AdamT · August 29, 2015 14:18 · Dec 7, 2011 · Dec 7, 2011
diff --git a/diagnostic.rb b/diagnostic.rb
@@ -10,7 +10,7 @@ def call(env)
       return @app.call(env)
     rescue StandardError => e
       trace = e.backtrace.select{ |l|l.start_with?(Rails.root.to_s) }.join("\n    ")
-      msg = "\n#{e.class}\n#{e.message}\n#{trace}"
+      msg = "#{e.class}\n#{e.message}\n#{trace}\n"
       File.open(FILENAME, 'a') { |f| f.write msg }
       raise e
     end

diff --git a/application.rb b/application.rb
@@ -0,0 +1,8 @@
+module MyApp
+  class Application < Rails::Application
+    if Rails.env == 'test'
+      require 'diagnostic'
+      config.middleware.use(MyApp::DiagnosticMiddleware)
+    end
+  end
+end
diff --git a/diagnostic.rb b/diagnostic.rb
@@ -0,0 +1,18 @@
+module MyApp
+  class DiagnosticMiddleware
+    FILENAME = 'diagnostic.txt'
+
+    def initialize(app)
+      @app = app
+    end
+
+    def call(env)
+      return @app.call(env)
+    rescue StandardError => e
+      trace = e.backtrace.select{ |l|l.start_with?(Rails.root.to_s) }.join("\n    ")
+      msg = "\n#{e.class}\n#{e.message}\n#{trace}"
+      File.open(FILENAME, 'a') { |f| f.write msg }
+      raise e
+    end
+  end
+end
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