Ensure state is fully removed for destroy (#1288)

Completely remove state after a destroy, and ensure removal of a
non-existing domain also scrubs the machine folder clean.

Closes: #1132

spec/unit/action/clean_machine_folder_spec.rb

@@ -0,0 +1,48 @@
+require 'spec_helper'
+require 'support/sharedcontext'
+
+require 'vagrant-libvirt/action/clean_machine_folder'
+
+describe VagrantPlugins::ProviderLibvirt::Action::CleanMachineFolder do
+  subject { described_class.new(app, env) }
+
+  include_context 'unit'
+
+  describe '#call' do
+    context 'with default options' do
+      it 'should verbosely remove the folder' do
+        expect(ui).to receive(:info).with('Deleting the machine folder')
+        expect(FileUtils).to receive(:rm_rf).with(machine.data_dir, {:secure => true})
+
+        expect(subject.call(env)).to be_nil
+      end
+    end
+
+    context 'when the data dir doesn\'t exist' do
+      before do
+        Dir.mktmpdir do |d|
+          # returns a temporary directory that has been already deleted when running
+          expect(machine).to receive(:data_dir).and_return(d.to_s).exactly(2).times
+        end
+      end
+
+      it 'should remove the folder' do
+        expect(ui).to receive(:info).with('Deleting the machine folder')
+        expect(FileUtils).to receive(:rm_rf).with(machine.data_dir, {:secure => true})
+
+        expect(subject.call(env)).to be_nil
+      end
+    end
+
+    context 'with quiet option enabled' do
+      subject { described_class.new(app, env, {:quiet => true}) }
+
+      it 'should quietly remove the folder' do
+        expect(ui).to_not receive(:info).with('Deleting the machine folder')
+        expect(FileUtils).to receive(:rm_rf).with(machine.data_dir, {:secure => true})
+
+        expect(subject.call(env)).to be_nil
+      end
+    end
+  end
+end