Disable observers in specs. Enable only when observer is under test.

Used the built-in observer enable/disable feature in ActiveModel[1].
ActiveRecord::Base includes ActiveModel::Observing which provides this
behavior.

Simple wraps to enable the observer under test were added to the specs
for: ActivityObserver, IssueObserver, Admin::Users and Issues.

The spec for Project.last_activity was refactored to separate the tests
for #last_activity and #last_activity_date. Each had doubles added to
isolate the spec from the hidden dependency on the ActivityObserver
action to create an Event for the project when an Issue is created. This
ActivityObserver behavior is already tested by its spec.

[1] http://api.rubyonrails.org/classes/ActiveModel/ObserverArray.html

spec/models/activity_observer_spec.rb

@@ -10,8 +10,10 @@ describe ActivityObserver do
 
   describe "Merge Request created" do 
     before do
-      @merge_request = Factory :merge_request, :project => project
-      @event = Event.last
+      MergeRequest.observers.enable :activity_observer do
+        @merge_request = Factory :merge_request, :project => project
+        @event = Event.last
+      end
     end
 
     it_should_be_valid_event
@@ -21,8 +23,10 @@ describe ActivityObserver do
 
   describe "Issue created" do 
     before do
-      @issue = Factory :issue, :project => project
-      @event = Event.last
+      Issue.observers.enable :activity_observer do
+        @issue = Factory :issue, :project => project
+        @event = Event.last
+      end
     end
 
     it_should_be_valid_event

spec/models/issue_observer_spec.rb

@@ -13,7 +13,10 @@ describe IssueObserver do
 
     it 'is called when an issue is created' do
       subject.should_receive(:after_create)
-      Factory.create(:issue, :project => Factory.create(:project))
+
+      Issue.observers.enable :issue_observer do
+        Factory.create(:issue, :project => Factory.create(:project))
+      end
     end
 
     it 'sends an email to the assignee' do
@@ -40,8 +43,11 @@ describe IssueObserver do
     it 'is called when an issue is changed' do
       changed = Factory.create(:issue, :project => Factory.create(:project))
       subject.should_receive(:after_update)
-      changed.description = 'I changed'
-      changed.save
+
+      Issue.observers.enable :issue_observer do
+        changed.description = 'I changed'
+        changed.save
+      end
     end
 
     context 'a reassigned email' do

spec/models/project_spec.rb

@@ -72,16 +72,29 @@ describe Project do
   end
 
   describe "last_activity" do
-    let(:project) { Factory :project }
+    let(:project)    { Factory :project }
+    let(:last_event) { double }
 
     before do
-      @issue = Factory :issue, :project => project
+      project.stub(:events).and_return( [ double, double, last_event ] )
     end
 
-    it { project.last_activity.should == Event.last }
-    it { project.last_activity_date.to_s.should == Event.last.created_at.to_s }
+    it { project.last_activity.should == last_event }
   end
 
+  describe 'last_activity_date' do
+    let(:project)    { Factory :project }
+
+    it 'returns the creation date of the project\'s last event if present' do
+      last_event = double(:created_at => 'now')
+      project.stub(:events).and_return( [double, double, last_event] )
+      project.last_activity_date.should == last_event.created_at
+    end
+
+    it 'returns the project\'s last update date if it has no events' do
+      project.last_activity_date.should == project.updated_at
+    end
+  end
   describe "fresh commits" do
     let(:project) { Factory :project }
 

spec/requests/admin/admin_users_spec.rb

@@ -40,19 +40,23 @@ describe "Admin::Users" do
     end
 
     it "should call send mail" do
-      Notify.should_receive(:new_user_email).and_return(stub(:deliver => true))
-      click_button "Save"
+      User.observers.enable :mailer_observer do
+        Notify.should_receive(:new_user_email).and_return(stub(:deliver => true))
+        click_button "Save"
+      end
     end
 
     it "should send valid email to user with email & password" do
-      with_resque do
-        click_button "Save"
+      User.observers.enable :mailer_observer do
+        with_resque do
+          click_button "Save"
+        end
+        user = User.last
+        email = ActionMailer::Base.deliveries.last
+        email.subject.should have_content("Account was created")
+        email.body.should have_content(user.email)
+        email.body.should have_content(@password)
       end
-      user = User.last
-      email = ActionMailer::Base.deliveries.last
-      email.subject.should have_content("Account was created")
-      email.body.should have_content(user.email)
-      email.body.should have_content(@password)
     end
   end
 

spec/requests/issues_spec.rb

@@ -128,18 +128,22 @@ describe "Issues" do
         end
 
         it "should call send mail" do
-          Notify.should_receive(:new_issue_email).and_return(stub(:deliver => true))
-          click_button "Submit new issue"
+          Issue.observers.enable :issue_observer do
+            Notify.should_receive(:new_issue_email).and_return(stub(:deliver => true))
+            click_button "Submit new issue"
+          end
         end
 
         it "should send valid email to user" do
-          with_resque do
-            click_button "Submit new issue"
+          Issue.observers.enable :issue_observer do
+            with_resque do
+              click_button "Submit new issue"
+            end
+            issue = Issue.last
+            email = ActionMailer::Base.deliveries.last
+            email.subject.should have_content("New Issue was created")
+            email.body.should have_content(issue.title)
           end
-          issue = Issue.last
-          email = ActionMailer::Base.deliveries.last
-          email.subject.should have_content("New Issue was created")
-          email.body.should have_content(issue.title)
         end
 
       end

spec/spec_helper.rb

@@ -52,6 +52,7 @@ RSpec.configure do |config|
     DatabaseCleaner.start
 
     WebMock.disable_net_connect!(allow_localhost: true)
+    ActiveRecord::Base.observers.disable :all
   end
 
   config.after do