1 files changed, 111 insertions, 0 deletions
diff --git a/tests/support.py b/tests/support.py
new file mode 100644
index 00000000..8ac49669
--- /dev/null
+++ b/tests/support.py
@@ -0,0 +1,111 @@
+# code borrowed from python stdlib tests
+# I think we're not using it at the end... 
+# XXX Review and Remove
+
+import contextlib
+import socket
+import sys
+import unittest
+
+
+HOST = "localhost"
+
+
+class TestFailed(Exception):
+    """Test failed."""
+
+
+def bind_port(sock, host=HOST):
+    """Bind the socket to a free port and return the port number.  Relies on
+    ephemeral ports in order to ensure we are using an unbound port.  This is
+    important as many tests may be running simultaneously, especially in a
+    buildbot environment.  This method raises an exception if the sock.family
+    is AF_INET and sock.type is SOCK_STREAM, *and* the socket has SO_REUSEADDR
+    or SO_REUSEPORT set on it.  Tests should *never* set these socket options
+    for TCP/IP sockets.  The only case for setting these options is testing
+    multicasting via multiple UDP sockets.
+
+    Additionally, if the SO_EXCLUSIVEADDRUSE socket option is available (i.e.
+    on Windows), it will be set on the socket.  This will prevent anyone else
+    from bind()'ing to our host/port for the duration of the test.
+    """
+
+    if sock.family == socket.AF_INET and sock.type == socket.SOCK_STREAM:
+        if hasattr(socket, 'SO_REUSEADDR'):
+            if sock.getsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR) == 1:
+                raise TestFailed("tests should never set the SO_REUSEADDR "   \
+                                 "socket option on TCP/IP sockets!")
+        if hasattr(socket, 'SO_REUSEPORT'):
+            if sock.getsockopt(socket.SOL_SOCKET, socket.SO_REUSEPORT) == 1:
+                raise TestFailed("tests should never set the SO_REUSEPORT "   \
+                                 "socket option on TCP/IP sockets!")
+        if hasattr(socket, 'SO_EXCLUSIVEADDRUSE'):
+            sock.setsockopt(socket.SOL_SOCKET, socket.SO_EXCLUSIVEADDRUSE, 1)
+
+    sock.bind((host, 0))
+    port = sock.getsockname()[1]
+    return port
+
+
+def _run_suite(suite):
+    """Run tests from a unittest.TestSuite-derived class."""
+    runner = unittest.TextTestRunner(sys.stdout, verbosity=2,
+                                         failfast=False)
+    result = runner.run(suite)
+    if not result.wasSuccessful():
+        if len(result.errors) == 1 and not result.failures:
+            err = result.errors[0][1]
+        elif len(result.failures) == 1 and not result.errors:
+            err = result.failures[0][1]
+        else:
+            err = "multiple errors occurred"
+        raise TestFailed(err)
+
+
+def run_unittest(*classes):
+    """Run tests from unittest.TestCase-derived classes."""
+    valid_types = (unittest.TestSuite, unittest.TestCase)
+    suite = unittest.TestSuite()
+    for cls in classes:
+        if isinstance(cls, str):
+            if cls in sys.modules:
+                suite.addTest(unittest.findTestCases(sys.modules[cls]))
+            else:
+                raise ValueError("str arguments must be keys in sys.modules")
+        elif isinstance(cls, valid_types):
+            suite.addTest(cls)
+        else:
+            suite.addTest(unittest.makeSuite(cls))
+
+    _run_suite(suite)
+
+
+@contextlib.contextmanager
+def captured_output(stream_name):
+    """Return a context manager used by captured_stdout/stdin/stderr
+    that temporarily replaces the sys stream *stream_name* with a StringIO."""
+    import io
+    orig_stdout = getattr(sys, stream_name)
+    setattr(sys, stream_name, io.StringIO())
+    try:
+        yield getattr(sys, stream_name)
+    finally:
+        setattr(sys, stream_name, orig_stdout)
+
+
+def captured_stdout():
+    """Capture the output of sys.stdout:
+
+       with captured_stdout() as s:
+           print("hello")
+       self.assertEqual(s.getvalue(), "hello")
+    """
+    return captured_output("stdout")
+
+
+def captured_stderr():
+    return captured_output("stderr")
+
+
+def captured_stdin():
+    return captured_output("stdin")