add forms, shipments tests

backend/src/messages.py

@@ -1,21 +1,19 @@
 pdferror = 'An error occured during PDF generation please contact administrator'
 
-tokenexipired = 'Token expired'
-invalidtoken = 'Invalid token'
-notauthenticated = 'Not authenticated'
-failtogettoken = 'Failed to get token'
-unauthorized = 'Unauthorized'
-notallowed = 'Not Allowed'
+class Messages:
+    unauthorized = 'User is Unauthorized'
+    notauthenticated = 'User is not authenticated'
+    tokenexipired = 'Token has expired'
+    invalidtoken = 'Token is invalid'
+    
+    @staticmethod
+    def not_found(resource: str) -> str:
+        return f'{resource.capitalize()} not found'
+    
+    @staticmethod
+    def invalid_input(resource: str, reason: str = "") -> str:
+        return f'Invalid {resource} input {':' if reason else ""} {reason}'
 
-notfound = 'Resource was not found.'
-usernotfound = 'User not found'
-userloggedout = 'User logged out'
-
-productorinputinvalid = 'Invalid productor input'
-productornotfound = 'Productor not found'
-
-forminputinvalid = 'Invalid form input'
-formnotfound = 'Form not found'
-
-productinputinvalid = 'Invalid product input'
-productnotfound = 'Product not found'
+    @staticmethod
+    def not_allowed(resource: str, action: str) -> str:
+        return f'User is not allowed to {action} this {resource}'