Add support for running a single file.

lib/test_inline/tasks/test_inline.rake

@@ -2,10 +2,19 @@
 namespace :test do
   namespace :inline do
 
+    desc "Run the tests on a specific file"
+    task :file => :environment do
+      if Rails.env.test?
+        setup_and_run ENV['FILE']
+      else
+        system "rake test:inline:file RAILS_ENV=test FILE=#{ENV['FILE']}"
+      end
+    end
+
     desc "Run inline tests in app/models, app/helpers and lib"
     task :units => :environment do
       if Rails.env.test?
-        setup_and_run Test::Inline::Railtie.unit_paths
+        setup_and_run *Test::Inline::Railtie.unit_paths
       else
         system "rake test:inline:units RAILS_ENV=test"
       end
@@ -14,7 +23,7 @@ namespace :test do
     desc "Run inline tests in app/controllers"
     task :functionals => :environment do
       if Rails.env.test?
-        setup_and_run Test::Inline::Railtie.functional_paths
+        setup_and_run *Test::Inline::Railtie.functional_paths
       else
         system "rake test:inline:functionals RAILS_ENV=test"
       end
@@ -25,13 +34,17 @@ namespace :test do
 
   private
 
-  def setup_and_run(paths)
+  def setup_and_run(*paths)
     require Rails.root.join('test/test_helper')
     paths.collect! {|p| Rails.root.join p}
     Test::Inline.setup *paths
     paths.each do |p|
-      Dir["#{p}/**/*.rb"].each do |f|
-        require File.expand_path(f)
+      if p.directory?
+        Dir["#{p}/**/*.rb"].each do |f|
+          require File.expand_path(f)
+        end
+      else
+        require File.expand_path(p)
       end
     end
   end