diff --git a/tests/unit/test_mem.c b/tests/unit/test_mem.c
index c8c54077..008ec146 100644
--- a/tests/unit/test_mem.c
+++ b/tests/unit/test_mem.c
@@ -4,7 +4,16 @@ static void test_map_correct() {
     uc_engine* uc;
 
     OK(uc_open (UC_ARCH_X86, UC_MODE_64, &uc));
-    OK(uc_mem_map (uc, 0x40000, 0x1000 * 16, UC_PROT_ALL));
+    OK(uc_mem_map (uc, 0x40000, 0x1000 * 16, UC_PROT_ALL)); // [0x40000, 0x50000]
+    OK(uc_mem_map (uc, 0x60000, 0x1000 * 16, UC_PROT_ALL)); // [0x60000, 0x70000]
+    OK(uc_mem_map (uc, 0x20000, 0x1000 * 16, UC_PROT_ALL)); // [0x20000, 0x30000]
+    uc_assert_err(UC_ERR_MAP, uc_mem_map(uc, 0x10000, 0x2000 * 16, UC_PROT_ALL));
+    uc_assert_err(UC_ERR_MAP, uc_mem_map(uc, 0x25000, 0x1000 * 16, UC_PROT_ALL));
+    uc_assert_err(UC_ERR_MAP, uc_mem_map(uc, 0x35000, 0x1000 * 16, UC_PROT_ALL));
+    uc_assert_err(UC_ERR_MAP, uc_mem_map(uc, 0x45000, 0x1000 * 16, UC_PROT_ALL));
+    uc_assert_err(UC_ERR_MAP, uc_mem_map(uc, 0x55000, 0x2000 * 16, UC_PROT_ALL));
+    OK(uc_mem_map(uc, 0x35000, 0x5000, UC_PROT_ALL));
+    OK(uc_mem_map(uc, 0x50000, 0x5000, UC_PROT_ALL));
 
     OK(uc_close(uc));
 }