Wrote specs for HasPublicAuthor module

spec/models/concerns/has_public_author_spec.rb

@@ -0,0 +1,21 @@
+require 'spec_helper'
+
+shared_examples_for 'has_public_author' do
+  let(:model) { described_class }
+
+  describe 'public_author' do
+    it "returns author if author's activity is public" do
+      author = create(:user, public_activity: true)
+      authored_element = create(model.to_s.underscore.to_sym, author: author)
+
+      expect(authored_element.public_author).to eq(author)
+    end
+
+    it "returns nil if author's activity is private" do
+      author = create(:user, public_activity: false)
+      authored_element = create(model.to_s.underscore.to_sym, author: author)
+
+      expect(authored_element.public_author).to be_nil
+    end
+  end
+end