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-rw-r--r--railties/guides/source/contributing_to_ruby_on_rails.textile8
1 files changed, 8 insertions, 0 deletions
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.