add test for building domain name.

spec/spec_helper.rb

@@ -0,0 +1,5 @@
+require 'vagrant-libvirt'
+require 'support/environment_helper'
+
+RSpec.configure do |spec|
+end

spec/support/environment_helper.rb

@@ -0,0 +1,36 @@
+require "ostruct"
+require "pathname"
+
+class EnvironmentHelper
+
+  attr_writer :default_prefix
+
+  def [](value)
+    self.send(value.to_sym)
+  end
+
+  def machine
+    self
+  end
+
+  def provider_config
+    self
+  end
+
+  def default_prefix
+    # noop 
+  end
+
+  def root_path
+    Pathname.new("./spec/support/foo")
+  end
+
+  def domain_name
+    #noop
+  end
+
+  def libvirt_compute
+    OpenStruct.new(servers: [])
+  end
+
+end

spec/vagrant-libvirt/action/set_name_of_domain_spec.rb

@@ -0,0 +1,14 @@
+require "spec_helper"
+
+describe VagrantPlugins::ProviderLibvirt::Action::SetNameOfDomain do
+  before :each do
+    @env = EnvironmentHelper.new
+  end
+
+  it "builds uniqie domain name" do
+    dmn = VagrantPlugins::ProviderLibvirt::Action::SetNameOfDomain.new(Object.new, @env)
+    first  = dmn.build_domain_name(@env)
+    second = dmn.build_domain_name(@env)
+    first.should_not eq(second) 
+  end
+end