Add releases API

This commit introduces Releases API under /api/v4/projects/:id/releases

* We are introducing release policies at project level.
* We are deprecating releases changes from tags, both api and web
interface.
* Tags::CreateService no longer create a release

This feature is controlled by :releases_page feature flag

1 files changed, 43 insertions, 0 deletions

diff --git a/spec/finders/releases_finder_spec.rb b/spec/finders/releases_finder_spec.rb
new file mode 100644
index 00000000000..aa7163021cb
--- /dev/null
+++ b/spec/finders/releases_finder_spec.rb
@@ -0,0 +1,43 @@
+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe ReleasesFinder do
+  let(:user)       { create(:user) }
+  let(:project)    { create(:project, :repository) }
+  let(:repository) { project.repository }
+  let(:v1_0_0)     { create(:release, project: project, tag: 'v1.0.0')}
+  let(:v1_1_0)     { create(:release, project: project, tag: 'v1.1.0')}
+
+  subject { described_class.new(project, user)}
+
+  before do
+    now = Time.now
+    v1_0_0.update_attribute(:created_at, now - 2.days)
+    v1_1_0.update_attribute(:created_at, now - 1.day)
+  end
+
+  describe '#execute' do
+    context 'when the user is not part of the project' do
+      it 'returns no releases' do
+        releases = subject.execute
+
+        expect(releases).to be_empty
+      end
+    end
+
+    context 'when the user is a project developer' do
+      before do
+        project.add_developer(user)
+      end
+
+      it 'sorts by creation date' do
+        releases = subject.execute
+
+        expect(releases).to be_present
+        expect(releases.size).to eq(2)
+        expect(releases).to eq([v1_1_0, v1_0_0])
+      end
+    end
+  end
+end