1 files changed, 40 insertions, 0 deletions
diff --git a/railties/lib/tasks/testing.rake b/railties/lib/tasks/testing.rake
new file mode 100644
index 0000000000..3542b74763
--- /dev/null
+++ b/railties/lib/tasks/testing.rake
@@ -0,0 +1,40 @@
+TEST_CHANGES_SINCE = Time.now - 600
+
+# Look up tests for recently modified sources.
+def recent_tests(source_pattern, test_path, touched_since = 10.minutes.ago)
+  FileList[source_pattern].map do |path|
+    if File.mtime(path) > touched_since
+      test = "#{test_path}/#{File.basename(path, '.rb')}_test.rb"
+      test if File.exists?(test)
+    end
+  end.compact
+end
+
+desc 'Test recent changes.'
+Rake::TestTask.new(:recent => [ :clone_structure_to_test ]) do |t|
+  since = TEST_CHANGES_SINCE
+  touched = FileList['test/**/*_test.rb'].select { |path| File.mtime(path) > since } +
+    recent_tests('app/models/*.rb', 'test/unit', since) +
+    recent_tests('app/controllers/*.rb', 'test/functional', since)
+
+  t.libs << 'test'
+  t.verbose = true
+  t.test_files = touched.uniq
+end
+task :test_recent => [ :clone_structure_to_test ]
+
+desc "Run the unit tests in test/unit"
+Rake::TestTask.new("test_units") { |t|
+  t.libs << "test"
+  t.pattern = 'test/unit/**/*_test.rb'
+  t.verbose = true
+}
+task :test_units => [ :clone_structure_to_test ]
+
+desc "Run the functional tests in test/functional"
+Rake::TestTask.new("test_functional") { |t|
+  t.libs << "test"
+  t.pattern = 'test/functional/**/*_test.rb'
+  t.verbose = true
+}
+task :test_functional => [ :clone_structure_to_test ]
+\ No newline at end of file