diff --git a/test/unit/vagrant/plugin/v1/manager_test.rb b/test/unit/vagrant/plugin/v1/manager_test.rb
index a58e1b0fe..f4b38d608 100644
--- a/test/unit/vagrant/plugin/v1/manager_test.rb
+++ b/test/unit/vagrant/plugin/v1/manager_test.rb
@@ -11,14 +11,88 @@ describe Vagrant::Plugin::V1::Manager do
     p
   end
 
+  it "should enumerate registered communicator classes" do
+    pA = plugin do |p|
+      p.communicator("foo") { "bar" }
+    end
+
+    pB = plugin do |p|
+      p.communicator("bar") { "baz" }
+    end
+
+    instance.register(pA)
+    instance.register(pB)
+
+    instance.communicators.length.should == 2
+    instance.communicators[:foo].should == "bar"
+    instance.communicators[:bar].should == "baz"
+  end
+
   it "should enumerate registered configuration classes" do
     pA = plugin do |p|
       p.config("foo") { "bar" }
     end
 
-    instance.register(pA)
+    pB = plugin do |p|
+      p.config("bar") { "baz" }
+    end
 
-    instance.config.length.should == 1
+    instance.register(pA)
+    instance.register(pB)
+
+    instance.config.length.should == 2
     instance.config[:foo].should == "bar"
+    instance.config[:bar].should == "baz"
+  end
+
+  it "should enumerate registered guest classes" do
+    pA = plugin do |p|
+      p.guest("foo") { "bar" }
+    end
+
+    pB = plugin do |p|
+      p.guest("bar") { "baz" }
+    end
+
+    instance.register(pA)
+    instance.register(pB)
+
+    instance.guests.length.should == 2
+    instance.guests[:foo].should == "bar"
+    instance.guests[:bar].should == "baz"
+  end
+
+  it "should enumerate registered host classes" do
+    pA = plugin do |p|
+      p.host("foo") { "bar" }
+    end
+
+    pB = plugin do |p|
+      p.host("bar") { "baz" }
+    end
+
+    instance.register(pA)
+    instance.register(pB)
+
+    instance.hosts.length.should == 2
+    instance.hosts[:foo].should == "bar"
+    instance.hosts[:bar].should == "baz"
+  end
+
+  it "should enumerate registered provider classes" do
+    pA = plugin do |p|
+      p.provider("foo") { "bar" }
+    end
+
+    pB = plugin do |p|
+      p.provider("bar") { "baz" }
+    end
+
+    instance.register(pA)
+    instance.register(pB)
+
+    instance.providers.length.should == 2
+    instance.providers[:foo].should == "bar"
+    instance.providers[:bar].should == "baz"
   end
 end