diff --git a/test/simple-memory-corruption/test_smc.py b/test/simple-memory-corruption/test_smc.py
index a1f3adc..182dc6b 100644
--- a/test/simple-memory-corruption/test_smc.py
+++ b/test/simple-memory-corruption/test_smc.py
@@ -18,33 +18,33 @@ class TestSimpleMemoryCorruption(unittest.TestCase):
     def test_delete_type_size_mismatch(self):
         _stdout, stderr, returncode = self.run_test(
             "delete_type_size_mismatch")
-        self.assertEqual(abs(returncode), 6)
+        self.assertEqual(returncode, -6)
         self.assertEqual(stderr.decode(
             "utf-8"), "fatal allocator error: sized deallocation mismatch (small)\n")
 
     def test_double_free_large_delayed(self):
         _stdout, stderr, returncode = self.run_test(
             "double_free_large_delayed")
-        self.assertEqual(abs(returncode), 6)
+        self.assertEqual(returncode, -6)
         self.assertEqual(stderr.decode("utf-8"),
                          "fatal allocator error: invalid free\n")
 
     def test_double_free_large(self):
         _stdout, stderr, returncode = self.run_test("double_free_large")
-        self.assertEqual(abs(returncode), 6)
+        self.assertEqual(returncode, -6)
         self.assertEqual(stderr.decode("utf-8"),
                          "fatal allocator error: invalid free\n")
 
     def test_double_free_small_delayed(self):
         _stdout, stderr, returncode = self.run_test(
             "double_free_small_delayed")
-        self.assertEqual(abs(returncode), 6)
+        self.assertEqual(returncode, -6)
         self.assertEqual(stderr.decode("utf-8"),
                          "fatal allocator error: double free (quarantine)\n")
 
     def test_double_free_small(self):
         _stdout, stderr, returncode = self.run_test("double_free_small")
-        self.assertEqual(abs(returncode), 6)
+        self.assertEqual(returncode, -6)
         self.assertEqual(stderr.decode("utf-8"),
                          "fatal allocator error: double free (quarantine)\n")
 
@@ -56,39 +56,39 @@ class TestSimpleMemoryCorruption(unittest.TestCase):
     def test_eight_byte_overflow_small(self):
         _stdout, stderr, returncode = self.run_test(
             "eight_byte_overflow_small")
-        self.assertEqual(abs(returncode), 6)
+        self.assertEqual(returncode, -6)
         self.assertEqual(stderr.decode("utf-8"),
                          "fatal allocator error: canary corrupted\n")
 
     def test_invalid_free_protected(self):
         _stdout, stderr, returncode = self.run_test("invalid_free_protected")
-        self.assertEqual(abs(returncode), 6)
+        self.assertEqual(returncode, -6)
         self.assertEqual(stderr.decode("utf-8"),
                          "fatal allocator error: invalid free\n")
 
     def test_invalid_free_small_region_far(self):
         _stdout, stderr, returncode = self.run_test(
             "invalid_free_small_region_far")
-        self.assertEqual(abs(returncode), 6)
+        self.assertEqual(returncode, -6)
         self.assertEqual(stderr.decode(
             "utf-8"), "fatal allocator error: invalid free within a slab yet to be used\n")
 
     def test_invalid_free_small_region(self):
         _stdout, stderr, returncode = self.run_test(
             "invalid_free_small_region")
-        self.assertEqual(abs(returncode), 6)
+        self.assertEqual(returncode, -6)
         self.assertEqual(stderr.decode("utf-8"),
                          "fatal allocator error: double free\n")
 
     def test_invalid_free_unprotected(self):
         _stdout, stderr, returncode = self.run_test("invalid_free_unprotected")
-        self.assertEqual(abs(returncode), 6)
+        self.assertEqual(returncode, -6)
         self.assertEqual(stderr.decode("utf-8"),
                          "fatal allocator error: invalid free\n")
 
     def test_read_after_free_large(self):
         _stdout, _stderr, returncode = self.run_test("read_after_free_large")
-        self.assertEqual(abs(returncode), 11)
+        self.assertEqual(returncode, -11)
 
     def test_read_after_free_small(self):
         stdout, _stderr, returncode = self.run_test("read_after_free_small")
@@ -98,7 +98,7 @@ class TestSimpleMemoryCorruption(unittest.TestCase):
 
     def test_read_zero_size(self):
         _stdout, _stderr, returncode = self.run_test("read_zero_size")
-        self.assertEqual(abs(returncode), 11)
+        self.assertEqual(returncode, -11)
 
     def test_string_overflow(self):
         stdout, _stderr, returncode = self.run_test("string_overflow")
@@ -107,58 +107,58 @@ class TestSimpleMemoryCorruption(unittest.TestCase):
 
     def test_unaligned_free_large(self):
         _stdout, stderr, returncode = self.run_test("unaligned_free_large")
-        self.assertEqual(abs(returncode), 6)
+        self.assertEqual(returncode, -6)
         self.assertEqual(stderr.decode("utf-8"),
                          "fatal allocator error: invalid free\n")
 
     def test_unaligned_free_small(self):
         _stdout, stderr, returncode = self.run_test("unaligned_free_small")
-        self.assertEqual(abs(returncode), 6)
+        self.assertEqual(returncode, -6)
         self.assertEqual(stderr.decode("utf-8"),
                          "fatal allocator error: invalid unaligned free\n")
 
     def test_uninitialized_free(self):
         _stdout, stderr, returncode = self.run_test("uninitialized_free")
-        self.assertEqual(abs(returncode), 6)
+        self.assertEqual(returncode, -6)
         self.assertEqual(stderr.decode("utf-8"),
                          "fatal allocator error: invalid free\n")
 
     def test_uninitialized_malloc_usable_size(self):
         _stdout, _stderr, returncode = self.run_test(
             "uninitialized_malloc_usable_size")
-        self.assertEqual(abs(returncode), 11)
+        self.assertEqual(returncode, -11)
 
     def test_uninitialized_realloc(self):
         _stdout, stderr, returncode = self.run_test("uninitialized_realloc")
-        self.assertEqual(abs(returncode), 6)
+        self.assertEqual(returncode, -6)
         self.assertEqual(stderr.decode("utf-8"),
                          "fatal allocator error: invalid realloc\n")
 
     def test_write_after_free_large_reuse(self):
         _stdout, _stderr, returncode = self.run_test(
             "write_after_free_large_reuse")
-        self.assertEqual(abs(returncode), 11)
+        self.assertEqual(returncode, -11)
 
     def test_write_after_free_large(self):
         _stdout, _stderr, returncode = self.run_test("write_after_free_large")
-        self.assertEqual(abs(returncode), 11)
+        self.assertEqual(returncode, -11)
 
     def test_write_after_free_small_reuse(self):
         _stdout, stderr, returncode = self.run_test(
             "write_after_free_small_reuse")
-        self.assertEqual(abs(returncode), 6)
+        self.assertEqual(returncode, -6)
         self.assertEqual(stderr.decode("utf-8"),
                          "fatal allocator error: detected write after free\n")
 
     def test_write_after_free_small(self):
         _stdout, stderr, returncode = self.run_test("write_after_free_small")
-        self.assertEqual(abs(returncode), 6)
+        self.assertEqual(returncode, -6)
         self.assertEqual(stderr.decode("utf-8"),
                          "fatal allocator error: detected write after free\n")
 
     def test_write_zero_size(self):
         _stdout, _stderr, returncode = self.run_test("write_zero_size")
-        self.assertEqual(abs(returncode), 11)
+        self.assertEqual(returncode, -11)
 
 
 if __name__ == '__main__':