Use subprocess42 in recipe_engine to avoid threading madness.

recipe_engine/unittests/step_runner_test.py

Index: recipe_engine/unittests/step_runner_test.py
diff --git a/recipe_engine/unittests/step_runner_test.py b/recipe_engine/unittests/step_runner_test.py
new file mode 100755
index 0000000000000000000000000000000000000000..66c74de968ebfafd47d296edafe35e547a4d27da
--- /dev/null
+++ b/recipe_engine/unittests/step_runner_test.py
@@ -0,0 +1,62 @@
+#!/usr/bin/env python
+# Copyright 2013 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import os
+import shutil
+import sys
+import tempfile
+import unittest
+
+sys.path.append(os.path.dirname(os.path.dirname(os.path.dirname(
+    os.path.abspath(__file__)))))
+
+from recipe_engine import step_runner
+
+
+class TestLinebuf(unittest.TestCase):
+  def test_add_partial(self):
+    lb = step_runner._streamingLinebuf()
+    lb.ingest("blarf")
+    self.assertEqual([], lb.get_buffered())
+
+    self.assertEqual([], lb.buffedlines)
+    self.assertEqual("blarf", lb.extra.getvalue())
+
+  def test_add_whole(self):
+    lb = step_runner._streamingLinebuf()
+    lb.ingest("blarf\n")
+    self.assertEqual(["blarf"], lb.get_buffered())
+
+    self.assertEqual([], lb.buffedlines)
+    self.assertEqual("", lb.extra.getvalue())
+
+  def test_add_partial_whole(self):
+    lb = step_runner._streamingLinebuf()
+    lb.ingest("foof\nfleem\nblarf")
+    self.assertEqual(["foof", "fleem"], lb.get_buffered())
+
+    lb.ingest("dweeble\nwat")
+    self.assertEqual(["blarfdweeble"], lb.get_buffered())
+
+    self.assertEqual([], lb.buffedlines)
+    self.assertEqual("wat", lb.extra.getvalue())
+
+  def test_leftovers(self):
+    lb = step_runner._streamingLinebuf()
+
+    lb.ingest("nerds")
+    self.assertEqual([], lb.get_buffered())
+
+    lb.ingest("doop\n")
+    self.assertEqual(["nerdsdoop"], lb.get_buffered())
+
+    self.assertEqual([], lb.get_buffered())
+
+    self.assertEqual([], lb.buffedlines)
+    self.assertEqual("", lb.extra.getvalue())
+
+
+if __name__ == '__main__':
+  unittest.main()