diff --git a/lib/pdk/module/metadata.rb b/lib/pdk/module/metadata.rb
index 56b3ab860..9d4eade7e 100644
--- a/lib/pdk/module/metadata.rb
+++ b/lib/pdk/module/metadata.rb
@@ -74,6 +74,8 @@ class Metadata
         'Windows'
       ].freeze
 
+      PUPPET_REQUIREMENT_NAMES = ['puppet', 'openvox'].freeze
+
       DEFAULTS = {
         'name' => nil,
         'version' => '0.1.0',
@@ -157,7 +159,7 @@ def validate_puppet_version_requirement!
 
       def puppet_requirement
         @data['requirements'].find do |r|
-          r.key?('name') && ['puppet', 'openvox'].include? r['name']
+          r.key?('name') && PUPPET_REQUIREMENT_NAMES.include?(r['name'])
         end
       end
 
diff --git a/spec/unit/pdk/config/validator_spec.rb b/spec/unit/pdk/config/validator_spec.rb
new file mode 100644
index 000000000..6944200c5
--- /dev/null
+++ b/spec/unit/pdk/config/validator_spec.rb
@@ -0,0 +1,72 @@
+require 'spec_helper'
+require 'pdk/config/validator'
+
+describe PDK::Config::Validator do
+  describe '.boolean' do
+    subject(:validator) { described_class.boolean }
+
+    it 'returns a hash with a :proc and :message' do
+      expect(validator).to include(:proc, :message)
+    end
+
+    it 'has the correct error message' do
+      expect(validator[:message]).to eq('must be a boolean: true or false')
+    end
+
+    describe 'the validation proc' do
+      subject(:validate) { validator[:proc] }
+
+      it 'accepts true' do
+        expect(validate.call(true)).to be_truthy
+      end
+
+      it 'accepts false' do
+        expect(validate.call(false)).to be_truthy
+      end
+
+      it 'rejects a string' do
+        expect(validate.call('true')).to be_falsey
+      end
+
+      it 'rejects nil' do
+        expect(validate.call(nil)).to be_falsey
+      end
+
+      it 'rejects an integer' do
+        expect(validate.call(1)).to be_falsey
+      end
+    end
+  end
+
+  describe '.uuid' do
+    subject(:validator) { described_class.uuid }
+
+    it 'returns a hash with a :proc and :message' do
+      expect(validator).to include(:proc, :message)
+    end
+
+    it 'has the correct error message' do
+      expect(validator[:message]).to eq('must be a version 4 UUID')
+    end
+
+    describe 'the validation proc' do
+      subject(:validate) { validator[:proc] }
+
+      it 'accepts a valid UUID' do
+        expect(validate.call('550e8400-e29b-41d4-a716-446655440000')).to be_truthy
+      end
+
+      it 'rejects a string that is not a UUID' do
+        expect(validate.call('not-a-uuid')).to be_falsey
+      end
+
+      it 'rejects an empty string' do
+        expect(validate.call('')).to be_falsey
+      end
+
+      it 'rejects a UUID with wrong segment lengths' do
+        expect(validate.call('550e8400-e29b-a716-446655440000')).to be_falsey
+      end
+    end
+  end
+end
diff --git a/spec/unit/pdk/generate/fact_spec.rb b/spec/unit/pdk/generate/fact_spec.rb
new file mode 100644
index 000000000..fd2d78ed9
--- /dev/null
+++ b/spec/unit/pdk/generate/fact_spec.rb
@@ -0,0 +1,53 @@
+require 'spec_helper'
+require 'pdk/generate/fact'
+
+describe PDK::Generate::Fact do
+  subject(:generator) { described_class.new(context, given_name, options) }
+
+  let(:context) { PDK::Context::Module.new(module_dir, module_dir) }
+  let(:module_dir) { '/tmp/test_module' }
+  let(:options) { {} }
+  let(:given_name) { 'my_fact' }
+
+  it 'inherits from PuppetObject' do
+    expect(generator).to be_a(PDK::Generate::PuppetObject)
+  end
+
+  describe '#friendly_name' do
+    it 'returns a human-readable name' do
+      expect(generator.friendly_name).to eq('Custom Fact')
+    end
+  end
+
+  describe '#template_files' do
+    context 'when spec_only is true' do
+      let(:options) { { spec_only: true } }
+
+      it 'only returns the spec template file' do
+        expect(generator.template_files.keys).to eq(['fact_spec.erb'])
+      end
+
+      it 'maps the spec template to the correct destination path' do
+        expect(generator.template_files['fact_spec.erb']).to eq("#{File.join('spec', 'unit', 'facter', given_name)}_spec.rb")
+      end
+    end
+
+    context 'when spec_only is false' do
+      let(:options) { { spec_only: false } }
+
+      it 'returns both the spec and implementation template files' do
+        expect(generator.template_files.keys).to contain_exactly('fact_spec.erb', 'fact.erb')
+      end
+
+      it 'maps the implementation template to the correct destination path' do
+        expect(generator.template_files['fact.erb']).to eq("#{File.join('lib', 'facter', given_name)}.rb")
+      end
+    end
+  end
+
+  describe '#template_data' do
+    it 'returns the object name' do
+      expect(generator.template_data).to eq(name: given_name)
+    end
+  end
+end
diff --git a/spec/unit/pdk/generate/function_spec.rb b/spec/unit/pdk/generate/function_spec.rb
new file mode 100644
index 000000000..6d8b14cef
--- /dev/null
+++ b/spec/unit/pdk/generate/function_spec.rb
@@ -0,0 +1,102 @@
+require 'spec_helper'
+require 'pdk/generate/function'
+
+describe PDK::Generate::Function do
+  subject(:generator) { described_class.new(context, given_name, options) }
+
+  let(:context) { PDK::Context::Module.new(module_dir, module_dir) }
+  let(:module_dir) { '/tmp/test_module' }
+  let(:module_name) { 'test_module' }
+  let(:options) { { type: 'v4' } }
+  let(:given_name) { 'test_module::my_func' }
+
+  before do
+    allow(PDK::Util).to receive(:module_metadata).with(module_dir).and_return('name' => "test_author-#{module_name}")
+  end
+
+  it 'inherits from PuppetObject' do
+    expect(generator).to be_a(PDK::Generate::PuppetObject)
+  end
+
+  describe '#initialize' do
+    context 'when the given name already starts with the module name' do
+      let(:given_name) { 'test_module::my_func' }
+
+      it 'keeps the object name unchanged' do
+        expect(generator.object_name).to eq('test_module::my_func')
+      end
+    end
+
+    context 'when the given name does not start with the module name' do
+      let(:given_name) { 'my_func' }
+
+      it 'prepends the module name to the object name' do
+        expect(generator.object_name).to eq('test_module::my_func')
+      end
+    end
+  end
+
+  describe '#friendly_name' do
+    it 'returns a human-readable name' do
+      expect(generator.friendly_name).to eq('Function')
+    end
+  end
+
+  describe '#template_files' do
+    let(:given_name) { 'test_module::my_func' }
+
+    context 'when spec_only is true' do
+      let(:options) { { spec_only: true, type: 'v4' } }
+
+      it 'only returns the spec template file' do
+        expect(generator.template_files.keys).to eq([File.join('functions', 'function_spec.erb')])
+      end
+
+      it 'maps the spec template to the correct destination path' do
+        expected_path = "#{File.join('spec', 'functions', 'my_func')}_spec.rb"
+        expect(generator.template_files[File.join('functions', 'function_spec.erb')]).to eq(expected_path)
+      end
+    end
+
+    context 'when spec_only is false and type is v4' do
+      let(:options) { { spec_only: false, type: 'v4' } }
+
+      it 'includes both spec and implementation template files' do
+        template_file = File.join('functions', 'v4_function.erb')
+        expect(generator.template_files.keys).to contain_exactly(File.join('functions', 'function_spec.erb'), template_file)
+      end
+
+      it 'maps the implementation template to a ruby lib path' do
+        template_file = File.join('functions', 'v4_function.erb')
+        expected_path = "#{File.join('lib', 'puppet', 'functions', module_name, 'my_func')}.rb"
+        expect(generator.template_files[template_file]).to eq(expected_path)
+      end
+    end
+
+    context 'when spec_only is false and type is v3' do
+      let(:options) { { spec_only: false, type: 'v3' } }
+
+      it 'maps the implementation template to a puppet functions path' do
+        template_file = File.join('functions', 'v3_function.erb')
+        expected_path = "#{File.join('functions', 'my_func')}.pp"
+        expect(generator.template_files[template_file]).to eq(expected_path)
+      end
+    end
+  end
+
+  describe '#template_data' do
+    let(:given_name) { 'test_module::my_func' }
+
+    it 'returns the full object name' do
+      expect(generator.template_data[:name]).to eq('test_module::my_func')
+    end
+
+    it 'returns the function short name' do
+      expect(generator.template_data[:func_name]).to eq('my_func')
+    end
+
+    it 'returns the namespace' do
+      expect(generator.template_data[:namespace]).to eq('test_module')
+    end
+  end
+end
diff --git a/spec/unit/pdk/module/metadata_spec.rb b/spec/unit/pdk/module/metadata_spec.rb
index b30150598..e04c84ee3 100644
--- a/spec/unit/pdk/module/metadata_spec.rb
+++ b/spec/unit/pdk/module/metadata_spec.rb
@@ -1,4 +1,5 @@
 require 'spec_helper'
+require 'json'
 require 'pdk/module/metadata'
 
 describe PDK::Module::Metadata do
@@ -202,7 +203,7 @@
       it 'raises an ArgumentError' do
         expect do
           metadata.validate_puppet_version_requirement!
-        end.to raise_error(ArgumentError, /does not contain a "puppet" requirement/i)
+        end.to raise_error(ArgumentError, /does not contain a "puppet" or a "openvox" requirement/i)
       end
     end