Fix test configuration to allow rake test coverage

The test coverage was getting reset for the rake tests because rake was
being restarted constantly.  This moves the start into the spec_helper,
so it's only started once, based on reading:

simplecov-ruby/simplecov#369

Also required moving the last_comment fix into the spec_helper since
that's how production rake runs

spec/lib/tasks/incidents_periodic_spec.rb

@@ -1,26 +1,9 @@
 require 'spec_helper'
 
-describe "incidents_periodic:send_reminders" do
-  include_context "rake"
-
-  describe '#prerequisites' do
-    subject { super().prerequisites }
-    it { is_expected.to eq(['send_missing_incident_report'])}
-  end
-end
-
 describe "" do
   include_context "rake"
   let(:task_name) { self.class.description }
 
-  before(:each) do
-
-  end
-
-  after(:each) do
-    Delorean.back_to_1985
-  end
-
   describe "incidents_periodic:send_no_incident_report" do
 
     before(:each) do

spec/spec_helper.rb

@@ -49,6 +49,17 @@
 # If you are not using ActiveRecord, you can remove this line.
 ActiveRecord::Migration.maintain_test_schema!
 
+# Load rake tasks so they can be tested.
+module TempFixForRakeLastComment
+  def last_comment
+    last_description
+  end
+end
+Rake::Application.send :include, TempFixForRakeLastComment
+
+Rake.application = Rake::Application.new
+Rails.application.load_tasks
+
 RSpec.configure do |config|
   # ## Mock Framework
   #

spec/support/shared_contexts/rake.rb

@@ -1,19 +1,15 @@
 require "rake"
 
 shared_context "rake" do
-  let(:rake)      { Rake::Application.new }
   let(:task_name) { self.class.top_level_description }
   let(:task_path) { "lib/tasks/#{task_name.split(":").first}" }
-  subject         { rake[task_name] }
+  subject         { Rake.application[task_name] }
 
   def loaded_files_excluding_current_rake_file
     $".reject {|file| file == Rails.root.join("#{task_path}.rake").to_s }
   end
 
   before do
-    Rake.application = rake
-    Rake.application.rake_require(task_path, [Rails.root.to_s], loaded_files_excluding_current_rake_file)
-
-    Rake::Task.define_task(:environment)
+    subject.reenable
   end
 end