Add testing for plugin expunge command

test/unit/plugins/commands/plugin/action/expunge_plugins_test.rb

@@ -0,0 +1,64 @@
+require File.expand_path("../../../../../base", __FILE__)
+
+describe VagrantPlugins::CommandPlugin::Action::ExpungePlugins do
+  let(:app) { lambda { |env| } }
+  let(:home_path){ '/fake/file/path/.vagrant.d' }
+  let(:gems_path){ "#{home_path}/gems" }
+  let(:force){ true }
+  let(:env) {{
+    ui: Vagrant::UI::Silent.new,
+    home_path: home_path,
+    gems_path: gems_path,
+    force: force
+  }}
+
+  let(:manager) { double("manager") }
+
+  let(:expect_to_receive) do
+    lambda do
+      allow(File).to receive(:exist?).with(File.join(home_path, 'plugins.json')).and_return(true)
+      allow(File).to receive(:directory?).with(gems_path).and_return(true)
+      expect(FileUtils).to receive(:rm).with(File.join(home_path, 'plugins.json'))
+      expect(FileUtils).to receive(:rm_rf).with(gems_path)
+      expect(app).to receive(:call).with(env).once
+    end
+  end
+
+  subject { described_class.new(app, env) }
+
+  before do
+    Vagrant::Plugin::Manager.stub(instance: manager)
+  end
+
+  describe "#call" do
+    before do
+      instance_exec(&expect_to_receive)
+    end
+
+    it "should delete all plugins" do
+      subject.call(env)
+    end
+
+    describe "when force is false" do
+      let(:force){ false }
+
+      it "should prompt user before deleting all plugins" do
+        expect(env[:ui]).to receive(:ask).and_return("Y\n")
+        subject.call(env)
+      end
+
+      describe "when user declines prompt" do
+        let(:expect_to_receive) do
+          lambda do
+            expect(app).not_to receive(:call)
+          end
+        end
+
+        it "should not delete all plugins" do
+          expect(env[:ui]).to receive(:ask).and_return("N\n")
+          subject.call(env)
+        end
+      end
+    end
+  end
+end