tests for result wrapping

src/delta_barth/errors.py

@@ -119,7 +119,7 @@ class StatusHandler:
         upper_bound = DEFAULT_API_ERR_CODE
         if code < lower_bound or code > upper_bound:
             raise ValueError(
-                f"Custom error codes mus be between default "
+                f"Custom error codes must be between default "
                 f"values of {lower_bound}-{upper_bound}"
             )
 
@@ -144,7 +144,7 @@ class StatusHandler:
             api_server_error=error,
         )
 
-    def unwrap(
+    def raise_for_status(
         self,
         state: Status,
     ) -> None:
@@ -191,6 +191,10 @@ class ResultWrapper(t.Generic[T]):
         exception: Exception | None,
         code_on_error: int,
     ) -> None:
+        assert (isinstance(result, NotSet) and exception is not None) or (
+            not isinstance(result, NotSet) and exception is None
+        ), "set >NotSet< without exception or result with exception"
+
         self._result = result
         status: Status = STATUS_HANDLER.SUCCESS
         if exception is not None:
@@ -211,6 +215,11 @@ class ResultWrapper(t.Generic[T]):
     def __repr__(self) -> str:
         return self.__str__()
 
+    def unwrap(self) -> T:
+        STATUS_HANDLER.raise_for_status(self.status)
+
+        return self.result
+
 
 def wrap_result(
     code_on_error: int = DEFAULT_API_ERR_CODE,