add archive model

spec/models/archive_spec.rb

@@ -0,0 +1,51 @@
+describe Dossier do
+  include ActiveJob::TestHelper
+
+  before { Timecop.freeze(Time.zone.now) }
+  after { Timecop.return }
+
+  let(:archive) { create(:archive) }
+
+  describe 'scopes' do
+    describe 'staled' do
+      let(:recent_archive) { create(:archive) }
+      let(:staled_archive) { create(:archive, updated_at: (Archive::RETENTION_DURATION + 2).days.ago) }
+
+      subject do
+        archive; recent_archive; staled_archive
+        Archive.stale
+      end
+
+      it { is_expected.to match_array([staled_archive]) }
+    end
+  end
+
+  describe '.status' do
+    it { expect(archive.status).to eq('pending') }
+  end
+
+  describe '#make_available!' do
+    before { archive.make_available! }
+    it { expect(archive.status).to eq('generated') }
+  end
+
+  describe '#available?' do
+    subject { archive.available? }
+    context 'without attachment' do
+      let(:archive) { create(:archive, file: nil) }
+      it { is_expected.to eq(false) }
+    end
+
+    context 'with an attachment' do
+      context 'when the attachment was created but the process was not over' do
+        let(:archive) { create(:archive, :pending, file: Rack::Test::UploadedFile.new('spec/fixtures/files/file.pdf', 'application/pdf')) }
+        it { is_expected.to eq(false) }
+      end
+
+      context 'when the attachment was created but the process was not over' do
+        let(:archive) { create(:archive, :generated, file: Rack::Test::UploadedFile.new('spec/fixtures/files/file.pdf', 'application/pdf')) }
+        it { is_expected.to eq(true) }
+      end
+    end
+  end
+end