Try to fix specs that are failing in jenkins

app/models/user.rb

@@ -283,7 +283,7 @@ class User < ActiveRecord::Base
   end
 
   def update_last_seen!
-    now = DateTime.now
+    now = Time.zone.now
     now_date = now.to_date
     # Only update last seen once every minute
     redis_key = "user:#{self.id}:#{now_date.to_s}"

spec/models/user_spec.rb

@@ -584,6 +584,7 @@ describe User do
   end
 
   describe "previous_visit_at" do
+
     let(:user) { Fabricate(:user) }
 
     before do
@@ -595,13 +596,17 @@ describe User do
     end
 
     describe "first time" do
-      let!(:first_visit_date) { DateTime.now }
+      let!(:first_visit_date) { Time.zone.now }
 
       before do
-        DateTime.stubs(:now).returns(first_visit_date)
+        Timecop.freeze(first_visit_date)
         user.update_last_seen!
       end
 
+      after do
+        Timecop.return
+      end
+
       it "should have no value" do
         user.previous_visit_at.should be_nil
       end
@@ -609,10 +614,14 @@ describe User do
       describe "another call right after" do
         before do
           # A different time, to make sure it doesn't change
-          DateTime.stubs(:now).returns(10.minutes.from_now)
+          Timecop.freeze(10.minutes.from_now)
           user.update_last_seen!
         end
 
+        after do
+          Timecop.return
+        end
+
         it "still has no value" do
           user.previous_visit_at.should be_nil
         end
@@ -622,24 +631,33 @@ describe User do
         let!(:second_visit_date) { 2.hours.from_now }
 
         before do
-          DateTime.stubs(:now).returns(second_visit_date)
+          Timecop.freeze(second_visit_date)
           user.update_last_seen!
         end
 
+        after do
+          Timecop.return
+        end
+
         it "should have the previous visit value" do
-          user.previous_visit_at.should == first_visit_date
+          user.reload
+          user.previous_visit_at.should be_within_one_second_of(first_visit_date)
         end
 
         describe "third visit" do
           let!(:third_visit_date) { 5.hours.from_now }
 
           before do
-            DateTime.stubs(:now).returns(third_visit_date)
+            Timecop.freeze(third_visit_date)
             user.update_last_seen!
           end
 
+          after do
+            Timecop.return
+          end
+
           it "should have the second visit value" do
-            user.previous_visit_at.should == second_visit_date
+            user.previous_visit_at.should be_within_one_second_of(second_visit_date)
           end
 
         end
@@ -662,15 +680,19 @@ describe User do
     end
 
     describe 'with no previous values' do
-      let!(:date) { DateTime.now }
+      let!(:date) { Time.zone.now }
 
       before do
-        DateTime.stubs(:now).returns(date)
+        Timecop.freeze(date)
         user.update_last_seen!
       end
 
+      after do
+        Timecop.return
+      end
+
       it "updates last_seen_at" do
-        user.last_seen_at.should == date
+        user.last_seen_at.should be_within_one_second_of(date)
       end
 
       it "should have 0 for days_visited" do
@@ -685,12 +707,16 @@ describe User do
       context "called twice" do
 
         before do
-          DateTime.stubs(:now).returns(date)
+          Timecop.freeze(date)
           user.update_last_seen!
           user.update_last_seen!
           user.reload
         end
 
+        after do
+          Timecop.return
+        end
+
         it "doesn't increase days_visited twice" do
           user.days_visited.should == 1
         end
@@ -701,10 +727,14 @@ describe User do
         let!(:future_date) { 3.days.from_now }
 
         before do
-          DateTime.stubs(:now).returns(future_date)
+          Timecop.freeze(future_date)
           user.update_last_seen!
         end
 
+        after do
+          Timecop.return
+        end
+
         it "should log a second visited_at record when we log an update later" do
           user.user_visits.count.should == 2
         end

spec/support/time_matcher.rb

@@ -0,0 +1,8 @@
+RSpec::Matchers.define :be_within_one_second_of do |expected_time|
+  match do |actual_time|
+    (actual_time - expected_time).abs < 1
+  end
+  failure_message_for_should do |actual_time|
+    "#{actual_time.to_s} is not within 1 second of #{expected_time}"
+  end
+end