add validations for boolean attributes

app/models/project.rb

@@ -104,6 +104,8 @@ class Project < ActiveRecord::Base
             length: { within: 1..255 }
 
   validates :owner, presence: true
+  validates :issues_enabled, :wall_enabled, :merge_requests_enabled,
+            :wiki_enabled, inclusion: { in: [true, false] }
   validate :check_limit
   validate :repo_name
 

app/roles/issue_commonality.rb

@@ -16,7 +16,7 @@ module IssueCommonality
     validates :title,
               presence: true,
               length: { within: 0..255 }
-
+    validates :closed, inclusion: { in: [true, false] }
 
     scope :opened, where(closed: false)
     scope :closed, where(closed: true)

spec/models/issue_spec.rb

@@ -7,6 +7,7 @@ describe Issue do
 
   describe "Validation" do
     it { should ensure_length_of(:description).is_within(0..2000) }
+    it { should ensure_inclusion_of(:closed).in_array([true, false]) }
   end
 
   describe 'modules' do

spec/models/milestone_spec.rb

@@ -9,6 +9,7 @@ describe Milestone do
   describe "Validation" do
     it { should validate_presence_of(:title) }
     it { should validate_presence_of(:project_id) }
+    it { should ensure_inclusion_of(:closed).in_array([true, false]) }
   end
 
   let(:milestone) { Factory :milestone }

spec/models/project_spec.rb

@@ -37,6 +37,10 @@ describe Project do
     # TODO: Formats
 
     it { should validate_presence_of(:owner) }
+    it { should ensure_inclusion_of(:issues_enabled).in_array([true, false]) }
+    it { should ensure_inclusion_of(:wall_enabled).in_array([true, false]) }
+    it { should ensure_inclusion_of(:merge_requests_enabled).in_array([true, false]) }
+    it { should ensure_inclusion_of(:wiki_enabled).in_array([true, false]) }
 
     it "should not allow new projects beyond user limits" do
       project.stub(:owner).and_return(double(can_create_project?: false, projects_limit: 1))