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diff --git a/spec/unit/http/validate_content_length_spec.rb b/spec/unit/http/validate_content_length_spec.rb
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+++ b/spec/unit/http/validate_content_length_spec.rb
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+#
+# Author:: Serdar Sutay (<serdar@opscode.com>)
+# Copyright:: Copyright (c) 2014 Chef Software, 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 'stringio'
+
+describe Chef::HTTP::ValidateContentLength do
+  class TestClient < Chef::HTTP
+    use Chef::HTTP::ValidateContentLength
+  end
+
+  let(:method) { "GET" }
+  let(:url) { "http://dummy.com" }
+  let(:headers) { {} }
+  let(:data) { false }
+
+  let(:request) { }
+  let(:return_value) { "200" }
+
+  # Test Variables
+  let(:request_type) { :streaming }
+  let(:content_length_value) { 23 }
+  let(:streaming_length) { 23 }
+  let(:response_body) { "Thanks for checking in." }
+  let(:response_headers) {
+    {
+      "content-length" => content_length_value
+    }
+  }
+
+  let(:response) {
+    m = double('HttpResponse', :body => response_body)
+    m.stub(:[]) do |key|
+      response_headers[key]
+    end
+
+    m
+  }
+
+  let(:middleware) {
+    client = TestClient.new(url)
+    client.middlewares[0]
+  }
+
+  def run_content_length_validation
+    stream_handler = middleware.stream_response_handler(response)
+    middleware.handle_request(method, url, headers, data)
+
+    case request_type
+    when :streaming
+      # First stream the data
+      data_length = streaming_length
+      while data_length > 0
+        chunk_size = data_length > 10 ? 10 : data_length
+        stream_handler.handle_chunk(double("Chunk", :bytesize => chunk_size))
+        data_length -= chunk_size
+      end
+
+      # Finally call stream complete
+      middleware.handle_stream_complete(response, request, return_value)
+    when :direct
+      middleware.handle_response(response, request, return_value)
+    else
+      raise "Unknown request_type: #{request_type}"
+    end
+  end
+
+  let(:debug_stream) { StringIO.new }
+  let(:debug_output) { debug_stream.string }
+
+  before(:each) {
+    Chef::Log.level = :debug
+    Chef::Log.stub(:debug) do |message|
+      debug_stream.puts message
+    end
+  }
+
+  describe "without response body" do
+    let(:request_type) { :direct }
+    let(:response_body) { "Thanks for checking in." }
+
+    it "shouldn't raise error" do
+      lambda { run_content_length_validation }.should_not raise_error
+    end
+  end
+
+  describe "without Content-Length header" do
+    let(:response_headers) { { } }
+
+    [ "direct", "streaming" ].each do |req_type|
+      describe "when running #{req_type} request" do
+        let(:request_type) { req_type.to_sym }
+
+        it "should skip validation and log for debug" do
+          run_content_length_validation
+          debug_output.should include("HTTP server did not include a Content-Length header in response")
+        end
+      end
+    end
+  end
+
+  describe "with correct Content-Length header" do
+    [ "direct", "streaming" ].each do |req_type|
+      describe "when running #{req_type} request" do
+        let(:request_type) { req_type.to_sym }
+
+        it "should validate correctly" do
+          run_content_length_validation
+          debug_output.should include("Content-Length validated correctly.")
+        end
+      end
+    end
+  end
+
+  describe "with wrong Content-Length header" do
+    let(:content_length_value) { 25 }
+    [ "direct", "streaming" ].each do |req_type|
+      describe "when running #{req_type} request" do
+        let(:request_type) { req_type.to_sym }
+
+        it "should raise ContentLengthMismatch error" do
+          lambda { run_content_length_validation }.should raise_error(Chef::Exceptions::ContentLengthMismatch)
+        end
+      end
+    end
+  end
+
+  describe "when download is interrupted" do
+    let(:streaming_length) { 12 }
+
+    it "should raise ContentLengthMismatch error" do
+      lambda { run_content_length_validation }.should raise_error(Chef::Exceptions::ContentLengthMismatch)
+    end
+  end
+
+  describe "when Transfer-Encoding & Content-Length is set" do
+    let(:response_headers) {
+      {
+        "content-length" => content_length_value,
+        "transfer-encoding" => "chunked"
+      }
+    }
+
+    [ "direct", "streaming" ].each do |req_type|
+      describe "when running #{req_type} request" do
+        let(:request_type) { req_type.to_sym }
+
+        it "should skip validation and log for debug" do
+          run_content_length_validation
+          debug_output.should include("Transfer-Encoding header is set, skipping Content-Length check.")
+        end
+      end
+    end
+  end
+
+  describe "when client is being reused" do
+    before do
+      run_content_length_validation
+      debug_output.should include("Content-Length validated correctly.")
+    end
+
+    it "should reset internal counter" do
+        middleware.instance_variable_get(:@content_length_counter).should be_nil
+    end
+
+    it "should validate correctly second time" do
+      run_content_length_validation
+      debug_output.should include("Content-Length validated correctly.")
+    end
+  end
+
+end