diff --git a/lib/compiler.c b/lib/compiler.c
index 42ee972..bbaf08e 100644
--- a/lib/compiler.c
+++ b/lib/compiler.c
@@ -62,7 +62,6 @@ void compiler_run(compiler_t* compiler, node_t* node)
       assert(node->children.size == 1);
       compiler_run(compiler, node_child(node, 0));
       mod_push_instr(compiler->mod, OP_ASSERT, RZ_NO_PARAM);
-
     } break;
 
     default: {
diff --git a/lib/loader.c b/lib/loader.c
index 068e228..dd9268c 100644
--- a/lib/loader.c
+++ b/lib/loader.c
@@ -16,7 +16,7 @@ void loader_free(loader_t* loader)
   assert(loader);
 }
 
-void loader_ldfile(loader_t* loader, char const* path, int debug)
+int loader_ldfile(loader_t* loader, char const* path, int debug)
 {
   assert(loader);
   str_t source;
@@ -46,7 +46,7 @@ void loader_ldfile(loader_t* loader, char const* path, int debug)
   if (str_empty(&source))
     {
       str_free(&source);
-      return;
+      return -1;
     }
 
   tysy_t tysy;
@@ -104,7 +104,20 @@ void loader_ldfile(loader_t* loader, char const* path, int debug)
         vm_t vm;
         vm_init(&vm, &err);
 
-        vm_exec_mod(&vm, &mod);
+        int status = vm_exec_mod(&vm, &mod);
+
+        if (status != 0)
+          {
+            vm_free(&vm);
+            mod_free(&mod);
+            parser_free(&parser);
+            lexer_free(&lex);
+            str_free(&source);
+            tysy_free(&tysy);
+            err_free(&err);
+
+            return status;
+          }
 
         if (debug)
           {
@@ -142,4 +155,5 @@ void loader_ldfile(loader_t* loader, char const* path, int debug)
     }
 
   err_free(&err);
+  return 0;
 }
diff --git a/lib/loader.h b/lib/loader.h
index 91f39f7..7bd4950 100644
--- a/lib/loader.h
+++ b/lib/loader.h
@@ -10,6 +10,6 @@ typedef struct {
 void loader_init(loader_t* loader);
 void loader_free(loader_t* loader);
 
-void loader_ldfile(loader_t* loader, char const* path, int debug);
+int loader_ldfile(loader_t* loader, char const* path, int debug);
 
 #endif
diff --git a/lib/vm.c b/lib/vm.c
index 6c495cb..15b4875 100644
--- a/lib/vm.c
+++ b/lib/vm.c
@@ -43,7 +43,7 @@ size_t vm_stack_str(vm_t* vm, char* buffer, size_t size)
   return sz;
 }
 
-void vm_exec_mod(vm_t* vm, mod_t* mod)
+int vm_exec_mod(vm_t* vm, mod_t* mod)
 {
   assert(vm);
   vm->pc = 0;
@@ -55,11 +55,13 @@ void vm_exec_mod(vm_t* vm, mod_t* mod)
                                  mod->program.ops[vm->pc],
                                  mod->program.params[vm->pc]);
 
-      if (!status)
+      if (status != 0)
         {
-          return;
+          return status;
         }
     }
+
+  return 0;
 }
 
 int vm_exec_instr(vm_t* vm, mod_t* mod, Opcode op, param_t param)
@@ -102,7 +104,7 @@ int vm_exec_instr(vm_t* vm, mod_t* mod, Opcode op, param_t param)
         {
           fprintf(stderr, "\33[31mASSERT\33[0m[:%d] assertion failed\n",
                   value->line);
-          return 0;
+          return -1;
         }
 
       vm->pc++;
@@ -116,5 +118,5 @@ int vm_exec_instr(vm_t* vm, mod_t* mod, Opcode op, param_t param)
     };
     }
 
-  return 1;
+  return 0;
 }
diff --git a/lib/vm.h b/lib/vm.h
index b93080f..9660207 100644
--- a/lib/vm.h
+++ b/lib/vm.h
@@ -22,7 +22,7 @@ param_t vm_pop(vm_t* vm);
 
 size_t vm_stack_str(vm_t* vm, char* buffer, size_t size);
 
-void vm_exec_mod(vm_t* vm, mod_t* mod);
+int vm_exec_mod(vm_t* vm, mod_t* mod);
 int vm_exec_instr(vm_t* vm, mod_t* mod, Opcode op, param_t param);
 
 #endif
diff --git a/src/main.c b/src/main.c
index b2e9863..bf2f116 100644
--- a/src/main.c
+++ b/src/main.c
@@ -54,7 +54,13 @@ int main(int argc, char** argv)
 
       while (optind < argc)
         {
-          loader_ldfile(&loader, argv[optind++], debug);
+          int status = loader_ldfile(&loader, argv[optind++], debug);
+
+          if (status != 0)
+            {
+              loader_free(&loader);
+              return status;
+            }
         }
 
       loader_free(&loader);
diff --git a/tests/acceptances/assert.roza b/tests/acceptances/assert.roza
new file mode 100644
index 0000000..dfeb590
--- /dev/null
+++ b/tests/acceptances/assert.roza
@@ -0,0 +1 @@
+assert true
\ No newline at end of file
diff --git a/tests/acceptances/run.sh b/tests/acceptances/run.sh
new file mode 100755
index 0000000..077c1f8
--- /dev/null
+++ b/tests/acceptances/run.sh
@@ -0,0 +1,59 @@
+#!/bin/bash
+
+H="========"
+FILES="$(find . -name '*.roza' | sort)"
+TOTAL=0
+PASSED=0
+
+FAILED_LST=""
+PASSED_LST=""
+TRACE_LST=""
+
+for file in $FILES
+do
+    TRACE="$(roza $file 2>&1)"
+    RES=$?
+
+    # echo -en "\e[33m$file\e[0m ... "
+
+    if [ $RES -ne 0 ]
+    then
+        echo
+        echo -e "$file \e[31mfailed\e[0m"
+        echo "$TRACE"
+        echo
+        FAILED_LST="$FAILED_LST $file "
+        TRACE_LST="$TRACE_LST $TRACE "
+    else
+        PASSED=$(($PASSED + 1))
+        PASSED_LST="$PASSED_LST $file"
+    fi
+
+    TOTAL=$(($TOTAL + 1))
+done
+
+echo
+
+if [ $PASSED -eq $TOTAL ]
+then
+    echo -e "\e[32m$H All tests passed $H\e[0m"
+else
+    echo -e "\e[31m$H Some tests failed $H\e[0m"
+fi
+
+echo "PASSED: $PASSED"
+for ok in $PASSED_LST
+do
+    echo -e "\t$ok \e[32mpassed\e[0m"
+done
+
+echo
+
+echo "FAILED: $(($TOTAL - $PASSED))"
+for ko in $FAILED_LST
+do
+    echo -e "\t$ko \e[31mfailed\e[0m"
+done
+
+echo
+echo "TOTAL: $TOTAL"