diff --git a/t_func-base_test.go b/t_builtin-base_test.go
similarity index 100%
rename from t_func-base_test.go
rename to t_builtin-base_test.go
diff --git a/t_func-import_test.go b/t_builtin-import_test.go
similarity index 100%
rename from t_func-import_test.go
rename to t_builtin-import_test.go
diff --git a/t_func-math-arith_test.go b/t_builtin-math-arith_test.go
similarity index 100%
rename from t_func-math-arith_test.go
rename to t_builtin-math-arith_test.go
diff --git a/t_func-os_test.go b/t_builtin-os-file_test.go
similarity index 100%
rename from t_func-os_test.go
rename to t_builtin-os-file_test.go
diff --git a/t_func-string_test.go b/t_builtin-string_test.go
similarity index 100%
rename from t_func-string_test.go
rename to t_builtin-string_test.go