Check that content_for is cleared

spec/views/common/validation_error.html.erb_spec.rb

@@ -0,0 +1,15 @@
+require 'spec_helper'
+
+describe "common/_validation_error" do
+  let(:error_message) { ["Something went completely wrong!"] }
+
+  before do
+    view.content_for(:error_details, 'Clear this!')
+
+    render partial: "common/validation_error.html.erb",
+           locals: { error_messages: error_message,
+                     object_name: "Test" }
+  end
+
+  it { expect(view.content_for(:error_details)).not_to include('Clear this!') }
+end