skwp · December 7, 2013 00:44 · Dec 7, 2013
diff --git a/dynamic_method_spec.rb b/dynamic_method_spec.rb
@@ -0,0 +1,8 @@
+require 'spec/support/grep_matcher'
+
+describe do
+  disallow_presence_of pattern: "send(.*#",
+    location: "app/",
+    description: "Do not use dynamic method invocations",
+    failure: "Please change dynamic method call to something more sane."
+end
diff --git a/grep_matcher.rb b/grep_matcher.rb
@@ -0,0 +1,17 @@
+# Soon to be open sourced as a gem
+module Reverb
+  module RSpec
+    module GrepMatcher
+      module ClassMethods
+        def disallow_presence_of(description:nil, pattern:nil, location:nil, failure:nil)
+          it(description) do
+            results = `grep -rn '#{pattern}' #{location}`
+            results.should eq(""), failure
+          end
+        end
+      end
+    end
+  end
+end
+
+RSpec::Core::ExampleGroup.extend(Reverb::RSpec::GrepMatcher::ClassMethods)