Extract the validation of Username format in own class to avoid

complexity in user model object

spec/models/user_spec.rb

@@ -193,7 +193,6 @@ describe User do
     end
   end
 
-
   describe 'new' do
 
     subject { Fabricate.build(:user) }
@@ -394,20 +393,6 @@ describe User do
     end
   end
 
-  context '.username_valid?' do
-    it 'returns true when username is both valid and available' do
-      User.username_valid?('Available').should be_true
-    end
-
-    it 'returns true when the username is valid but not available' do
-      User.username_valid?(Fabricate(:user).username).should be_true
-    end
-
-    it 'returns false when the username is not valid' do
-      User.username_valid?('not valid.name').should be_false
-    end
-  end
-
   describe '.suggest_username' do
     it 'corrects weird characters' do
       User.suggest_username("Darth%^Vadar").should == "Darth_Vadar"

spec/models/username_validator_spec.rb

@@ -0,0 +1,17 @@
+require 'spec_helper'
+
+describe UsernameValidator do
+  context "#valid_format?" do
+    it 'returns true when username is both valid and available' do
+      expect(UsernameValidator.new('Available').valid_format?).to eq true
+    end
+
+    it 'returns true when the username is valid but not available' do
+      expect(UsernameValidator.new(Fabricate(:user).username).valid_format?).to eq true
+    end
+
+    it 'returns false when the username is not valid' do
+      expect(UsernameValidator.new('not valid.name').valid_format?).to eq false
+    end
+  end
+end