Add tests for the gitlab:db:configure rake task

spec/tasks/gitlab/db_rake_spec.rb

+require 'spec_helper'
+require 'rake'
+
+describe 'gitlab:db namespace rake task' do
+  before :all do
+    Rake.application.rake_require 'active_record/railties/databases'
+    Rake.application.rake_require 'tasks/seed_fu'
+    Rake.application.rake_require 'tasks/gitlab/db'
+
+    # empty task as env is already loaded
+    Rake::Task.define_task :environment
+  end
+
+  before do
+    # Stub out db tasks
+    allow(Rake::Task['db:migrate']).to receive(:invoke).and_return(true)
+    allow(Rake::Task['db:schema:load']).to receive(:invoke).and_return(true)
+    allow(Rake::Task['db:seed_fu']).to receive(:invoke).and_return(true)
+  end
+
+  describe 'configure' do
+    it 'should invoke db:migrate when schema has already been loaded' do
+      allow(ActiveRecord::Base.connection).to receive(:table_exists?).and_return(true)
+      expect(Rake::Task['db:migrate']).to receive(:invoke)
+      expect(Rake::Task['db:schema:load']).not_to receive(:invoke)
+      expect(Rake::Task['db:seed_fu']).not_to receive(:invoke)
+      expect { run_rake_task('gitlab:db:configure') }.not_to raise_error
+    end
+
+    it 'should invoke db:shema:load and db:seed_fu when schema is not loaded' do
+      allow(ActiveRecord::Base.connection).to receive(:table_exists?).and_return(false)
+      expect(Rake::Task['db:schema:load']).to receive(:invoke)
+      expect(Rake::Task['db:seed_fu']).to receive(:invoke)
+      expect(Rake::Task['db:migrate']).not_to receive(:invoke)
+      expect { run_rake_task('gitlab:db:configure') }.not_to raise_error
+    end
+
+    it 'should not invoke any other rake tasks during an error' do
+      allow(ActiveRecord::Base).to receive(:connection).and_raise(RuntimeError, 'error')
+      expect(Rake::Task['db:migrate']).not_to receive(:invoke)
+      expect(Rake::Task['db:schema:load']).not_to receive(:invoke)
+      expect(Rake::Task['db:seed_fu']).not_to receive(:invoke)
+      expect { run_rake_task('gitlab:db:configure') }.to raise_error(RuntimeError, 'error')
+      # unstub connection so that the database cleaner still works
+      allow(ActiveRecord::Base).to receive(:connection).and_call_original
+    end
+
+    it 'should not invoke seed after a failed schema_load' do
+      allow(ActiveRecord::Base.connection).to receive(:table_exists?).and_return(false)
+      allow(Rake::Task['db:schema:load']).to receive(:invoke).and_raise(RuntimeError, 'error')
+      expect(Rake::Task['db:schema:load']).to receive(:invoke)
+      expect(Rake::Task['db:seed_fu']).not_to receive(:invoke)
+      expect(Rake::Task['db:migrate']).not_to receive(:invoke)
+      expect { run_rake_task('gitlab:db:configure') }.to raise_error(RuntimeError, 'error')
+    end
+  end
+
+  def run_rake_task(task_name)
+    Rake::Task[task_name].reenable
+    Rake.application.invoke_task task_name
+  end
+end