Improve migration specs

This adds integration examples for migration service including coverage
for the improved logging.

spec/services/projects/hashed_storage/migration_service_spec.rb

@@ -5,6 +5,11 @@ require 'spec_helper'
 describe Projects::HashedStorage::MigrationService do
   let(:project) { create(:project, :empty_repo, :wiki_repo, :legacy_storage) }
   let(:logger) { double }
+  let!(:project_attachment) { build(:file_uploader, project: project) }
+  let(:project_hashed_path) { Storage::Hashed.new(project).disk_path }
+  let(:project_legacy_path) { Storage::LegacyProject.new(project).disk_path }
+  let(:wiki_hashed_path) { "#{project_hashed_path}.wiki" }
+  let(:wiki_legacy_path) { "#{project_legacy_path}.wiki" }
 
   subject(:service) { described_class.new(project, project.full_path, logger: logger) }
 
@@ -29,9 +34,24 @@ describe Projects::HashedStorage::MigrationService do
 
         service.execute
       end
+
+      it 'migrates legacy repositories to hashed storage' do
+        legacy_attachments_path = FileUploader.absolute_base_dir(project)
+        hashed_project = project.dup.tap { |p| p.id = project.id }
+        hashed_project.storage_version = ::Project::HASHED_STORAGE_FEATURES[:attachments]
+        hashed_attachments_path = FileUploader.absolute_base_dir(hashed_project)
+
+        expect(logger).to receive(:info).with(/Repository moved from '#{project_legacy_path}' to '#{project_hashed_path}'/)
+        expect(logger).to receive(:info).with(/Repository moved from '#{wiki_legacy_path}' to '#{wiki_hashed_path}'/)
+        expect(logger).to receive(:info).with(/Project attachments moved from '#{legacy_attachments_path}' to '#{hashed_attachments_path}'/)
+
+        expect { service.execute }.to change { project.storage_version }.from(nil).to(2)
+      end
     end
 
     context 'attachments migration' do
+      let(:project) { create(:project, :empty_repo, :wiki_repo, storage_version: ::Project::HASHED_STORAGE_FEATURES[:repository]) }
+
       let(:attachments_service) do
         Projects::HashedStorage::MigrateAttachmentsService.new(project: project,
                                                                old_disk_path: project.full_path,
@@ -51,6 +71,17 @@ describe Projects::HashedStorage::MigrationService do
 
         service.execute
       end
+
+      it 'migrates legacy attachments to hashed storage' do
+        legacy_attachments_path = FileUploader.absolute_base_dir(project)
+        hashed_project = project.dup.tap { |p| p.id = project.id }
+        hashed_project.storage_version = ::Project::HASHED_STORAGE_FEATURES[:attachments]
+        hashed_attachments_path = FileUploader.absolute_base_dir(hashed_project)
+
+        expect(logger).to receive(:info).with(/Project attachments moved from '#{legacy_attachments_path}' to '#{hashed_attachments_path}'/)
+
+        expect { service.execute }.to change { project.storage_version }.from(1).to(2)
+      end
     end
   end
 end