python-3.6.zip added from Github

README.cosmo contains the necessary links.

third_party/python/Lib/test/test_popen.py

@@ -0,0 +1,65 @@
+"""Basic tests for os.popen()
+
+  Particularly useful for platforms that fake popen.
+"""
+
+import unittest
+from test import support
+import os, sys
+
+# Test that command-lines get down as we expect.
+# To do this we execute:
+#    python -c "import sys;print(sys.argv)" {rest_of_commandline}
+# This results in Python being spawned and printing the sys.argv list.
+# We can then eval() the result of this, and see what each argv was.
+python = sys.executable
+if ' ' in python:
+    python = '"' + python + '"'     # quote embedded space for cmdline
+
+class PopenTest(unittest.TestCase):
+
+    def _do_test_commandline(self, cmdline, expected):
+        cmd = '%s -c "import sys; print(sys.argv)" %s'
+        cmd = cmd % (python, cmdline)
+        with os.popen(cmd) as p:
+            data = p.read()
+        got = eval(data)[1:] # strip off argv[0]
+        self.assertEqual(got, expected)
+
+    def test_popen(self):
+        self.assertRaises(TypeError, os.popen)
+        self._do_test_commandline(
+            "foo bar",
+            ["foo", "bar"]
+        )
+        self._do_test_commandline(
+            'foo "spam and eggs" "silly walk"',
+            ["foo", "spam and eggs", "silly walk"]
+        )
+        self._do_test_commandline(
+            'foo "a \\"quoted\\" arg" bar',
+            ["foo", 'a "quoted" arg', "bar"]
+        )
+        support.reap_children()
+
+    def test_return_code(self):
+        self.assertEqual(os.popen("exit 0").close(), None)
+        if os.name == 'nt':
+            self.assertEqual(os.popen("exit 42").close(), 42)
+        else:
+            self.assertEqual(os.popen("exit 42").close(), 42 << 8)
+
+    def test_contextmanager(self):
+        with os.popen("echo hello") as f:
+            self.assertEqual(f.read(), "hello\n")
+
+    def test_iterating(self):
+        with os.popen("echo hello") as f:
+            self.assertEqual(list(f), ["hello\n"])
+
+    def test_keywords(self):
+        with os.popen(cmd="exit 0", mode="w", buffering=-1):
+            pass
+
+if __name__ == "__main__":
+    unittest.main()