diff --git a/bin/translate_dependency_url b/bin/translate_dependency_url
index 9901904..0fd7431 100755
--- a/bin/translate_dependency_url
+++ b/bin/translate_dependency_url
@@ -1,19 +1,28 @@
 #!/usr/bin/env ruby
 
 $LOAD_PATH << File.expand_path('../../lib', __FILE__)
-require 'dependencies'
+require 'compile_extensions'
+require 'yaml'
 
 uri = ARGV[0]
 cache_path = File.join(`pwd`.chomp, 'dependencies')
 
-dependencies = Dependencies.new
+manifest = YAML.load_file('manifest.yml')
+dependencies = CompileExtensions::Dependencies.new(manifest)
+
+translated_uri = dependencies.find_translated_dependency(uri)
+
+if translated_uri.nil?
+  puts "DEPENDENCY_MISSING_IN_MANIFEST: #{uri}"
+  exit 1
+end
 
 if File.exist? cache_path
-  file_path = File.join(cache_path, dependencies.find_translated_dependency(uri).gsub(/[\/:]/, '_'))
+  file_path = File.join(cache_path, translated_uri.gsub(/[\/:]/, '_'))
 
   puts "file://#{file_path}"
 else
-  puts dependencies.find_translated_dependency(uri)
+  puts translated_uri
 end
 
 
diff --git a/lib/compile_extensions.rb b/lib/compile_extensions.rb
new file mode 100644
index 0000000..25edcb2
--- /dev/null
+++ b/lib/compile_extensions.rb
@@ -0,0 +1 @@
+require 'dependencies'
diff --git a/lib/dependencies.rb b/lib/dependencies.rb
index 5ed6257..e950835 100644
--- a/lib/dependencies.rb
+++ b/lib/dependencies.rb
@@ -1,21 +1,21 @@
-require 'yaml'
+module CompileExtensions
+  class Dependencies
+    def initialize(manifest)
+      @manifest = manifest
+    end
 
-class Dependencies
-  def find_matching_dependency(uri)
-    manifest = YAML.load_file('manifest.yml')
-    manifest['dependencies'].find do |dependency|
-      dependency['original'] == uri
+    def find_matching_dependency(uri)
+      @manifest['dependencies'].find do |dependency|
+        dependency['original'] == uri
+      end
     end
-  end
 
-  def find_translated_dependency(uri)
-    matching_dependency = find_matching_dependency(uri)
+    def find_translated_dependency(uri)
+      dependency = find_matching_dependency(uri)
 
-    if matching_dependency.nil?
-      puts "DEPENDENCY_MISSING_IN_MANIFEST: #{uri}"
-      exit 1
-    end
+      return nil if dependency.nil?
 
-    matching_dependency['xlated']
+      dependency['xlated']
+    end
   end
 end
diff --git a/spec/integration/translate_dependency_url_spec.rb b/spec/integration/translate_dependency_url_spec.rb
index f741c6f..4d6efa6 100644
--- a/spec/integration/translate_dependency_url_spec.rb
+++ b/spec/integration/translate_dependency_url_spec.rb
@@ -41,7 +41,8 @@ def run_translate
       end
 
       specify do
-        translated_url, _, _ = run_translate
+        translated_url, stderr, _ = run_translate
+        puts stderr
 
         expect(translated_url).to eq("file://#{buildpack_dir}/dependencies/https___another_location_a_file_elsewhere.zip\n")
       end
@@ -68,7 +69,6 @@ def run_translate
         expect(translated_url).to eq "DEPENDENCY_MISSING_IN_MANIFEST: #{original_url}\n"
         expect(status).not_to be_success
       end
-
     end
   end
 end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 1bcaab2..a1db453 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -1,2 +1,3 @@
 require 'rspec'
 require 'tmpdir'
+require 'compile_extensions'
diff --git a/spec/unit/compile_extensions/dependencies_spec.rb b/spec/unit/compile_extensions/dependencies_spec.rb
new file mode 100644
index 0000000..a3cd98e
--- /dev/null
+++ b/spec/unit/compile_extensions/dependencies_spec.rb
@@ -0,0 +1,66 @@
+require 'spec_helper'
+
+module CompileExtensions
+  describe Dependencies do
+
+    let(:manifest) {
+      {
+          'dependencies' => [
+              {
+                  'original' => 'https://google.com/backdoor',
+                  'xlated' => 'my_dog_has_fleas'
+              },
+              {
+                  'original' => 'https://google.com/frontdoor',
+                  'xlated' => 'i_do_not_like_green_eggs_and_ham'
+              }
+          ]
+      }
+    }
+
+    subject(:dependencies) { CompileExtensions::Dependencies.new(manifest) }
+
+    describe 'find matching dependency hash' do
+      let(:matching_dependency) { dependencies.find_matching_dependency(original_url) }
+
+      context 'a key that should match the first item' do
+        let(:original_url) { 'https://google.com/backdoor' }
+
+        specify do
+          expect(matching_dependency['original']).to eql('https://google.com/backdoor')
+          expect(matching_dependency['xlated']).to eql('my_dog_has_fleas')
+        end
+      end
+
+      context 'a key that should match another item' do
+        let(:original_url) { 'https://google.com/frontdoor' }
+
+        specify do
+          expect(matching_dependency['original']).to eql('https://google.com/frontdoor')
+          expect(matching_dependency['xlated']).to eql('i_do_not_like_green_eggs_and_ham')
+        end
+      end
+
+    end
+
+    describe 'find matching dependency translated url' do
+      let(:translated_url) { dependencies.find_translated_dependency(original_url) }
+
+      context 'a matching dependency' do
+        let(:original_url) { 'https://google.com/backdoor' }
+
+        specify do
+          expect(translated_url).to eql('my_dog_has_fleas')
+        end
+      end
+
+      context 'no matching dependency' do
+        let(:original_url) { 'https://notthere.com' }
+
+        specify do
+          expect(translated_url).to be_nil
+        end
+      end
+    end
+  end
+end