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-rw-r--r--railties/lib/rails/test_unit/railtie.rb4
1 files changed, 4 insertions, 0 deletions
diff --git a/railties/lib/rails/test_unit/railtie.rb b/railties/lib/rails/test_unit/railtie.rb
index f52c4c44b7..ab1ebe1f8c 100644
--- a/railties/lib/rails/test_unit/railtie.rb
+++ b/railties/lib/rails/test_unit/railtie.rb
@@ -1,3 +1,7 @@
+if defined?(Rake) && Rake.application.top_level_tasks.grep(/^(default$|test(:|$))/).any?
+ ENV['RAILS_ENV'] ||= 'test'
+end
+
module Rails
class TestUnitRailtie < Rails::Railtie
config.app_generators do |c|