From c0b107ff6975b3f181dd9e3d8dbcb1e900c3336d Mon Sep 17 00:00:00 2001
From: Seth Vargo <sethvargo@gmail.com>
Date: Thu, 23 Oct 2014 11:24:13 -0400
Subject: [PATCH] Add Registry#empty? to check if a registry has any items

---
 lib/vagrant/registry.rb            |  7 +++++++
 test/unit/vagrant/registry_test.rb | 11 +++++++++++
 2 files changed, 18 insertions(+)

diff --git a/lib/vagrant/registry.rb b/lib/vagrant/registry.rb
index 4e401777b..bb8521f74 100644
--- a/lib/vagrant/registry.rb
+++ b/lib/vagrant/registry.rb
@@ -59,6 +59,13 @@ module Vagrant
     end
     alias_method :size, :length
 
+    # Checks if this registry has any items.
+    #
+    # @return [Boolean]
+    def empty?
+      @items.keys.empty?
+    end
+
     # Merge one registry with another and return a completely new
     # registry. Note that the result cache is completely busted, so
     # any gets on the new registry will result in a cache miss.
diff --git a/test/unit/vagrant/registry_test.rb b/test/unit/vagrant/registry_test.rb
index 94364404c..12ccbec5c 100644
--- a/test/unit/vagrant/registry_test.rb
+++ b/test/unit/vagrant/registry_test.rb
@@ -116,6 +116,17 @@ describe Vagrant::Registry do
     end
   end
 
+  describe "#empty" do
+    it "should return true when the registry is empty" do
+      expect(instance.empty?).to be(true)
+    end
+
+    it "should return false when there is at least one element" do
+      instance.register("foo") { }
+      expect(instance.empty?).to be(false)
+    end
+  end
+
   describe "merging" do
     it "should merge in another registry" do
       one = described_class.new