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diff --git a/spec/unit/version_constraint_spec.rb b/spec/unit/version_constraint_spec.rb
new file mode 100644
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+++ b/spec/unit/version_constraint_spec.rb
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+#
+# Author:: Seth Falcon (<seth@opscode.com>)
+# Copyright:: Copyright 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'
+require 'chef/version_constraint'
+
+describe Chef::VersionConstraint do
+  describe "validation" do
+    bad_version = ["> >", ">= 1.2.z", "> 1.2.3 < 5.0", "> 1.2.3, < 5.0"]
+    bad_op = ["<3.0.1", ">$ 1.2.3", "! 3.4"]
+    o_error = Chef::Exceptions::InvalidVersionConstraint
+    v_error = Chef::Exceptions::InvalidCookbookVersion
+    bad_version.each do |s|
+      it "should raise #{v_error} when given #{s}" do
+        lambda { Chef::VersionConstraint.new s }.should raise_error(v_error)
+      end
+    end
+    bad_op.each do |s|
+      it "should raise #{o_error} when given #{s}" do
+        lambda { Chef::VersionConstraint.new s }.should raise_error(o_error)
+      end
+    end
+
+    it "should interpret a lone version number as implicit = OP" do
+      vc = Chef::VersionConstraint.new("1.2.3")
+      vc.to_s.should == "= 1.2.3"
+    end
+
+    it "should allow initialization with [] for back compatibility" do
+      Chef::VersionConstraint.new([]) == Chef::VersionConstraint.new
+    end
+
+    it "should allow initialization with ['1.2.3'] for back compatibility" do
+      Chef::VersionConstraint.new(["1.2"]) == Chef::VersionConstraint.new("1.2")
+    end
+
+  end
+
+  it "should default to >= 0.0.0" do
+    vc = Chef::VersionConstraint.new
+    vc.to_s.should == ">= 0.0.0"
+  end
+
+  it "should default to >= 0.0.0 when initialized with nil" do
+    Chef::VersionConstraint.new(nil).to_s.should == ">= 0.0.0"
+  end
+
+  describe "include?" do
+    describe "handles various input data types" do
+      before do
+        @vc = Chef::VersionConstraint.new "> 1.2.3"
+      end
+      it "String" do
+        @vc.should include "1.4"
+      end
+      it "Chef::Version" do
+        @vc.should include Chef::Version.new("1.4")
+      end
+      it "Chef::CookbookVersion" do
+        cv = Chef::CookbookVersion.new("alice")
+        cv.version = "1.4"
+        @vc.should include cv
+      end
+    end
+
+    it "strictly less than" do
+      vc = Chef::VersionConstraint.new "< 1.2.3"
+      vc.should_not include "1.3.0"
+      vc.should_not include "1.2.3"
+      vc.should include "1.2.2"
+    end
+
+    it "strictly greater than" do
+      vc = Chef::VersionConstraint.new "> 1.2.3"
+      vc.should include "1.3.0"
+      vc.should_not include "1.2.3"
+      vc.should_not include "1.2.2"
+    end
+
+    it "less than or equal to" do
+      vc = Chef::VersionConstraint.new "<= 1.2.3"
+      vc.should_not include "1.3.0"
+      vc.should include "1.2.3"
+      vc.should include "1.2.2"
+    end
+
+    it "greater than or equal to" do
+      vc = Chef::VersionConstraint.new ">= 1.2.3"
+      vc.should include "1.3.0"
+      vc.should include "1.2.3"
+      vc.should_not include "1.2.2"
+    end
+
+    it "equal to" do
+      vc = Chef::VersionConstraint.new "= 1.2.3"
+      vc.should_not include "1.3.0"
+      vc.should include "1.2.3"
+      vc.should_not include "0.3.0"
+    end
+
+    it "pessimistic ~> x.y.z" do
+      vc = Chef::VersionConstraint.new "~> 1.2.3"
+      vc.should include "1.2.3"
+      vc.should include "1.2.4"
+
+      vc.should_not include "1.2.2"
+      vc.should_not include "1.3.0"
+      vc.should_not include "2.0.0"
+    end
+
+    it "pessimistic ~> x.y" do
+      vc = Chef::VersionConstraint.new "~> 1.2"
+      vc.should include "1.3.3"
+      vc.should include "1.4"
+
+      vc.should_not include "2.2"
+      vc.should_not include "0.3.0"
+    end
+  end
+end