Don't allow creation of HttpStatusError with invalid values.

Because I was creating dummy errors somewhere else with an
error code of 123 and took me 30min to figure out why the repr of the
errors were empty.

Author: Carreau

src/py/pyodide/http.py

@@ -40,6 +40,9 @@ def __init__(self, status: int, status_text: str, url: str) -> None:
             super().__init__(f"{status} Client Error: {status_text} for url: {url}")
         elif 500 <= status < 600:
             super().__init__(f"{status} Server Error: {status_text} for url: {url}")
+        raise ValueError(
+            f"Invalid error code not comprised between 400 and 599: {status}"
+        )
 
 
 class BodyUsedError(OSError):

src/tests/test_pyodide_http.py

@@ -113,6 +113,18 @@ async def test_pyfetch_raise_for_status_does_not_raise_200(
     assert error_504.value.url.endswith("status_504")
 
 
+@run_in_pyodide
+async def cant_create_invalid_HttpStatusErrors(selenium):
+    from pyodide.http import HttpStatusError,
+
+    with pytest.raises(ValueError, match="Invalid error code not comprised between 400 and 599"):
+         HttpStatusError(200, "Can't raise a success error code")
+
+    with pytest.raises(ValueError, match="Invalid error code not comprised between 400 and 599"):
+         HttpStatusError(999, "Can't raise an unknown error code")
+
+
+
 @run_in_pyodide
 async def test_pyfetch_unpack_archive(selenium):
     import pathlib