diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
index 93b7ab7c0..2fdd20f71 100644
--- a/.rubocop_todo.yml
+++ b/.rubocop_todo.yml
@@ -32,13 +32,6 @@ Lint/AssignmentInCondition:
   Exclude:
     - 'app/models/member.rb'
 
-# Offense count: 2
-# Cop supports --auto-correct.
-Lint/DeprecatedClassMethods:
-  Exclude:
-    - 'app/controllers/robots_controller.rb'
-    - 'config/boot.rb'
-
 # Offense count: 1
 Lint/HandleExceptions:
   Exclude:
diff --git a/.travis.yml b/.travis.yml
index 3aefec912..5f2219acd 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -25,6 +25,7 @@ before_install:
   - phantomjs --version
 before_script:
   - bundle exec rake db:create db:migrate db:test:prepare
+  - bundle exec rake assets:precompile
 script:
   - bundle exec rubocop --display-cop-names --rails
   - script/gemfile_check
diff --git a/app/controllers/robots_controller.rb b/app/controllers/robots_controller.rb
index d74ffe20f..eb846d23d 100644
--- a/app/controllers/robots_controller.rb
+++ b/app/controllers/robots_controller.rb
@@ -3,7 +3,7 @@ class RobotsController < ApplicationController
 
   def robots
     filename = "config/robots.#{subdomain}.txt" if subdomain && subdomain != 'www'
-    file_to_render = File.exists?(filename.to_s) ? filename : DEFAULT_FILENAME
+    file_to_render = File.exist?(filename.to_s) ? filename : DEFAULT_FILENAME
     render file: file_to_render, layout: false, content_type: 'text/plain'
   end
 
diff --git a/app/helpers/plantings_helper.rb b/app/helpers/plantings_helper.rb
index e237ae27d..f4d8d45be 100644
--- a/app/helpers/plantings_helper.rb
+++ b/app/helpers/plantings_helper.rb
@@ -1,13 +1,13 @@
 module PlantingsHelper
   def display_days_before_maturity(planting)
     if planting.finished?
-      0
+      "0"
     elsif !planting.finished_at.nil?
-      ((p = planting.finished_at - DateTime.now).to_i) <= 0 ? 0 : p.to_i
-    elsif planting.days_before_maturity.nil?
+      ((p = planting.finished_at - Date.current).to_i) <= 0 ? "0" : p.to_i.to_s
+    elsif planting.planted_at.nil? || planting.days_before_maturity.nil?
       "unknown"
     else
-      ((p = (planting.planted_at + planting.days_before_maturity) - DateTime.now).to_i <= 0) ? 0 : p.to_i
+      ((p = (planting.planted_at + planting.days_before_maturity) - Date.current).to_i <= 0) ? "0" : p.to_i.to_s
     end
   end
 
diff --git a/config/boot.rb b/config/boot.rb
index 4489e5868..f2830ae31 100644
--- a/config/boot.rb
+++ b/config/boot.rb
@@ -3,4 +3,4 @@ require 'rubygems'
 # Set up gems listed in the Gemfile.
 ENV['BUNDLE_GEMFILE'] ||= File.expand_path('../../Gemfile', __FILE__)
 
-require 'bundler/setup' if File.exists?(ENV['BUNDLE_GEMFILE'])
+require 'bundler/setup' if File.exist?(ENV['BUNDLE_GEMFILE'])
diff --git a/config/environments/test.rb b/config/environments/test.rb
index 35836c90b..dd3a3816c 100644
--- a/config/environments/test.rb
+++ b/config/environments/test.rb
@@ -6,6 +6,10 @@ Growstuff::Application.configure do
   # preloads Rails for running tests, you may have to set it to true.
   config.eager_load = false
 
+  # Do not compile assets on-demand. On-demand compilation slows down the test
+  # suite and causes random test failures.
+  config.assets.compile = false
+
   # The test environment is used exclusively to run your application's
   # test suite. You never need to work with it otherwise. Remember that
   # your test database is "scratch space" for the test suite and is wiped
diff --git a/lib/tasks/testing.rake b/lib/tasks/testing.rake
index a7908d590..b41172efb 100644
--- a/lib/tasks/testing.rake
+++ b/lib/tasks/testing.rake
@@ -2,7 +2,7 @@ require 'rake'
 begin
   require 'rspec/core/rake_task'
   task(:spec).clear
-  RSpec::Core::RakeTask.new(spec: 'db:test:prepare') do |t|
+  RSpec::Core::RakeTask.new(spec: ['db:create', 'db:test:prepare']) do |t|
     t.verbose = false
   end
 rescue LoadError
diff --git a/spec/helpers/plantings_helper_spec.rb b/spec/helpers/plantings_helper_spec.rb
index 9485af81d..e776501b4 100644
--- a/spec/helpers/plantings_helper_spec.rb
+++ b/spec/helpers/plantings_helper_spec.rb
@@ -1,6 +1,69 @@
 require 'rails_helper'
 
 describe PlantingsHelper do
+  describe "display_days_before_maturity" do
+    it "handles nil planted_at, nil finished_at, non-nil days_until_maturity" do
+      planting = FactoryGirl.build(:planting,
+        quantity: 5,
+        planted_at: nil,
+        finished_at: nil,
+        days_before_maturity: 17
+      )
+      result = helper.display_days_before_maturity(planting)
+      expect(result).to eq "unknown"
+    end
+
+    it "handles non-nil planted_at and d_b_m, nil finished_at" do
+      planting = FactoryGirl.build(:planting,
+        quantity: 5,
+        planted_at: Date.current,
+        finished_at: nil,
+        days_before_maturity: 17
+      )
+      result = helper.display_days_before_maturity(planting)
+      expect(result).to eq "17"
+    end
+
+    it "handles completed plantings" do
+      planting = FactoryGirl.build(:planting, finished: true)
+      result = helper.display_days_before_maturity(planting)
+      expect(result).to eq "0"
+    end
+
+    it "handles plantings that should have finished" do
+      planting = FactoryGirl.build(:planting,
+        quantity: 5,
+        planted_at: Date.new(0, 1, 1),
+        finished_at: nil,
+        days_before_maturity: "17"
+      )
+      result = helper.display_days_before_maturity(planting)
+      expect(result).to eq "0"
+    end
+
+    it "handles nil d_b_m and nil finished_at" do
+      planting = FactoryGirl.build(:planting,
+        quantity: 5,
+        planted_at: Date.new(2012, 5, 12),
+        finished_at: nil,
+        days_before_maturity: nil
+      )
+      result = helper.display_days_before_maturity(planting)
+      expect(result).to eq "unknown"
+    end
+
+    it "handles finished_at dates in the future" do
+      planting = FactoryGirl.build(:planting,
+        quantity: 5,
+        planted_at: Date.current,
+        finished_at: Date.current + 5,
+        days_before_maturity: nil
+      )
+      result = helper.display_days_before_maturity(planting)
+      expect(result).to eq "5"
+    end
+  end
+
   describe "display_planting" do
     let!(:member) { FactoryGirl.build(:member, login_name: 'crop_lady') }