Fix blame view line groupings

Closes #2305

spec/controllers/blame_controller_spec.rb

@@ -0,0 +1,43 @@
+require 'spec_helper'
+
+describe Projects::BlameController do
+  let(:project) { create(:project) }
+  let(:user)    { create(:user) }
+
+  before do
+    sign_in(user)
+
+    project.team << [user, :master]
+    controller.instance_variable_set(:@project, project)
+  end
+
+  describe "GET show" do
+    render_views
+
+    before do
+      get(:show,
+          namespace_id: project.namespace.to_param,
+          project_id: project.to_param,
+          id: id)
+    end
+
+    context "valid file" do
+      let(:id) { 'master/files/ruby/popen.rb' }
+      it { is_expected.to respond_with(:success) }
+
+      it 'groups blames properly' do
+        blame = assigns(:blame)
+        # Sanity check a few items
+        expect(blame.count).to eq(18)
+        expect(blame[0][:commit].sha).to eq('913c66a37b4a45b9769037c55c2d238bd0942d2e')
+        expect(blame[0][:lines]).to eq(["require 'fileutils'", "require 'open3'", ""])
+
+        expect(blame[1][:commit].sha).to eq('874797c3a73b60d2187ed6e2fcabd289ff75171e')
+        expect(blame[1][:lines]).to eq(["module Popen", "  extend self"])
+
+        expect(blame[-1][:commit].sha).to eq('913c66a37b4a45b9769037c55c2d238bd0942d2e')
+        expect(blame[-1][:lines]).to eq(["  end", "end"])
+      end
+    end
+  end
+end