diff --git a/.simplecov b/.simplecov
new file mode 100644
index 0000000..7bc45a0
--- /dev/null
+++ b/.simplecov
@@ -0,0 +1,19 @@
+require 'simplecov-rcov'
+SimpleCov.profiles.define 'spec' do
+  add_group 'jenkins_pipeline_builder', '/lib/'
+  add_filter 'spec'
+  coverage_dir 'out/coverage'
+  formatter SimpleCov::Formatter::MultiFormatter[
+                SimpleCov::Formatter::Console,
+                SimpleCov::Formatter::RcovFormatter,
+            ]
+end
+
+class SimpleCov::Formatter::Console
+  def format(result)
+    print "COVERAGE: #{result.covered_percent.round(2)}%\n"
+  end
+end
+
+SimpleCov.start 'spec' #if ENV["COVERAGE"]
+
diff --git a/bin/generate b/bin/generate
index daacd00..8ea42b0 100755
--- a/bin/generate
+++ b/bin/generate
@@ -19,7 +19,6 @@
 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 # THE SOFTWARE.
-#
 
 $LOAD_PATH.unshift(File.expand_path(File.dirname(__FILE__) + '/../lib'))
 require 'jenkins_pipeline_builder'
diff --git a/lib/jenkins_pipeline_builder.rb b/lib/jenkins_pipeline_builder.rb
index 16ade0c..23f8dad 100644
--- a/lib/jenkins_pipeline_builder.rb
+++ b/lib/jenkins_pipeline_builder.rb
@@ -46,12 +46,17 @@ def credentials=(creds)
       @credentials
     end
 
+    def logger
+      @_client.logger
+    end
+
     def registry
       generator.module_registry
     end
   end
 end
 JenkinsPipelineBuilder.generator
+require 'jenkins_pipeline_builder/extensions'
 require 'jenkins_pipeline_builder/builders'
 require 'jenkins_pipeline_builder/job_builder'
 require 'jenkins_pipeline_builder/wrappers'
@@ -64,4 +69,3 @@ def registry
 require 'jenkins_pipeline_builder/cli/list'
 require 'jenkins_pipeline_builder/cli/describe'
 require 'jenkins_pipeline_builder/cli/base'
-require 'jenkins_pipeline_builder/extensions'
diff --git a/lib/jenkins_pipeline_builder/builders.rb b/lib/jenkins_pipeline_builder/builders.rb
index ac7e2a2..52dff22 100644
--- a/lib/jenkins_pipeline_builder/builders.rb
+++ b/lib/jenkins_pipeline_builder/builders.rb
@@ -18,8 +18,6 @@
 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 # THE SOFTWARE.
-#
-require 'jenkins_pipeline_builder/extensions'
 
 builder do
   name :multi_job
diff --git a/lib/jenkins_pipeline_builder/cli/describe.rb b/lib/jenkins_pipeline_builder/cli/describe.rb
index 48186cc..d768b76 100644
--- a/lib/jenkins_pipeline_builder/cli/describe.rb
+++ b/lib/jenkins_pipeline_builder/cli/describe.rb
@@ -27,7 +27,9 @@ module CLI
       klass = Class.new(Thor) do
 
         extensions = JenkinsPipelineBuilder.registry.registry[:job][entry]
-        extensions.each do |key, ext|
+        extensions.each do |key, exts|
+          # TODO: don't just take the first
+          ext = exts.first
           desc key, "Details for #{ext.name}"
           define_method(ext.name) do
             display_module(ext)
diff --git a/lib/jenkins_pipeline_builder/extensions.rb b/lib/jenkins_pipeline_builder/extensions.rb
index c1ce3f6..261efc8 100644
--- a/lib/jenkins_pipeline_builder/extensions.rb
+++ b/lib/jenkins_pipeline_builder/extensions.rb
@@ -1,3 +1,24 @@
+#
+# Copyright (c) 2014 Constant Contact
+#
+# Permission is hereby granted, free of charge, to any person obtaining a copy
+# of this software and associated documentation files (the "Software"), to deal
+# in the Software without restriction, including without limitation the rights
+# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+# copies of the Software, and to permit persons to whom the Software is
+# furnished to do so, subject to the following conditions:
+#
+# The above copyright notice and this permission notice shall be included in
+# all copies or substantial portions of the Software.
+#
+# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+# THE SOFTWARE.
+
 require 'jenkins_pipeline_builder'
 JenkinsPipelineBuilder.registry.entries.each do |type, path|
   singular_type = type.to_s.singularize
@@ -5,6 +26,7 @@
     ext = JenkinsPipelineBuilder::Extension.new
     ext.instance_eval(&block)
     ext.path path
+    ext.type singular_type
     unless ext.valid?
       name = ext.name || 'A plugin with no name provided'
       puts "Encountered errors while registering #{name}"
@@ -19,6 +41,7 @@
 def job_attribute(&block)
   ext = JenkinsPipelineBuilder::Extension.new
   ext.instance_eval(&block)
+  ext.type :job_attribute
   unless ext.valid?
     name = ext.name || 'A plugin with no name provided'
     puts "Encountered errors while registering #{name}"
@@ -38,7 +61,8 @@ class Extension
       jenkins_name: 'No jenkins display name set',
       description: 'No description set',
       path: false,
-      announced: true
+      announced: true,
+      type: false
     }
     DSL_METHODS.keys.each do |method_name|
       define_method method_name do |value = nil|
diff --git a/lib/jenkins_pipeline_builder/generator.rb b/lib/jenkins_pipeline_builder/generator.rb
index fb6c91f..50cdcf8 100644
--- a/lib/jenkins_pipeline_builder/generator.rb
+++ b/lib/jenkins_pipeline_builder/generator.rb
@@ -45,7 +45,11 @@ def initialize
 
     def debug=(value)
       @debug = value
-      @logger.level = (value) ? Logger::DEBUG : Logger::INFO
+      logger.level = (value) ? Logger::DEBUG : Logger::INFO
+    end
+
+    def logger
+      JenkinsPipelineBuilder.logger
     end
 
     def client
@@ -66,7 +70,7 @@ def view
     def load_collection_from_path(path, recursively = false, remote = false)
       path = File.expand_path(path, Dir.getwd)
       if File.directory?(path)
-        @logger.info "Generating from folder #{path}"
+        logger.info "Generating from folder #{path}"
         Dir[File.join(path, '/*.yaml'), File.join(path, '/*.yml')].each do |file|
           if File.directory?(file) # TODO: This doesn't work unless the folder contains .yml or .yaml at the end
             if recursively
@@ -75,12 +79,12 @@ def load_collection_from_path(path, recursively = false, remote = false)
               next
             end
           end
-          @logger.info "Loading file #{file}"
+          logger.info "Loading file #{file}"
           yaml = YAML.load_file(file)
           load_job_collection(yaml, remote)
         end
       else
-        @logger.info "Loading file #{path}"
+        logger.info "Loading file #{path}"
         yaml = YAML.load_file(path)
         load_job_collection(yaml, remote)
       end
@@ -92,14 +96,14 @@ def load_job_collection(yaml, remote = false)
         key = section.keys.first
         value = section[key]
         if key == :dependencies
-          @logger.info 'Resolving Dependencies for remote project'
+          logger.info 'Resolving Dependencies for remote project'
           load_remote_yaml(value)
           next
         end
         name = value[:name]
         if @job_collection.key?(name)
           if remote
-            @logger.info "Duplicate item with name '#{name}' was detected from the remote folder."
+            logger.info "Duplicate item with name '#{name}' was detected from the remote folder."
           else
             fail "Duplicate item with name '#{name}' was detected."
           end
@@ -118,10 +122,10 @@ def load_extensions(path)
       path = File.expand_path(path, Dir.getwd)
       return unless File.directory?(path)
 
-      @logger.info "Loading extensions from folder #{path}"
-      @logger.info Dir.glob("#{path}/*.rb").inspect
+      logger.info "Loading extensions from folder #{path}"
+      logger.info Dir.glob("#{path}/*.rb").inspect
       Dir.glob("#{path}/*.rb").each do |file|
-        @logger.info "Loaded #{file}"
+        logger.info "Loaded #{file}"
         require file
       end
       match_extension_versions
@@ -130,7 +134,7 @@ def load_extensions(path)
     def match_extension_versions
       registry = @module_registry.registry[:job]
       installed_plugins = @debug ? nil : list_plugins # Only get plugins if not in debug mode
-      @logger.debug 'Loading newest version of all plugins since we are in debug mode.'
+      logger.debug 'Loading newest version of all plugins since we are in debug mode.'
       registry.each do |registry_key, registry_value|
         if registry_value[:registry]
           registry_value[:registry].each do |extension_key, extension_value|
@@ -178,7 +182,7 @@ def load_template(path, template)
       end
 
       if File.directory?(path)
-        @logger.info "Loading from #{path}"
+        logger.info "Loading from #{path}"
         load_collection_from_path(path, false, true)
         true
       else
@@ -188,7 +192,7 @@ def load_template(path, template)
 
     def download_yaml(url, file)
       @remote_depends[url] = file
-      @logger.info "Downloading #{url} to #{file}.tar"
+      logger.info "Downloading #{url} to #{file}.tar"
       open("#{file}.tar", 'w') do |local_file|
         open(url) do |remote_file|
           local_file.write(Zlib::GzipReader.new(remote_file).read)
@@ -196,7 +200,7 @@ def download_yaml(url, file)
       end
 
       # Extract Tar.gz to 'remote' folder
-      @logger.info "Unpacking #{file}.tar to #{file} folder"
+      logger.info "Unpacking #{file}.tar to #{file} folder"
       Archive::Tar::Minitar.unpack("#{file}.tar", file)
     end
 
@@ -216,7 +220,7 @@ def load_remote_yaml(dependencies)
         path = File.expand_path(file, Dir.getwd)
         # Load templates recursively
         unless source[:templates]
-          @logger.info 'No specific template specified'
+          logger.info 'No specific template specified'
           # Try to load the folder or the pipeline folder
           path = File.join(path, 'pipeline') if Dir.entries(path).include? 'pipeline'
           return load_collection_from_path(path)
@@ -229,12 +233,12 @@ def load_remote_yaml(dependencies)
     def load_templates(path, templates)
       templates.each do |template|
         version = template[:version] || 'newest'
-        @logger.info "Loading #{template[:name]} at version #{version}"
+        logger.info "Loading #{template[:name]} at version #{version}"
         # Move into the remote folder and look for the template folder
         remote = Dir.entries(path)
         if remote.include? template[:name]
           # We found the template name, load this path
-          @logger.info 'We found the template!'
+          logger.info 'We found the template!'
           load_template(path, template)
         else
           # Many cases we must dig one layer deep
@@ -312,7 +316,7 @@ def resolve_project(project)
       project_body = project[:value]
 
       jobs = prepare_jobs(project_body[:jobs]) if project_body[:jobs]
-      @logger.info project
+      logger.info project
       process_job_changes(jobs)
       errors = process_jobs(jobs, project)
       errors = process_views(project_body[:views], project,  errors) if project_body[:views]
@@ -333,7 +337,7 @@ def resolve_job_by_name(name, settings = {})
       job = get_item(name)
       fail "Failed to locate job by name '#{name}'" if job.nil?
       job_value = job[:value]
-      @logger.debug "Compiling job #{name}"
+      logger.debug "Compiling job #{name}"
       success, payload = Compiler.compile(job_value, settings, @job_collection)
       [success, payload]
     end
@@ -395,9 +399,9 @@ def publish_jobs(jobs, errors = {})
     end
 
     def bootstrap(path, project_name)
-      @logger.info "Bootstrapping pipeline from path #{path}"
+      logger.info "Bootstrapping pipeline from path #{path}"
       load_collection_from_path(path)
-      @logger.info @job_collection
+      logger.info @job_collection
       cleanup_temp_remote
       load_extensions(path)
       errors = {}
@@ -408,23 +412,23 @@ def bootstrap(path, project_name)
         errors = publish_project(project_name)
       end
       errors.each do |k, v|
-        @logger.error "Encountered errors compiling: #{k}:"
-        @logger.error v
+        logger.error "Encountered errors compiling: #{k}:"
+        logger.error v
       end
     end
 
     def pull_request(path, project_name)
-      @logger.info "Pull Request Generator Running from path #{path}"
+      logger.info "Pull Request Generator Running from path #{path}"
       load_collection_from_path(path)
       cleanup_temp_remote
       load_extensions(path)
       jobs = {}
-      @logger.info "Project: #{projects}"
+      logger.info "Project: #{projects}"
       projects.each do |project|
         if project[:name] == project_name || project_name.nil?
           project_body = project[:value]
           project_jobs = project_body[:jobs] || []
-          @logger.info "Using Project #{project}"
+          logger.info "Using Project #{project}"
           pull_job = nil
           project_jobs.each do |job|
             job = job.keys.first if job.is_a? Hash
@@ -463,8 +467,8 @@ def pull_request(path, project_name)
     end
 
     def dump(job_name)
-      @logger.info "Debug #{@debug}"
-      @logger.info "Dumping #{job_name} into #{job_name}.xml"
+      logger.info "Debug #{@debug}"
+      logger.info "Dumping #{job_name} into #{job_name}.xml"
       xml = client.job.get_config(job_name)
       File.open(job_name + '.xml', 'w') { |f| f.write xml }
     end
@@ -472,8 +476,8 @@ def dump(job_name)
     def create_or_update(job, xml)
       job_name = job[:name]
       if @debug
-        @logger.info "Will create job #{job}"
-        @logger.info "#{xml}"
+        logger.info "Will create job #{job}"
+        logger.info "#{xml}"
         File.open(job_name + '.xml', 'w') { |f| f.write xml }
         return
       end
@@ -488,7 +492,7 @@ def create_or_update(job, xml)
     def compile_job_to_xml(job)
       fail 'Job name is not specified' unless job[:name]
 
-      @logger.info "Creating Yaml Job #{job}"
+      logger.info "Creating Yaml Job #{job}"
       job[:job_type] = 'free_style' unless job[:job_type]
       case job[:job_type]
       when 'job_dsl'
@@ -530,7 +534,9 @@ def compile_freestyle_job_to_xml(params)
       xml   = client.job.build_freestyle_config(params)
       n_xml = Nokogiri::XML(xml)
 
+      logger.debug 'Loading the required modules'
       @module_registry.traverse_registry_path('job', params, n_xml)
+      logger.debug 'Module loading complete'
 
       n_xml.to_xml
     end
@@ -555,7 +561,7 @@ def update_job_dsl(job, xml)
     end
 
     def generate_job_dsl_body(params)
-      @logger.info 'Generating pipeline'
+      logger.info 'Generating pipeline'
 
       xml = client.job.build_freestyle_config(params)
 
diff --git a/lib/jenkins_pipeline_builder/module_registry.rb b/lib/jenkins_pipeline_builder/module_registry.rb
index 2a26f7b..9f6f321 100644
--- a/lib/jenkins_pipeline_builder/module_registry.rb
+++ b/lib/jenkins_pipeline_builder/module_registry.rb
@@ -27,6 +27,10 @@ def initialize
       @registry = { job: {} }
     end
 
+    def logger
+      JenkinsPipelineBuilder.logger
+    end
+
     # Ideally refactor this out to be derived from the registry,
     # but I'm lazy for now
     def entries
@@ -43,7 +47,8 @@ def register(prefix, extension)
       root = prefix.inject(@registry, :[])
       root[name] = {} unless root[name]
 
-      root[name][extension.name] = extension
+      root[name][extension.name] = [] unless root[name][extension.name]
+      root[name][extension.name] << extension
     end
 
     def get(path)
@@ -63,17 +68,25 @@ def traverse_registry_path(path, params, n_xml)
       traverse_registry(registry, params, n_xml)
     end
 
-    def traverse_registry(registry, params, n_xml)
+    def traverse_registry(registry, params, n_xml, strict = false)
       params.each do |key, value|
         if registry.is_a? Hash
-          next unless registry.key? key
-          if registry[key].is_a? Extension
-            execute_extension(registry[key], value, n_xml)
+          unless registry.key? key
+            fail "!!!! could not find key #{key} !!!!" if strict
+            next
+          end
+          reg_value = registry[key]
+          if reg_value.is_a?(Array) && reg_value.first.is_a?(Extension)
+            next unless reg_value.select { |x| x.class == Extension }.size == reg_value.size
+            # TODO: Actually compare versions installed on box here
+            reg = reg_value.sort { |x, y| x.min_version <=> y.min_version }.last
+            logger.debug "Using #{reg.type} #{reg.name} version #{reg.min_version}"
+            execute_extension(reg, value, n_xml)
           elsif value.is_a? Hash
-            traverse_registry registry[key], value, n_xml
+            traverse_registry reg_value, value, n_xml, true
           elsif value.is_a? Array
             value.each do |v|
-              traverse_registry registry[key], v, n_xml
+              traverse_registry reg_value, v, n_xml, true
             end
           end
         end
@@ -86,6 +99,7 @@ def execute_extension(extension, value, n_xml)
       Nokogiri::XML::Builder.with(n_builders) do |xml|
         xml.instance_exec value, &extension.xml
       end
+      n_builders.instance_exec(value, &extension.after) if extension.after
     end
   end
 end
diff --git a/lib/jenkins_pipeline_builder/publishers.rb b/lib/jenkins_pipeline_builder/publishers.rb
index 47dd7cc..b7d4b5d 100644
--- a/lib/jenkins_pipeline_builder/publishers.rb
+++ b/lib/jenkins_pipeline_builder/publishers.rb
@@ -18,8 +18,6 @@
 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 # THE SOFTWARE.
-#
-require 'jenkins_pipeline_builder/extensions'
 
 publisher do
   name :description_setter
diff --git a/lib/jenkins_pipeline_builder/triggers.rb b/lib/jenkins_pipeline_builder/triggers.rb
index 74bb481..9383f28 100644
--- a/lib/jenkins_pipeline_builder/triggers.rb
+++ b/lib/jenkins_pipeline_builder/triggers.rb
@@ -18,8 +18,6 @@
 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 # THE SOFTWARE.
-#
-require 'jenkins_pipeline_builder/extensions'
 
 trigger do
   name :git_push
diff --git a/lib/jenkins_pipeline_builder/wrappers.rb b/lib/jenkins_pipeline_builder/wrappers.rb
index 0789371..2f82e3b 100644
--- a/lib/jenkins_pipeline_builder/wrappers.rb
+++ b/lib/jenkins_pipeline_builder/wrappers.rb
@@ -20,8 +20,6 @@
 # THE SOFTWARE.
 #
 
-require 'jenkins_pipeline_builder/extensions'
-
 wrapper do
   name :ansicolor
   plugin_id 123
@@ -48,10 +46,11 @@
 end
 
 wrapper do
-  name :rvm05
+  name :rvm
   plugin_id 123
   min_version '0.5'
   announced false
+  description 'rvm plugin for versions 0.5 and greater'
 
   xml do |wrapper|
     send('ruby-proxy-object') do
@@ -78,8 +77,9 @@
 wrapper do
   name :rvm
   plugin_id 123
-  min_version 0
+  min_version '0'
   announced false
+  description 'rvm plugin for versions less than 0.5'
 
   xml do |wrapper|
     send('ruby-proxy-object') do
diff --git a/spec/func_tests/spec_helper.rb b/spec/func_tests/spec_helper.rb
index a409159..aac3340 100644
--- a/spec/func_tests/spec_helper.rb
+++ b/spec/func_tests/spec_helper.rb
@@ -2,9 +2,6 @@
 require 'rspec'
 require 'webmock/rspec'
 require 'simplecov'
-require 'simplecov-rcov'
-
-SimpleCov.start if ENV['COVERAGE']
 
 require File.expand_path('../../../lib/jenkins_pipeline_builder', __FILE__)
 
diff --git a/spec/unit_tests/compiler_spec.rb b/spec/unit_tests/compiler_spec.rb
index 8a2b4b8..15fcec6 100644
--- a/spec/unit_tests/compiler_spec.rb
+++ b/spec/unit_tests/compiler_spec.rb
@@ -14,7 +14,7 @@
 
     success, result = JenkinsPipelineBuilder::Compiler.compile(hash)
 
-    expect(success).to be_true
+    expect(success).to be true
     result.should == hash
   end
 end
diff --git a/spec/unit_tests/module_registry_spec.rb b/spec/unit_tests/module_registry_spec.rb
index 16230f7..f978f33 100644
--- a/spec/unit_tests/module_registry_spec.rb
+++ b/spec/unit_tests/module_registry_spec.rb
@@ -10,6 +10,111 @@
     allow(ext).to receive(:name).and_return :foo
     registry.register [:job], ext
 
-    expect(registry.get('job/foo').name).to eq :foo
+    expect(registry.get('job/foo').first.name).to eq :foo
+  end
+
+  it 'registered the builders correctly' do
+    builders = {
+      multi_job: [0],
+      maven3: [0],
+      shell_command: [0],
+      inject_vars_file: [0],
+      blocking_downstream: [0],
+      remote_job: [0],
+      copy_artifact: [0]
+    }
+    registry = JenkinsPipelineBuilder.registry.registry
+    expect(registry[:job][:builders].size).to eq builders.size
+    builders.each do |builder, versions|
+      expect(registry[:job][:builders]).to have_key builder
+
+      versions.each do |version|
+        expect(registry[:job][:builders][builder]).to have_min_version version
+      end
+    end
+  end
+  it 'registered the triggers correctly' do
+    triggers = {
+      git_push: [0],
+      scm_polling: [0],
+      periodic_build: [0],
+      upstream: [0]
+    }
+    registry = JenkinsPipelineBuilder.registry.registry
+    expect(registry[:job][:triggers].size).to eq triggers.size
+    triggers.each do |trigger, versions|
+      expect(registry[:job][:triggers]).to have_key trigger
+
+      versions.each do |version|
+        expect(registry[:job][:triggers][trigger]).to have_min_version version
+      end
+    end
+  end
+  it 'registered the job_attributes correctly' do
+    job_attributes = {
+      description: [0],
+      scm_params: [0],
+      hipchat: [0],
+      priority: [0],
+      parameters: [0],
+      discard_old: [0],
+      throttle: [0],
+      prepare_environment: [0],
+      concurrent_build: [0]
+    }
+    registry = JenkinsPipelineBuilder.registry.registry
+    # There are 4 sub types so, we don't count those
+    expect(registry[:job].size - 4).to eq job_attributes.size
+    job_attributes.each do |job_attribute, versions|
+      expect(registry[:job]).to have_key job_attribute
+
+      versions.each do |version|
+        expect(registry[:job][job_attribute]).to have_min_version version
+      end
+    end
+  end
+  it 'registered the publishers correctly' do
+    publishers = {
+      description_setter: [0],
+      downstream: [0],
+      hipchat: [0],
+      git: [0],
+      junit_result: [0],
+      coverage_result: [0],
+      post_build_script: [0],
+      groovy_postbuild: [0],
+      archive_artifact: [0],
+      email_notifications: [0]
+    }
+    registry = JenkinsPipelineBuilder.registry.registry
+    expect(registry[:job][:publishers].size).to eq publishers.size
+    publishers.each do |publisher, versions|
+      expect(registry[:job][:publishers]).to have_key publisher
+
+      versions.each do |version|
+        expect(registry[:job][:publishers][publisher]).to have_min_version version
+      end
+    end
+  end
+  it 'registered the wrappers correctly' do
+    wrappers = {
+      ansicolor: [0],
+      timestamp: [0],
+      name: [0],
+      rvm: ['0', '0.5'],
+      inject_passwords: [0],
+      inject_env_var: [0],
+      artifactory: [0],
+      maven3artifactory: [0]
+    }
+    registry = JenkinsPipelineBuilder.registry.registry
+    expect(registry[:job][:wrappers].size).to eq wrappers.size
+    wrappers.each do |wrapper, versions|
+      expect(registry[:job][:wrappers]).to have_key wrapper
+
+      versions.each do |version|
+        expect(registry[:job][:wrappers][wrapper]).to have_min_version version
+      end
+    end
   end
 end
diff --git a/spec/unit_tests/resolve_dependencies_spec.rb b/spec/unit_tests/resolve_dependencies_spec.rb
index 4d68336..403d10d 100644
--- a/spec/unit_tests/resolve_dependencies_spec.rb
+++ b/spec/unit_tests/resolve_dependencies_spec.rb
@@ -69,7 +69,7 @@
 
     success, project = @generator.resolve_project(@generator.get_item('project-name'))
 
-    expect(success).to be_true
+    expect(success).to be true
     expect(project).to eq(
       name: 'project-name',
       type: :project,
@@ -126,7 +126,7 @@
     @generator.load_job_collection project
 
     success, project = @generator.resolve_project(@generator.get_item('project-name'))
-    expect(success).to be_true
+    expect(success).to be true
     expect(project).to eq(
       name: 'project-name',
       type: :project,
@@ -181,7 +181,7 @@
     @generator.load_job_collection project
 
     success, project = @generator.resolve_project(@generator.get_item('project-name'))
-    expect(success).to be_true
+    expect(success).to be true
     expect(project).to eq(
       name: 'project-name',
       type: :project,
@@ -210,19 +210,19 @@
   describe 'compilation of templates' do
     it 'compiles String' do
       success, string = JenkinsPipelineBuilder::Compiler.compile('blah', item1: 'data1')
-      expect(success).to be_true
+      expect(success).to be true
       expect(string).to eq 'blah'
     end
 
     it 'compiles simple Hash' do
       success, hash = JenkinsPipelineBuilder::Compiler.compile({ name: 'item-{{item1}}', value: 'item1-data' }, item1: 'data1')
-      expect(success).to be_true
+      expect(success).to be true
       expect(hash).to eq(name: 'item-data1', value: 'item1-data')
     end
 
     it 'compiles nested Hash' do
       success, hash = JenkinsPipelineBuilder::Compiler.compile({ name: 'item-{{item1}}', value: { house: 'house-{{item1}}' } }, item1: 'data1')
-      expect(success).to be_true
+      expect(success).to be true
       expect(hash).to eq(name: 'item-data1', value: { house: 'house-data1' })
     end
 
@@ -233,7 +233,7 @@
       settings = { name: 'project-name', db: 'my_own_db', :'mail-to' => 'developer@nowhere.net' }
 
       success, hash = JenkinsPipelineBuilder::Compiler.compile(template, settings)
-      expect(success).to be_true
+      expect(success).to be true
       expect(hash).to eq(
           name: 'project-name-unit-tests',
           builders: [{ shell: 'unittest' }],
@@ -249,7 +249,7 @@
     @generator.load_job_collection project
 
     success, job = @generator.resolve_job_by_name('{{name}}-unit-tests', name: 'project-name', db: 'my_own_db', :'mail-to' => 'developer@nowhere.net')
-    expect(success).to be_true
+    expect(success).to be true
     expect(job).to eq(
       name: 'project-name-unit-tests',
       builders: [{ shell: 'unittest' }],
diff --git a/spec/unit_tests/spec_helper.rb b/spec/unit_tests/spec_helper.rb
index bea536b..981ac03 100644
--- a/spec/unit_tests/spec_helper.rb
+++ b/spec/unit_tests/spec_helper.rb
@@ -5,23 +5,6 @@
 require 'simplecov-rcov'
 require 'webmock/rspec'
 
-SimpleCov.profiles.define 'spec' do
-  add_group 'jenkins_pipeline_builder', '/lib/'
-  coverage_dir 'out/coverage'
-  formatter SimpleCov::Formatter::MultiFormatter[
-                SimpleCov::Formatter::Console,
-                SimpleCov::Formatter::RcovFormatter,
-            ]
-end
-
-class SimpleCov::Formatter::Console
-  def format(result)
-    print "COVERAGE: #{result.covered_percent.round(2)}%\n"
-  end
-end
-
-SimpleCov.start 'spec' # if ENV["COVERAGE"]
-
 require File.expand_path('../../../lib/jenkins_pipeline_builder', __FILE__)
 require 'rspec/matchers'
 require 'equivalent-xml'
@@ -30,3 +13,14 @@ def format(result)
   config.before(:each) do
   end
 end
+
+RSpec::Matchers.define :have_min_version do |version|
+  match do |base|
+    @exts = base
+    !base.select { |ext| ext.min_version == version }.empty?
+  end
+
+  failure_message_for_should do
+    "Expected to find extension #{@exts.first.name} with version #{version}, found #{@exts.map { |x| x.min_version }.join(', ')} instead"
+  end
+end