     warn_test_pattern = project[:warn_test_pattern] || "*_test.ex"
 
     matched_test_files = Mix.Utils.extract_files(test_files, test_pattern)
-    matched_warn_test_files = 
+    matched_warn_test_files =
       Mix.Utils.extract_files(test_files, warn_test_pattern) -- matched_test_files
-    
+
     display_warn_test_pattern(matched_warn_test_files, test_pattern)
-    
+
     case matched_test_files do
       [] ->
         Mix.shell.error "Test patterns did not match any file: " <> Enum.join(files, ", ")

    end

    project = Mix.Project.config
    cover   = Keyword.merge(@cover, project[:test_coverage] || [])

    # Start cover after we load deps but before we start the app.
    cover =
      if opts[:cover] do
        cover[:tool].start(Mix.Project.compile_path(project), cover)
      end



    * `:test_pattern` - a pattern to load test files, defaults to `*_test.exs`.

    * `:warn_test_pattern` - a pattern to match potentially missed test files
      and display a warning, defaults to `*_test.ex`.

    * `:test_coverage` - a set of options to be passed down to the coverage
