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diff --git a/spec/unit/run_list/run_list_expansion_spec.rb b/spec/unit/run_list/run_list_expansion_spec.rb
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+++ b/spec/unit/run_list/run_list_expansion_spec.rb
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+#
+# Author:: Daniel DeLeo (<dan@opscode.com>)
+# Copyright:: Copyright (c) 2010 Opscode, Inc.
+# License:: Apache License, Version 2.0
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+require 'spec_helper'
+
+describe Chef::RunList::RunListExpansion do
+  before do
+    @run_list = Chef::RunList.new
+    @run_list << 'recipe[lobster]' << 'role[rage]' << 'recipe[fist]'
+    @expansion = Chef::RunList::RunListExpansion.new("_default", @run_list.run_list_items)
+  end
+
+  describe "before expanding the run list" do
+    it "has an array of run list items" do
+      @expansion.run_list_items.should == @run_list.run_list_items
+    end
+
+    it "has default_attrs" do
+      @expansion.default_attrs.should == Mash.new
+    end
+
+    it "has override attrs" do
+      @expansion.override_attrs.should == Mash.new
+    end
+
+    it "it has an empty list of recipes" do
+      @expansion.should have(0).recipes
+    end
+
+    it "has not applied its roles" do
+      @expansion.applied_role?('rage').should be_false
+    end
+  end
+
+  describe "after applying a role with environment-specific run lists" do
+    before do
+      @rage_role = Chef::Role.new.tap do |r|
+        r.name("rage")
+        r.env_run_lists('_default' => [], "prod" => ["recipe[prod-only]"])
+      end
+      @expansion = Chef::RunList::RunListExpansion.new("prod", @run_list.run_list_items)
+      @expansion.should_receive(:fetch_role).and_return(@rage_role)
+      @expansion.expand
+    end
+
+    it "has the correct list of recipes for the given environment" do
+      @expansion.recipes.should == ["lobster", "prod-only", "fist"]
+    end
+
+  end
+
+  describe "after applying a role" do
+    before do
+      @expansion.stub!(:fetch_role).and_return(Chef::Role.new)
+      @expansion.inflate_role('rage', "role[base]")
+    end
+
+    it "tracks the applied role" do
+      @expansion.applied_role?('rage').should be_true
+    end
+
+    it "does not inflate the role again" do
+      @expansion.inflate_role('rage', "role[base]").should be_false
+    end
+  end
+
+  describe "after expanding a run list" do
+    before do
+      @first_role = Chef::Role.new
+      @first_role.run_list('role[mollusk]')
+      @first_role.default_attributes({'foo' => 'bar'})
+      @first_role.override_attributes({'baz' => 'qux'})
+      @second_role = Chef::Role.new
+      @second_role.run_list('recipe[crabrevenge]')
+      @second_role.default_attributes({'foo' => 'boo'})
+      @second_role.override_attributes({'baz' => 'bux'})
+      @expansion.stub!(:fetch_role).and_return(@first_role, @second_role)
+      @expansion.expand
+    end
+
+    it "has the ordered list of recipes" do
+      @expansion.recipes.should == ['lobster', 'crabrevenge', 'fist']
+    end
+
+    it "has the merged attributes from the roles with outer roles overridding inner" do
+      @expansion.default_attrs.should == {'foo' => 'bar'}
+      @expansion.override_attrs.should == {'baz' => 'qux'}
+    end
+
+    it "has the list of all roles applied" do
+      # this is the correct order, but 1.8 hash order is not stable
+      @expansion.roles.should =~ ['rage', 'mollusk']
+    end
+
+  end
+
+  describe "after expanding a run list with a non existant role" do
+    before do
+      @expansion.stub!(:fetch_role) { @expansion.role_not_found('crabrevenge', "role[base]") }
+      @expansion.expand
+    end
+
+    it "is invalid" do
+      @expansion.should be_invalid
+      @expansion.errors?.should be_true # aliases
+    end
+
+    it "has a list of invalid role names" do
+      @expansion.errors.should include('crabrevenge')
+    end
+
+  end
+
+end