diff --git a/bin/test b/bin/test
index 3d5d2584..5da597c1 100755
--- a/bin/test
+++ b/bin/test
@@ -1,7 +1,5 @@
-#!/usr/bin/env ruby
+#!/bin/sh
+set -ex
 
-module_path = File.expand_path('../../node_modules/esprima', __FILE__)
-
-print `npm install esprima` unless File.directory?(module_path)
-
-print `script -q /dev/null bundle exec rake `
+docker build -t codeclimate/codeclimate-duplication .
+docker run codeclimate/codeclimate-duplication bundle exec rake
diff --git a/config/contents/duplicated_code.md b/config/contents/duplicated_code.md.erb
similarity index 77%
rename from config/contents/duplicated_code.md
rename to config/contents/duplicated_code.md.erb
index ac3e329d..1a6fe052 100644
--- a/config/contents/duplicated_code.md
+++ b/config/contents/duplicated_code.md.erb
@@ -1,4 +1,4 @@
-## Duplicated code
+## Duplicated Code
 
 Duplicated code can lead to software that is hard to understand and difficult to change. The Don't Repeat Yourself (DRY) principle states:
 
@@ -6,6 +6,11 @@ Duplicated code can lead to software that is hard to understand and difficult to
 
 When you violate DRY, bugs and maintenance problems are sure to follow. Duplicated code has a tendency to both continue to replicate and also to diverge (leaving bugs as two similar implementations differ in subtle ways).
 
+## Issue Mass
+
+Duplicated code has a calculated mass, which can be thought of as a measure of how much logic has been duplicated.
+This issue has a mass of `<%= issue.mass %>`: if you would like to change the minimum mass that will be reported as an issue, please see the details in [`codeclimate-duplication`'s documentation](https://github.com/codeclimate/codeclimate-duplication).
+
 ## Refactorings
 
 *   [Extract Method](http://sourcemaking.com/refactoring/extract-method)
diff --git a/lib/cc/engine/analyzers/violation.rb b/lib/cc/engine/analyzers/violation.rb
index b562550a..e064e841 100644
--- a/lib/cc/engine/analyzers/violation.rb
+++ b/lib/cc/engine/analyzers/violation.rb
@@ -1,3 +1,5 @@
+require "cc/engine/analyzers/sexp_lines"
+require "cc/engine/analyzers/violation_read_up"
 require "digest"
 
 module CC
@@ -80,14 +82,7 @@ def format_sexp(sexp)
         end
 
         def content_body
-          @_content_body ||= { "body": File.read(read_up_path) }
-        end
-
-        def read_up_path
-          relative_path = "../../../../config/contents/duplicated_code.md"
-          File.expand_path(
-            File.join(File.dirname(__FILE__), relative_path)
-          )
+          @_content_body ||= { "body": ViolationReadUp.new(issue).contents }
         end
 
         def fingerprint
diff --git a/lib/cc/engine/analyzers/violation_read_up.rb b/lib/cc/engine/analyzers/violation_read_up.rb
new file mode 100644
index 00000000..27d9367a
--- /dev/null
+++ b/lib/cc/engine/analyzers/violation_read_up.rb
@@ -0,0 +1,29 @@
+require "erb"
+
+module CC
+  module Engine
+    module Analyzers
+      class ViolationReadUp
+        def initialize(issue)
+          @issue = issue
+        end
+
+        def contents
+          ERB.new(File.read(template_path)).result(binding)
+        end
+
+        private
+
+        attr_reader :issue
+
+        TEMPLATE_REL_PATH = "../../../../config/contents/duplicated_code.md.erb"
+
+        def template_path
+          File.expand_path(
+            File.join(File.dirname(__FILE__), TEMPLATE_REL_PATH)
+          )
+        end
+      end
+    end
+  end
+end
diff --git a/lib/cc/engine/duplication.rb b/lib/cc/engine/duplication.rb
index 803b5e15..fcc339b5 100644
--- a/lib/cc/engine/duplication.rb
+++ b/lib/cc/engine/duplication.rb
@@ -6,7 +6,6 @@
 require 'cc/engine/analyzers/reporter'
 require 'cc/engine/analyzers/engine_config'
 require 'cc/engine/analyzers/sexp'
-require 'cc/engine/analyzers/sexp_lines'
 require 'flay'
 require 'json'
 
diff --git a/spec/cc/engine/analyzers/javascript/main_spec.rb b/spec/cc/engine/analyzers/javascript/main_spec.rb
index 5cb46b8a..ecd3bafc 100644
--- a/spec/cc/engine/analyzers/javascript/main_spec.rb
+++ b/spec/cc/engine/analyzers/javascript/main_spec.rb
@@ -41,7 +41,7 @@
         {"path" => "foo.js", "lines" => { "begin" => 2, "end" => 2} },
         {"path" => "foo.js", "lines" => { "begin" => 3, "end" => 3} }
       ])
-      expect(json["content"]).to eq({ "body" => read_up })
+      expect(json["content"]["body"]).to match /This issue has a mass of `99`/
       expect(json["fingerprint"]).to eq("55ae5d0990647ef496e9e0d315f9727d")
     end
   end
diff --git a/spec/cc/engine/analyzers/php/main_spec.rb b/spec/cc/engine/analyzers/php/main_spec.rb
index cbc3efd6..91b0e015 100644
--- a/spec/cc/engine/analyzers/php/main_spec.rb
+++ b/spec/cc/engine/analyzers/php/main_spec.rb
@@ -53,7 +53,7 @@
       expect(json["other_locations"]).to eq([
         {"path" => "foo.php", "lines" => { "begin" => 10, "end" => 14} },
       ])
-      expect(json["content"]).to eq({ "body" => read_up })
+      expect(json["content"]["body"]).to match /This issue has a mass of `44`/
       expect(json["fingerprint"]).to eq("667da0e2bab866aa2fe9d014a65d57d9")
     end
   end
diff --git a/spec/cc/engine/analyzers/python/main_spec.rb b/spec/cc/engine/analyzers/python/main_spec.rb
index 4c570594..a0f4366e 100644
--- a/spec/cc/engine/analyzers/python/main_spec.rb
+++ b/spec/cc/engine/analyzers/python/main_spec.rb
@@ -41,7 +41,7 @@
         {"path" => "foo.py", "lines" => { "begin" => 2, "end" => 2} },
         {"path" => "foo.py", "lines" => { "begin" => 3, "end" => 3} }
       ])
-      expect(json["content"]).to eq({ "body" => read_up })
+      expect(json["content"]["body"]).to match /This issue has a mass of `54`/
       expect(json["fingerprint"]).to eq("42b832387c997f54a2012efb2159aefc")
     end
   end
diff --git a/spec/cc/engine/analyzers/ruby/main_spec.rb b/spec/cc/engine/analyzers/ruby/main_spec.rb
index 863520cf..b1099f49 100644
--- a/spec/cc/engine/analyzers/ruby/main_spec.rb
+++ b/spec/cc/engine/analyzers/ruby/main_spec.rb
@@ -50,7 +50,7 @@
       expect(json["other_locations"]).to eq([
         {"path" => "foo.rb", "lines" => { "begin" => 9, "end" => 13} },
       ])
-      expect(json["content"]).to eq({ "body" => read_up })
+      expect(json["content"]["body"]).to match /This issue has a mass of `36`/
       expect(json["fingerprint"]).to eq("f21b75bbd135ec3ae6638364d5c73762")
     end
 
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index 8704c4a2..a090d825 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -14,6 +14,4 @@
 
   config.order = :random
   config.disable_monkey_patching!
-
-  config.include ReadUpHelpers
 end
diff --git a/spec/support/helpers/read_up_helpers.rb b/spec/support/helpers/read_up_helpers.rb
deleted file mode 100644
index c6a90821..00000000
--- a/spec/support/helpers/read_up_helpers.rb
+++ /dev/null
@@ -1,12 +0,0 @@
-module ReadUpHelpers
-  def read_up
-    File.read(read_up_path)
-  end
-
-  def read_up_path
-    relative_path = "../../../config/contents/duplicated_code.md"
-    File.expand_path(
-      File.join(File.dirname(__FILE__), relative_path)
-    )
-  end
-end