Refactor the Development documentation, and divide the Testing documentation into multiple pages

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diff --git a/doc/development/testing_guide/testing_rake_tasks.md b/doc/development/testing_guide/testing_rake_tasks.md
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+## Testing Rake tasks
+
+To make testing Rake tasks a little easier, there is a helper that can be included
+in lieu of the standard Spec helper. Instead of `require 'spec_helper'`, use
+`require 'rake_helper'`. The helper includes `spec_helper` for you, and configures
+a few other things to make testing Rake tasks easier.
+
+At a minimum, requiring the Rake helper will redirect `stdout`, include the
+runtime task helpers, and include the `RakeHelpers` Spec support module.
+
+The `RakeHelpers` module exposes a `run_rake_task(<task>)` method to make
+executing tasks simple. See `spec/support/rake_helpers.rb` for all available
+methods.
+
+Example:
+
+```ruby
+require 'rake_helper'
+
+describe 'gitlab:shell rake tasks' do
+  before do
+    Rake.application.rake_require 'tasks/gitlab/shell'
+
+    stub_warn_user_is_not_gitlab
+  end
+
+ describe 'install task' do
+    it 'invokes create_hooks task' do
+      expect(Rake::Task['gitlab:shell:create_hooks']).to receive(:invoke)
+
+      run_rake_task('gitlab:shell:install')
+    end
+  end
+end
+```
+
+---
+
+[Return to Testing documentation](index.md)