Add branch controller test.

spec/controllers/branches_controller_spec.rb

+require 'spec_helper'
+
+describe Projects::BranchesController do
+  let(:project) { create(:project) }
+  let(:user)    { create(:user) }
+
+  before do
+    sign_in(user)
+
+    project.team << [user, :master]
+
+    project.stub(:branches).and_return(['master', 'foo/bar/baz'])
+    project.stub(:tags).and_return(['v1.0.0', 'v2.0.0'])
+    controller.instance_variable_set(:@project, project)
+  end
+
+  describe "POST create" do
+    render_views
+
+    before {
+      post :create,
+        project_id: project.to_param,
+        branch_name: branch,
+        ref: ref
+    }
+
+    context "valid branch name, valid source" do
+      let(:branch) { "merge_branch" }
+      let(:ref) { "master" }
+      it { should redirect_to("/#{project.path_with_namespace}/tree/merge_branch") }
+    end
+
+    context "invalid branch name, valid ref" do
+      let(:branch) { "<script>alert('merge');</script>" }
+      let(:ref) { "master" }
+      it { should redirect_to("/#{project.path_with_namespace}/tree/alert('merge');") }
+    end
+
+    context "valid branch name, invalid ref" do
+      let(:branch) { "merge_branch" }
+      let(:ref) { "<script>alert('ref');</script>" }
+      it { should render_template("new") }
+    end
+
+    context "invalid branch name, invalid ref" do
+      let(:branch) { "<script>alert('merge');</script>" }
+      let(:ref) { "<script>alert('ref');</script>" }
+      it { should render_template("new") }
+    end
+  end
+end