From 6de3f1fb4e3160d0ab8f986ebe9287ce1a19aab0 Mon Sep 17 00:00:00 2001
From: Ilya Zayats <somebody32@gmail.com>
Date: Sat, 26 Feb 2011 07:49:50 +0300
Subject: [PATCH] added information about TEST_DIR env variable

---
 .../guides/source/contributing_to_ruby_on_rails.textile   | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/railties/guides/source/contributing_to_ruby_on_rails.textile b/railties/guides/source/contributing_to_ruby_on_rails.textile
index 1977f8d0ce..e00b26f948 100644
--- a/railties/guides/source/contributing_to_ruby_on_rails.textile
+++ b/railties/guides/source/contributing_to_ruby_on_rails.textile
@@ -101,6 +101,14 @@ $ cd actionpack
 $ rake test
 </shell>
 
+If you want to run tests from the specific directory use the +TEST_DIR+ environment variable. For example, this will run tests inside +railties/test/generators+ directory only:
+
+<shell>
+$ cd railties
+$ TEST_DIR=generators rake test
+</shell>
+
+
 h4. Warnings
 
 The test suite runs with warnings enabled. Ideally Ruby on Rails should issue no warning, but there may be a few, and also some from third-party libraries. Please ignore (or fix!) them if any, and submit patches that do not issue new warnings.