Add 4xx and 5xx http-code exception wrappers

tests/test_router.py

@@ -1,6 +1,7 @@
 import pytest
 
 from src.turbosloth.router import Router
+from src.turbosloth.exceptions import NotFoundException, MethodNotAllowedException
 
 
 def test_router_root_handler():
@@ -46,7 +47,10 @@ def test_router_match():
     r = Router()
     r.add('GET', 'asdf', f)
     assert r.match('GET', '/asdf')
-    with pytest.raises(ValueError, match='404'):
+    with pytest.raises(NotFoundException, match='404\tNot Found: asd'):
         r.match('GET', 'asd')
-    with pytest.raises(ValueError, match='405'):
+    with pytest.raises(MethodNotAllowedException, match=f'405\tMethod Not Allowed: POST /asdf, allowed: GET'):
         r.match('POST', 'asdf')
+
+    with pytest.raises(MethodNotAllowedException, match=f'405\tMethod Not Allowed: POST /, allowed: none'):
+        r.match('POST', '')