Initial setup for the test environment in puppet-heat

Change-Id: I2a8523bb503cec68e278542100be35bfac12cba9
Signed-off-by: Francesco Vollero <fvollero@redhat.com>

spec/shared_examples.rb

@@ -0,0 +1,5 @@
+shared_examples_for "a Puppet::Error" do |description|
+  it "with message matching #{description.inspect}" do
+    expect { should have_class_count(1) }.to raise_error(Puppet::Error, description)
+  end
+end

spec/spec_helper.rb

@@ -1 +1,7 @@
 require 'puppetlabs_spec_helper/module_spec_helper'
+require 'shared_examples'
+
+RSpec.configure do |c|
+  c.alias_it_should_behave_like_to :it_configures, 'configures'
+  c.alias_it_should_behave_like_to :it_raises, 'raises'
+end