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diff --git a/chef-utils/spec/unit/mash_spec.rb b/chef-utils/spec/unit/mash_spec.rb
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+++ b/chef-utils/spec/unit/mash_spec.rb
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+#
+# Author:: Matthew Kent (<mkent@magoazul.com>)
+# Copyright:: Copyright 2011-2016, 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"
+
+RSpec.describe ChefUtils::Mash do
+  it "should duplicate a simple key/value mash to a new mash" do
+    data = { x: "one", y: "two", z: "three" }
+    @orig = ChefUtils::Mash.new(data)
+    @copy = @orig.dup
+    expect(@copy.to_hash).to eq(ChefUtils::Mash.new(data).to_hash)
+    @copy[:x] = "four"
+    expect(@orig[:x]).to eq("one")
+  end
+
+  it "should duplicate a mash with an array to a new mash" do
+    data = { x: "one", y: "two", z: [1, 2, 3] }
+    @orig = ChefUtils::Mash.new(data)
+    @copy = @orig.dup
+    expect(@copy.to_hash).to eq(ChefUtils::Mash.new(data).to_hash)
+    @copy[:z] << 4
+    expect(@orig[:z]).to eq([1, 2, 3])
+  end
+
+  it "should duplicate a nested mash to a new mash" do
+    data = { x: "one", y: "two", z: ChefUtils::Mash.new({ a: [1, 2, 3] }) }
+    @orig = ChefUtils::Mash.new(data)
+    @copy = @orig.dup
+    expect(@copy.to_hash).to eq(ChefUtils::Mash.new(data).to_hash)
+    @copy[:z][:a] << 4
+    expect(@orig[:z][:a]).to eq([1, 2, 3])
+  end
+
+  # add more!
+end