✨ Implement Handler and HandlerFunc, add comprehensive tests

helper.go

@@ -11,20 +11,26 @@ func NewHelper(errH ErrorHandler) *Helper {
 type ErrorHandler func(http.ResponseWriter, *http.Request, error)
 
 // Helper provides methods to make easier, more idiomatic [http.Handler]s.
-type Helper struct{
+type Helper struct {
 	errHandler ErrorHandler
 }
 
 // Handler returns an [http.Handler] for the provided [Handler].
 // If hnd returns an error, an appropriate error response is written using the ErrorHandler.
 func (help *Helper) Handler(hnd Handler) http.Handler {
-	// TODO implement this
-	panic("unimplemented")
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if err := hnd.ServeHTTP(w, r); err != nil {
+			help.errHandler(w, r, err)
+		}
+	})
 }
 
 // Handler returns an [http.Handler] for the provided [HandlerFunc].
 // If hnd returns an error, an appropriate error response is written using the ErrorHandler.
 func (help *Helper) HandlerFunc(hnd HandlerFunc) http.Handler {
-	// TODO implement this
-	panic("unimplemented")
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		if err := hnd(w, r); err != nil {
+			help.errHandler(w, r, err)
+		}
+	})
 }