diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index bdbc54b..9129f95 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -10,22 +10,10 @@ require 'bundler/setup'
 
 require 'i18n'
 
-require 'rspec-spies'
+require 'vagrant-lxc/plugin'
 
 Dir[File.dirname(__FILE__) + "/support/**/*.rb"].each { |f| require f }
 
-# If we should verify constant names, eager loads
-if ENV['VERIFY_CONSTANT_NAMES']
-  require 'vagrant-lxc/plugin'
-  require 'vagrant-lxc/provider'
-  require 'vagrant-lxc/config'
-end
-
-require 'rspec/fire'
-RSpec::Fire.configure do |config|
-  config.verify_constant_names = ENV['VERIFY_CONSTANT_NAMES'] == '1'
-end
-
 RSpec.configure do |config|
   config.treat_symbols_as_metadata_keys_with_true_values = true
   config.run_all_when_everything_filtered = true
diff --git a/spec/unit/action/compress_rootfs_spec.rb b/spec/unit/action/compress_rootfs_spec.rb
index 2a70ba4..0a81c72 100644
--- a/spec/unit/action/compress_rootfs_spec.rb
+++ b/spec/unit/action/compress_rootfs_spec.rb
@@ -1,13 +1,15 @@
 require 'unit_helper'
 
+require 'vagrant-lxc/plugin'
+require 'vagrant-lxc/provider'
 require 'vagrant-lxc/action/compress_rootfs'
 
 describe Vagrant::LXC::Action::CompressRootFS do
   let(:app)                    { double(:app, call: true) }
   let(:env)                    { {machine: machine, ui: double(info: true)} }
-  let(:machine)                { instance_double('Vagrant::Machine', provider: provider) }
-  let(:provider)               { instance_double('Vagrant::LXC::Provider', driver: driver) }
-  let(:driver)                 { instance_double('Vagrant::LXC::Driver', compress_rootfs: compressed_rootfs_path) }
+  let(:machine)                { double(Vagrant::Machine, provider: provider) }
+  let(:provider)               { double(Vagrant::LXC::Provider, driver: driver) }
+  let(:driver)                 { double(Vagrant::LXC::Driver, compress_rootfs: compressed_rootfs_path) }
   let(:compressed_rootfs_path) { '/path/to/rootfs.tar.gz' }
 
   subject { described_class.new(app, env) }
diff --git a/spec/unit/action/forward_ports_spec.rb b/spec/unit/action/forward_ports_spec.rb
index 126907e..077ee7d 100644
--- a/spec/unit/action/forward_ports_spec.rb
+++ b/spec/unit/action/forward_ports_spec.rb
@@ -1,7 +1,7 @@
 require 'unit_helper'
 
 require 'tmpdir'
-require 'vagrant-lxc/errors'
+require 'vagrant-lxc/provider'
 require 'vagrant-lxc/action/forward_ports'
 
 describe Vagrant::LXC::Action::ForwardPorts do
@@ -9,7 +9,7 @@ describe Vagrant::LXC::Action::ForwardPorts do
   let(:env)          { {machine: machine, ui: double(info: true)} }
   let(:machine)      { double(:machine) }
   let!(:data_dir)    { Pathname.new(Dir.mktmpdir) }
-  let(:provider)     { instance_double('Vagrant::LXC::Provider', ssh_info: {host: container_ip}) }
+  let(:provider)     { double(Vagrant::LXC::Provider, ssh_info: {host: container_ip}) }
   let(:host_ip)      { '127.0.0.1' }
   let(:host_port)    { 8080 }
   let(:guest_port)   { 80 }
diff --git a/spec/unit/action/handle_box_metadata_spec.rb b/spec/unit/action/handle_box_metadata_spec.rb
index 3208355..78c2ce4 100644
--- a/spec/unit/action/handle_box_metadata_spec.rb
+++ b/spec/unit/action/handle_box_metadata_spec.rb
@@ -102,15 +102,11 @@ describe Vagrant::LXC::Action::HandleBoxMetadata do
     it 'validates box versions' do
       %w( 2 3 1.0.0 ).each do |v|
         metadata['version'] = v
-        expect {
-          subject.call(env)
-        }.to_not raise_error(Vagrant::LXC::Errors::IncompatibleBox)
+        expect { subject.call(env) }.to_not raise_error
       end
 
       metadata['version'] = '1'
-      expect {
-        subject.call(env)
-      }.to raise_error(Vagrant::LXC::Errors::IncompatibleBox)
+      expect { subject.call(env) }.to raise_error
     end
 
     it 'raises an error if the rootfs tarball cant be found' do
diff --git a/spec/unit/action/setup_package_files_spec.rb b/spec/unit/action/setup_package_files_spec.rb
index 6c1c042..cf39158 100644
--- a/spec/unit/action/setup_package_files_spec.rb
+++ b/spec/unit/action/setup_package_files_spec.rb
@@ -5,9 +5,9 @@ require 'vagrant-lxc/action/setup_package_files'
 describe Vagrant::LXC::Action::SetupPackageFiles do
   let(:app)         { double(:app, call: true) }
   let(:env)         { {machine: machine, tmp_path: tmp_path, ui: double(info: true), 'package.rootfs' => rootfs_path} }
-  let(:machine)     { instance_double('Vagrant::Machine', box: box) }
+  let(:machine)     { double(Vagrant::Machine, box: box) }
   let!(:tmp_path)   { Pathname.new(Dir.mktmpdir) }
-  let(:box)         { instance_double('Vagrant::Box', directory: tmp_path.join('box')) }
+  let(:box)         { double(Vagrant::Box, directory: tmp_path.join('box')) }
   let(:rootfs_path) { tmp_path.join('rootfs-amd64.tar.gz') }
 
   subject { described_class.new(app, env) }
diff --git a/spec/unit/driver/cli_spec.rb b/spec/unit/driver/cli_spec.rb
index 9e78353..e2f6c4a 100644
--- a/spec/unit/driver/cli_spec.rb
+++ b/spec/unit/driver/cli_spec.rb
@@ -1,9 +1,10 @@
 require 'unit_helper'
 
+require 'vagrant-lxc/sudo_wrapper'
 require 'vagrant-lxc/driver/cli'
 
 describe Vagrant::LXC::Driver::CLI do
-  let(:sudo_wrapper) { instance_double('Vagrant::LXC::SudoWrapper', run: true) }
+  let(:sudo_wrapper) { double(Vagrant::LXC::SudoWrapper, run: true) }
 
   subject { described_class.new(sudo_wrapper) }
 
@@ -197,6 +198,6 @@ describe Vagrant::LXC::Driver::CLI do
       }.to raise_error(described_class::TransitionBlockNotProvided)
     end
 
-    pending 'waits for the expected container state'
+    skip 'waits for the expected container state'
   end
 end
diff --git a/spec/unit/driver_spec.rb b/spec/unit/driver_spec.rb
index 1b31e22..ad52b29 100644
--- a/spec/unit/driver_spec.rb
+++ b/spec/unit/driver_spec.rb
@@ -1,15 +1,15 @@
 require 'unit_helper'
 
-require 'vagrant'
 require 'vagrant-lxc/driver'
 require 'vagrant-lxc/driver/cli'
+require 'vagrant-lxc/sudo_wrapper'
 
 describe Vagrant::LXC::Driver do
   describe 'container name validation' do
     let(:unknown_container) { described_class.new('unknown', nil, cli) }
     let(:valid_container)   { described_class.new('valid', nil, cli) }
     let(:new_container)     { described_class.new(nil, nil) }
-    let(:cli)               { instance_double('Vagrant::LXC::Driver::CLI', list: ['valid']) }
+    let(:cli)               { double(Vagrant::LXC::Driver::CLI, list: ['valid']) }
 
     it 'raises a ContainerNotFound error if an unknown container name gets provided' do
       expect {
@@ -37,7 +37,7 @@ describe Vagrant::LXC::Driver do
     let(:template_opts)  { {'--some' => 'random-option'} }
     let(:config_file)    { '/path/to/lxc-config-from-box' }
     let(:rootfs_tarball) { '/path/to/cache/rootfs.tar.gz' }
-    let(:cli)            { instance_double('Vagrant::LXC::Driver::CLI', :create => true, :name= => true) }
+    let(:cli)            { double(Vagrant::LXC::Driver::CLI, :create => true, :name= => true) }
 
     subject { described_class.new(nil, nil, cli) }
 
@@ -60,7 +60,7 @@ describe Vagrant::LXC::Driver do
   end
 
   describe 'destruction' do
-    let(:cli) { instance_double('Vagrant::LXC::Driver::CLI', destroy: true) }
+    let(:cli) { double(Vagrant::LXC::Driver::CLI, destroy: true) }
 
     subject { described_class.new('name', nil, cli) }
 
@@ -74,8 +74,8 @@ describe Vagrant::LXC::Driver do
   describe 'start' do
     let(:customizations)         { [['a', '1'], ['b', '2']] }
     let(:internal_customization) { ['internal', 'customization'] }
-    let(:cli)                    { instance_double('Vagrant::LXC::Driver::CLI', start: true) }
-    let(:sudo)                   { instance_double('Vagrant::LXC::SudoWrapper', su_c: true) }
+    let(:cli)                    { double(Vagrant::LXC::Driver::CLI, start: true) }
+    let(:sudo)                   { double(Vagrant::LXC::SudoWrapper, su_c: true) }
 
     subject { described_class.new('name', sudo, cli) }
 
@@ -94,7 +94,7 @@ describe Vagrant::LXC::Driver do
   end
 
   describe 'halt' do
-    let(:cli) { instance_double('Vagrant::LXC::Driver::CLI', shutdown: true) }
+    let(:cli) { double(Vagrant::LXC::Driver::CLI, shutdown: true) }
 
     subject { described_class.new('name', nil, cli) }
 
@@ -129,7 +129,7 @@ describe Vagrant::LXC::Driver do
 
   describe 'state' do
     let(:cli_state) { :something }
-    let(:cli)       { instance_double('Vagrant::LXC::Driver::CLI', state: cli_state) }
+    let(:cli)       { double(Vagrant::LXC::Driver::CLI, state: cli_state) }
 
     subject { described_class.new('name', nil, cli) }
 
@@ -143,7 +143,7 @@ describe Vagrant::LXC::Driver do
     let(:folders)             { [shared_folder] }
     let(:rootfs_path)         { Pathname('/path/to/rootfs') }
     let(:expected_guest_path) { "#{rootfs_path}/vagrant" }
-    let(:sudo_wrapper)        { instance_double('Vagrant::LXC::SudoWrapper', run: true) }
+    let(:sudo_wrapper)        { double(Vagrant::LXC::SudoWrapper, run: true) }
 
     subject { described_class.new('name', sudo_wrapper) }
 
diff --git a/spec/unit_helper.rb b/spec/unit_helper.rb
index 4122faf..844be91 100644
--- a/spec/unit_helper.rb
+++ b/spec/unit_helper.rb
@@ -7,8 +7,6 @@ if defined? SimpleCov
 end
 
 RSpec.configure do |config|
-  config.include RSpec::Fire
-
   config.include UnitExampleGroup, :type => :unit, :example_group => {
     :file_path => /\bspec\/unit\//
   }