Proof of concept

.gitignore

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+*.gem

lib/puppet-rspec.rb

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+require 'puppet'
+require 'puppet-rspec/matchers/exec'

lib/puppet-rspec/matchers/exec.rb

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+module PuppetRSpec
+  module Matchers
+    extend RSpec::Matchers::DSL
+
+    matcher :create_exec do |expected_title|
+      match do |catalogue|
+        ret = true
+        resources = catalogue.resources.select { |r|
+          r.title == expected_title if r.respond_to? :title
+        }
+
+        unless resources.length == 1
+          ret = false
+        end
+
+        unless @expected_command.nil?
+          unless resources.first.send(:parameters)[:command] == @expected_command
+            ret = false
+          end
+        end
+        ret
+      end
+      description do
+        "create Exec['#{expected_title}']"
+      end
+      failure_message_for_should do |actual|
+        "expected that the catalogue would contain Exec['#{expected_title}']"
+      end
+      chain :with_command do |expected_command|
+        @expected_command = expected_command
+      end
+    end
+  end
+end

puppet-rspec.gemspec

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+Gem::Specification.new do |s|
+  s.name = 'puppet-rspec'
+  s.version = '0.0.1'
+  s.homepage = 'https://github.com/rodjek/puppet-rspec/'
+  s.summary = ''
+  s.description = ''
+
+  s.files = [
+    'puppet-rspec.gemspec',
+    'lib/puppet-rspec.rb',
+    'lib/puppet-rspec/matchers/exec.rb'
+  ]
+
+  s.add_dependency 'rspec'
+
+  s.authors = ['Tim Sharpe']
+  s.email = 'tim@sharpe.id.au'
+end