python
 
+import regress
+
 from unicorn import *
 from unicorn.x86_const import *
 
-import regress
-
 
 class Hang(regress.RegressTest):
-
     def runTest(self):
         PAGE_SIZE = 0x5000
         CODE_ADDR = 0x400000
         RSP_ADDR =  0x200000
-        binary1 = "\xCA\x24\x5D" # retf 0x5d24
+
+        CODE = b"\xCA\x24\x5D" # retf 0x5d24
+
         mu = Uc(UC_ARCH_X86, UC_MODE_64)
 
         mu.mem_map(CODE_ADDR, PAGE_SIZE)
         mu.mem_map(RSP_ADDR, PAGE_SIZE)
 
-        mu.mem_write(CODE_ADDR, binary1)
+        mu.mem_write(CODE_ADDR, CODE)
         mu.reg_write(UC_X86_REG_RSP, RSP_ADDR)
-        try:
-            self.assertEqual(mu.emu_start(CODE_ADDR, CODE_ADDR + PAGE_SIZE, 0), UC_ERR_FETCH_INVALID)
-        except UcError as e:
-            print("ERROR: %s" % e)
+
+        # make sure we bump into an exception
+        with self.assertRaises(UcError) as raisedEx:
+            mu.emu_start(CODE_ADDR, CODE_ADDR + PAGE_SIZE)
+
+        # make sure it is an exception with the errno we expect
+        self.assertEqual(raisedEx.exception.errno, UC_ERR_READ_UNMAPPED)
 
 
 if __name__ == '__main__':