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diff --git a/spec/unit/chef_fs/path_util_spec.rb b/spec/unit/chef_fs/path_util_spec.rb
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+#
+# Author:: Kartik Null Cating-Subramanian (<ksubramanian@chef.io>)
+# Copyright:: Copyright (c) 2015 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/chef_fs/path_utils'
+
+describe Chef::ChefFS::PathUtils do
+  context 'invoking join' do
+    it 'joins well-behaved distinct path elements' do
+      expect(Chef::ChefFS::PathUtils.join('a', 'b', 'c')).to eq('a/b/c')
+    end
+
+    it 'strips extraneous slashes in the middle of paths' do
+      expect(Chef::ChefFS::PathUtils.join('a/', '/b', '/c/')).to eq('a/b/c')
+      expect(Chef::ChefFS::PathUtils.join('a/', '/b', '///c/')).to eq('a/b/c')
+    end
+
+    it 'preserves the whether the first element was absolute or not' do
+      expect(Chef::ChefFS::PathUtils.join('/a/', '/b', 'c/')).to eq('/a/b/c')
+      expect(Chef::ChefFS::PathUtils.join('///a/', '/b', 'c/')).to eq('/a/b/c')
+    end
+  end
+
+  context 'invoking is_absolute?' do
+    it 'confirms that paths starting with / are absolute' do
+      expect(Chef::ChefFS::PathUtils.is_absolute?('/foo/bar/baz')).to be true
+      expect(Chef::ChefFS::PathUtils.is_absolute?('/foo')).to be true
+    end
+
+    it 'confirms that paths starting with // are absolute even though that looks like some windows network path' do
+      expect(Chef::ChefFS::PathUtils.is_absolute?('//foo/bar/baz')).to be true
+    end
+
+    it 'confirms that root is indeed absolute' do
+      expect(Chef::ChefFS::PathUtils.is_absolute?('/')).to be true
+    end
+
+    it 'confirms that paths starting without / are relative' do
+      expect(Chef::ChefFS::PathUtils.is_absolute?('foo/bar/baz')).to be false
+      expect(Chef::ChefFS::PathUtils.is_absolute?('a')).to be false
+    end
+
+    it 'returns false for an empty path.' do
+      expect(Chef::ChefFS::PathUtils.is_absolute?('')).to be false
+    end
+  end
+
+  context 'invoking realest_path' do
+    let(:good_path) { File.dirname(__FILE__) }
+    let(:parent_path) { File.dirname(good_path) }
+
+    it 'handles paths with no wildcards or globs' do
+      expect(Chef::ChefFS::PathUtils.realest_path(good_path)).to eq(File.expand_path(good_path))
+    end
+
+    it 'handles paths with .. and .' do
+      expect(Chef::ChefFS::PathUtils.realest_path(good_path+'/../.')).to eq(File.expand_path(parent_path))
+    end
+
+    it 'handles paths with *' do
+      expect(Chef::ChefFS::PathUtils.realest_path(good_path + '/*/foo')).to eq(File.expand_path(good_path + '/*/foo'))
+    end
+
+    it 'handles directories that do not exist' do
+      expect(Chef::ChefFS::PathUtils.realest_path(good_path + '/something/or/other')).to eq(File.expand_path(good_path + '/something/or/other'))
+    end
+
+    it 'handles root correctly' do
+      if Chef::Platform.windows?
+        expect(Chef::ChefFS::PathUtils.realest_path('C:/')).to eq('C:/')
+      else
+        expect(Chef::ChefFS::PathUtils.realest_path('/')).to eq('/')
+      end
+    end
+  end
+
+  context 'invoking descendant_path' do
+    it 'handles paths with various casing on windows' do
+      allow(Chef::ChefFS).to receive(:windows?) { true }
+      expect(Chef::ChefFS::PathUtils.descendant_path('C:/ab/b/c', 'C:/AB/B')).to eq('c')
+      expect(Chef::ChefFS::PathUtils.descendant_path('C:/ab/b/c', 'c:/ab/B')).to eq('c')
+    end
+
+    it 'returns nil if the path does not have the given ancestor' do
+      expect(Chef::ChefFS::PathUtils.descendant_path('/D/E/F', '/A/B/C')).to be_nil
+      expect(Chef::ChefFS::PathUtils.descendant_path('/A/B/D', '/A/B/C')).to be_nil
+    end
+
+    it 'returns blank if the ancestor equals the path' do
+      expect(Chef::ChefFS::PathUtils.descendant_path('/A/B/D', '/A/B/D')).to eq('')
+    end
+  end
+end