updated file with some added text for understanding.

Author: mayankbaranwal

tests/schema_test.py

@@ -1,11 +1,16 @@
 import json
-
 import requests
 from assertpy import assert_that, soft_assertions
 from cerberus import Validator
-
 from config import BASE_URI
 
+''' 
+Chapter 6 - API Response Schema Validation
+https://docs.python-cerberus.org/en/stable/
+So, the main CRUDs of the Cerberus is actually the Schema and it's a disctionary like structure as we can see below,
+that they define. Cerberus defines its own sort of mini language to define the schemas as well as their types.
+
+'''
 schema = {
     "fname": {'type': 'string'},
     "lname": {'type': 'string'},
@@ -17,7 +22,12 @@
 def test_read_one_operation_has_expected_schema():
     response = requests.get(f'{BASE_URI}/1')
     person = json.loads(response.text)
-
+    '''
+    Below is the main logic, how Cerberus works. We create an object of the Validator class and passing the 'schema'
+    dictionary that we've already created. Notice, the second argument 'require_all=True' , this is a global flag that 
+    we can set for this particular 'schema' specifying that all the keys in this response are required. So, if for 
+    some reason our API tomorrow skips any field we will get an error. 
+    '''
     validator = Validator(schema, require_all=True)
     is_valid = validator.validate(person)