add validation for username and fullname presence

.rspec

@@ -1 +1,2 @@
 --require spec_helper
+--format documentation

app/models/user.rb

@@ -1,4 +1,8 @@
 class User < ApplicationRecord
-    validates :username, presence: true, length: { minimum: 3, maximum: 10 }
-    validates :fullname, presence: true, length: { minimum: 3, maximum: 20 }
+    validates :username, presence: true, length: { minimum: 3, maximum: 10,
+                                                   too_long: 'Maximum allowed username is 10 characters.'
+                                                   too_short: 'Minimum allowed characters for username is 3' }
+    validates :fullname, presence: true, length: { minimum: 6, maximum: 20,
+                                                   too_long: 'Maximum allowed fullname is 20 characters.'
+                                                   too_short: 'Minimum allowed characters for fullname is 6'}
 end

spec/models/user_spec.rb

@@ -1,5 +1,9 @@
 require 'rails_helper'
 
 RSpec.describe User, type: :model do
-  pending "add some examples to (or delete) #{__FILE__}"
+  it { should validate_presence_of(:username) }
+  it { should validate_presence_of(:fullname) }
+
+
+
 end