commands/plugin: add tests for UpdateGems

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

@@ -0,0 +1,33 @@
+require File.expand_path("../../../../../base", __FILE__)
+
+describe VagrantPlugins::CommandPlugin::Action::UpdateGems do
+  let(:app) { lambda { |env| } }
+  let(:env) {{
+    ui: Vagrant::UI::Silent.new
+  }}
+
+  let(:manager) { double("manager") }
+
+  subject { described_class.new(app, env) }
+
+  before do
+    Vagrant::Plugin::Manager.stub(instance: manager)
+    manager.stub(installed_specs: [])
+  end
+
+  describe "#call" do
+    it "should update all plugins if none are specified" do
+      manager.should_receive(:update_plugins).with([]).once.and_return([])
+      app.should_receive(:call).with(env).once
+      subject.call(env)
+    end
+
+    it "should update specified plugins" do
+      manager.should_receive(:update_plugins).with(["foo"]).once.and_return([])
+      app.should_receive(:call).with(env).once
+
+      env[:plugin_name] = ["foo"]
+      subject.call(env)
+    end
+  end
+end