fix(runtest.py): Enhance module name handling and improve error messages for missing files

Author: lum1n0us

tests/wamr-test-suites/spec-test-script/runtest.py

@@ -1499,15 +1499,17 @@ def test_assert_with_exception(form, wast_tempfile, wasm_tempfile, aot_tempfile,
                 # get module's new name from the register cmd
                 name_new =re.split('\"',re.search('\".*\"',form).group(0))[1]
                 if name_new:
-                    new_module = os.path.join(tempfile.gettempdir(), name_new + ".wasm")
                     if not name_new in temp_module_table:
-                        print(f"can not find module name {name_new} from the register")
+                        print(f"can not find module name {name_new} from the register, use {wasm_tempfile} instead")
 
                     just_generated = temp_module_table.get(name_new, wasm_tempfile)
                     if not os.path.exists(just_generated):
                         raise Exception("can not find file %s" % just_generated)
 
                     print("f{just_generated} is copied to {new_module}")
+
+                    # copy the just generated module into a file with specific name
+                    new_module = os.path.join(tempfile.gettempdir(), name_new + ".wasm")
                     shutil.copyfile(just_generated, new_module)
 
                     # add new_module copied from the old into temp_file_repo[]