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Python Source  |  2005-10-18  |  22.1 KB  |  564 lines
  1. import unittest
  2. from test import test_support
  3. import subprocess
  4. import sys
  5. import signal
  6. import os
  7. import tempfile
  8. import time
  9. import re
  10.  
  11. mswindows = (sys.platform == "win32")
  12.  
  13. #
  14. # Depends on the following external programs: Python
  15. #
  16.  
  17. if mswindows:
  18.     SETBINARY = ('import msvcrt; msvcrt.setmode(sys.stdout.fileno(), '
  19.                                                 'os.O_BINARY);')
  20. else:
  21.     SETBINARY = ''
  22.  
  23. # In a debug build, stuff like "[6580 refs]" is printed to stderr at
  24. # shutdown time.  That frustrates tests trying to check stderr produced
  25. # from a spawned Python process.
  26. def remove_stderr_debug_decorations(stderr):
  27.     return re.sub(r"\[\d+ refs\]\r?\n?$", "", stderr)
  28.  
  29. class ProcessTestCase(unittest.TestCase):
  30.     def mkstemp(self):
  31.         """wrapper for mkstemp, calling mktemp if mkstemp is not available"""
  32.         if hasattr(tempfile, "mkstemp"):
  33.             return tempfile.mkstemp()
  34.         else:
  35.             fname = tempfile.mktemp()
  36.             return os.open(fname, os.O_RDWR|os.O_CREAT), fname
  37.  
  38.     #
  39.     # Generic tests
  40.     #
  41.     def test_call_seq(self):
  42.         # call() function with sequence argument
  43.         rc = subprocess.call([sys.executable, "-c",
  44.                               "import sys; sys.exit(47)"])
  45.         self.assertEqual(rc, 47)
  46.  
  47.     def test_call_kwargs(self):
  48.         # call() function with keyword args
  49.         newenv = os.environ.copy()
  50.         newenv["FRUIT"] = "banana"
  51.         rc = subprocess.call([sys.executable, "-c",
  52.                           'import sys, os;' \
  53.                           'sys.exit(os.getenv("FRUIT")=="banana")'],
  54.                         env=newenv)
  55.         self.assertEqual(rc, 1)
  56.  
  57.     def test_stdin_none(self):
  58.         # .stdin is None when not redirected
  59.         p = subprocess.Popen([sys.executable, "-c", 'print "banana"'],
  60.                          stdout=subprocess.PIPE, stderr=subprocess.PIPE)
  61.         p.wait()
  62.         self.assertEqual(p.stdin, None)
  63.  
  64.     def test_stdout_none(self):
  65.         # .stdout is None when not redirected
  66.         p = subprocess.Popen([sys.executable, "-c",
  67.                              'print "    this bit of output is from a '
  68.                              'test of stdout in a different '
  69.                              'process ..."'],
  70.                              stdin=subprocess.PIPE, stderr=subprocess.PIPE)
  71.         p.wait()
  72.         self.assertEqual(p.stdout, None)
  73.  
  74.     def test_stderr_none(self):
  75.         # .stderr is None when not redirected
  76.         p = subprocess.Popen([sys.executable, "-c", 'print "banana"'],
  77.                          stdin=subprocess.PIPE, stdout=subprocess.PIPE)
  78.         p.wait()
  79.         self.assertEqual(p.stderr, None)
  80.  
  81.     def test_executable(self):
  82.         p = subprocess.Popen(["somethingyoudonthave",
  83.                               "-c", "import sys; sys.exit(47)"],
  84.                              executable=sys.executable)
  85.         p.wait()
  86.         self.assertEqual(p.returncode, 47)
  87.  
  88.     def test_stdin_pipe(self):
  89.         # stdin redirection
  90.         p = subprocess.Popen([sys.executable, "-c",
  91.                          'import sys; sys.exit(sys.stdin.read() == "pear")'],
  92.                         stdin=subprocess.PIPE)
  93.         p.stdin.write("pear")
  94.         p.stdin.close()
  95.         p.wait()
  96.         self.assertEqual(p.returncode, 1)
  97.  
  98.     def test_stdin_filedes(self):
  99.         # stdin is set to open file descriptor
  100.         tf = tempfile.TemporaryFile()
  101.         d = tf.fileno()
  102.         os.write(d, "pear")
  103.         os.lseek(d, 0, 0)
  104.         p = subprocess.Popen([sys.executable, "-c",
  105.                          'import sys; sys.exit(sys.stdin.read() == "pear")'],
  106.                          stdin=d)
  107.         p.wait()
  108.         self.assertEqual(p.returncode, 1)
  109.  
  110.     def test_stdin_fileobj(self):
  111.         # stdin is set to open file object
  112.         tf = tempfile.TemporaryFile()
  113.         tf.write("pear")
  114.         tf.seek(0)
  115.         p = subprocess.Popen([sys.executable, "-c",
  116.                          'import sys; sys.exit(sys.stdin.read() == "pear")'],
  117.                          stdin=tf)
  118.         p.wait()
  119.         self.assertEqual(p.returncode, 1)
  120.  
  121.     def test_stdout_pipe(self):
  122.         # stdout redirection
  123.         p = subprocess.Popen([sys.executable, "-c",
  124.                           'import sys; sys.stdout.write("orange")'],
  125.                          stdout=subprocess.PIPE)
  126.         self.assertEqual(p.stdout.read(), "orange")
  127.  
  128.     def test_stdout_filedes(self):
  129.         # stdout is set to open file descriptor
  130.         tf = tempfile.TemporaryFile()
  131.         d = tf.fileno()
  132.         p = subprocess.Popen([sys.executable, "-c",
  133.                           'import sys; sys.stdout.write("orange")'],
  134.                          stdout=d)
  135.         p.wait()
  136.         os.lseek(d, 0, 0)
  137.         self.assertEqual(os.read(d, 1024), "orange")
  138.  
  139.     def test_stdout_fileobj(self):
  140.         # stdout is set to open file object
  141.         tf = tempfile.TemporaryFile()
  142.         p = subprocess.Popen([sys.executable, "-c",
  143.                           'import sys; sys.stdout.write("orange")'],
  144.                          stdout=tf)
  145.         p.wait()
  146.         tf.seek(0)
  147.         self.assertEqual(tf.read(), "orange")
  148.  
  149.     def test_stderr_pipe(self):
  150.         # stderr redirection
  151.         p = subprocess.Popen([sys.executable, "-c",
  152.                           'import sys; sys.stderr.write("strawberry")'],
  153.                          stderr=subprocess.PIPE)
  154.         self.assertEqual(remove_stderr_debug_decorations(p.stderr.read()),
  155.                          "strawberry")
  156.  
  157.     def test_stderr_filedes(self):
  158.         # stderr is set to open file descriptor
  159.         tf = tempfile.TemporaryFile()
  160.         d = tf.fileno()
  161.         p = subprocess.Popen([sys.executable, "-c",
  162.                           'import sys; sys.stderr.write("strawberry")'],
  163.                          stderr=d)
  164.         p.wait()
  165.         os.lseek(d, 0, 0)
  166.         self.assertEqual(remove_stderr_debug_decorations(os.read(d, 1024)),
  167.                          "strawberry")
  168.  
  169.     def test_stderr_fileobj(self):
  170.         # stderr is set to open file object
  171.         tf = tempfile.TemporaryFile()
  172.         p = subprocess.Popen([sys.executable, "-c",
  173.                           'import sys; sys.stderr.write("strawberry")'],
  174.                          stderr=tf)
  175.         p.wait()
  176.         tf.seek(0)
  177.         self.assertEqual(remove_stderr_debug_decorations(tf.read()),
  178.                          "strawberry")
  179.  
  180.     def test_stdout_stderr_pipe(self):
  181.         # capture stdout and stderr to the same pipe
  182.         p = subprocess.Popen([sys.executable, "-c",
  183.                           'import sys;' \
  184.                           'sys.stdout.write("apple");' \
  185.                           'sys.stdout.flush();' \
  186.                           'sys.stderr.write("orange")'],
  187.                          stdout=subprocess.PIPE,
  188.                          stderr=subprocess.STDOUT)
  189.         output = p.stdout.read()
  190.         stripped = remove_stderr_debug_decorations(output)
  191.         self.assertEqual(stripped, "appleorange")
  192.  
  193.     def test_stdout_stderr_file(self):
  194.         # capture stdout and stderr to the same open file
  195.         tf = tempfile.TemporaryFile()
  196.         p = subprocess.Popen([sys.executable, "-c",
  197.                           'import sys;' \
  198.                           'sys.stdout.write("apple");' \
  199.                           'sys.stdout.flush();' \
  200.                           'sys.stderr.write("orange")'],
  201.                          stdout=tf,
  202.                          stderr=tf)
  203.         p.wait()
  204.         tf.seek(0)
  205.         output = tf.read()
  206.         stripped = remove_stderr_debug_decorations(output)
  207.         self.assertEqual(stripped, "appleorange")
  208.  
  209.     def test_cwd(self):
  210.         tmpdir = os.getenv("TEMP", "/tmp")
  211.         # We cannot use os.path.realpath to canonicalize the path,
  212.         # since it doesn't expand Tru64 {memb} strings. See bug 1063571.
  213.         cwd = os.getcwd()
  214.         os.chdir(tmpdir)
  215.         tmpdir = os.getcwd()
  216.         os.chdir(cwd)
  217.         p = subprocess.Popen([sys.executable, "-c",
  218.                           'import sys,os;' \
  219.                           'sys.stdout.write(os.getcwd())'],
  220.                          stdout=subprocess.PIPE,
  221.                          cwd=tmpdir)
  222.         normcase = os.path.normcase
  223.         self.assertEqual(normcase(p.stdout.read()), normcase(tmpdir))
  224.  
  225.     def test_env(self):
  226.         newenv = os.environ.copy()
  227.         newenv["FRUIT"] = "orange"
  228.         p = subprocess.Popen([sys.executable, "-c",
  229.                           'import sys,os;' \
  230.                           'sys.stdout.write(os.getenv("FRUIT"))'],
  231.                          stdout=subprocess.PIPE,
  232.                          env=newenv)
  233.         self.assertEqual(p.stdout.read(), "orange")
  234.  
  235.     def test_communicate(self):
  236.         p = subprocess.Popen([sys.executable, "-c",
  237.                           'import sys,os;' \
  238.                           'sys.stderr.write("pineapple");' \
  239.                           'sys.stdout.write(sys.stdin.read())'],
  240.                          stdin=subprocess.PIPE,
  241.                          stdout=subprocess.PIPE,
  242.                          stderr=subprocess.PIPE)
  243.         (stdout, stderr) = p.communicate("banana")
  244.         self.assertEqual(stdout, "banana")
  245.         self.assertEqual(remove_stderr_debug_decorations(stderr),
  246.                          "pineapple")
  247.  
  248.     def test_communicate_returns(self):
  249.         # communicate() should return None if no redirection is active
  250.         p = subprocess.Popen([sys.executable, "-c",
  251.                               "import sys; sys.exit(47)"])
  252.         (stdout, stderr) = p.communicate()
  253.         self.assertEqual(stdout, None)
  254.         self.assertEqual(stderr, None)
  255.  
  256.     def test_communicate_pipe_buf(self):
  257.         # communicate() with writes larger than pipe_buf
  258.         # This test will probably deadlock rather than fail, if
  259.         # communicate() does not work properly.
  260.         x, y = os.pipe()
  261.         if mswindows:
  262.             pipe_buf = 512
  263.         else:
  264.             pipe_buf = os.fpathconf(x, "PC_PIPE_BUF")
  265.         os.close(x)
  266.         os.close(y)
  267.         p = subprocess.Popen([sys.executable, "-c",
  268.                           'import sys,os;'
  269.                           'sys.stdout.write(sys.stdin.read(47));' \
  270.                           'sys.stderr.write("xyz"*%d);' \
  271.                           'sys.stdout.write(sys.stdin.read())' % pipe_buf],
  272.                          stdin=subprocess.PIPE,
  273.                          stdout=subprocess.PIPE,
  274.                          stderr=subprocess.PIPE)
  275.         string_to_write = "abc"*pipe_buf
  276.         (stdout, stderr) = p.communicate(string_to_write)
  277.         self.assertEqual(stdout, string_to_write)
  278.  
  279.     def test_writes_before_communicate(self):
  280.         # stdin.write before communicate()
  281.         p = subprocess.Popen([sys.executable, "-c",
  282.                           'import sys,os;' \
  283.                           'sys.stdout.write(sys.stdin.read())'],
  284.                          stdin=subprocess.PIPE,
  285.                          stdout=subprocess.PIPE,
  286.                          stderr=subprocess.PIPE)
  287.         p.stdin.write("banana")
  288.         (stdout, stderr) = p.communicate("split")
  289.         self.assertEqual(stdout, "bananasplit")
  290.         self.assertEqual(remove_stderr_debug_decorations(stderr), "")
  291.  
  292.     def test_universal_newlines(self):
  293.         p = subprocess.Popen([sys.executable, "-c",
  294.                           'import sys,os;' + SETBINARY +
  295.                           'sys.stdout.write("line1\\n");'
  296.                           'sys.stdout.flush();'
  297.                           'sys.stdout.write("line2\\r");'
  298.                           'sys.stdout.flush();'
  299.                           'sys.stdout.write("line3\\r\\n");'
  300.                           'sys.stdout.flush();'
  301.                           'sys.stdout.write("line4\\r");'
  302.                           'sys.stdout.flush();'
  303.                           'sys.stdout.write("\\nline5");'
  304.                           'sys.stdout.flush();'
  305.                           'sys.stdout.write("\\nline6");'],
  306.                          stdout=subprocess.PIPE,
  307.                          universal_newlines=1)
  308.         stdout = p.stdout.read()
  309.         if hasattr(open, 'newlines'):
  310.             # Interpreter with universal newline support
  311.             self.assertEqual(stdout,
  312.                              "line1\nline2\nline3\nline4\nline5\nline6")
  313.         else:
  314.             # Interpreter without universal newline support
  315.             self.assertEqual(stdout,
  316.                              "line1\nline2\rline3\r\nline4\r\nline5\nline6")
  317.  
  318.     def test_universal_newlines_communicate(self):
  319.         # universal newlines through communicate()
  320.         p = subprocess.Popen([sys.executable, "-c",
  321.                           'import sys,os;' + SETBINARY +
  322.                           'sys.stdout.write("line1\\n");'
  323.                           'sys.stdout.flush();'
  324.                           'sys.stdout.write("line2\\r");'
  325.                           'sys.stdout.flush();'
  326.                           'sys.stdout.write("line3\\r\\n");'
  327.                           'sys.stdout.flush();'
  328.                           'sys.stdout.write("line4\\r");'
  329.                           'sys.stdout.flush();'
  330.                           'sys.stdout.write("\\nline5");'
  331.                           'sys.stdout.flush();'
  332.                           'sys.stdout.write("\\nline6");'],
  333.                          stdout=subprocess.PIPE, stderr=subprocess.PIPE,
  334.                          universal_newlines=1)
  335.         (stdout, stderr) = p.communicate()
  336.         if hasattr(open, 'newlines'):
  337.             # Interpreter with universal newline support
  338.             self.assertEqual(stdout,
  339.                              "line1\nline2\nline3\nline4\nline5\nline6")
  340.         else:
  341.             # Interpreter without universal newline support
  342.             self.assertEqual(stdout, "line1\nline2\rline3\r\nline4\r\nline5\nline6")
  343.  
  344.     def test_no_leaking(self):
  345.         # Make sure we leak no resources
  346.         if test_support.is_resource_enabled("subprocess") and not mswindows:
  347.             max_handles = 1026 # too much for most UNIX systems
  348.         else:
  349.             max_handles = 65
  350.         for i in range(max_handles):
  351.             p = subprocess.Popen([sys.executable, "-c",
  352.                     "import sys;sys.stdout.write(sys.stdin.read())"],
  353.                     stdin=subprocess.PIPE,
  354.                     stdout=subprocess.PIPE,
  355.                     stderr=subprocess.PIPE)
  356.             data = p.communicate("lime")[0]
  357.             self.assertEqual(data, "lime")
  358.  
  359.  
  360.     def test_list2cmdline(self):
  361.         self.assertEqual(subprocess.list2cmdline(['a b c', 'd', 'e']),
  362.                          '"a b c" d e')
  363.         self.assertEqual(subprocess.list2cmdline(['ab"c', '\\', 'd']),
  364.                          'ab\\"c \\ d')
  365.         self.assertEqual(subprocess.list2cmdline(['a\\\\\\b', 'de fg', 'h']),
  366.                          'a\\\\\\b "de fg" h')
  367.         self.assertEqual(subprocess.list2cmdline(['a\\"b', 'c', 'd']),
  368.                          'a\\\\\\"b c d')
  369.         self.assertEqual(subprocess.list2cmdline(['a\\\\b c', 'd', 'e']),
  370.                          '"a\\\\b c" d e')
  371.         self.assertEqual(subprocess.list2cmdline(['a\\\\b\\ c', 'd', 'e']),
  372.                          '"a\\\\b\\ c" d e')
  373.  
  374.  
  375.     def test_poll(self):
  376.         p = subprocess.Popen([sys.executable,
  377.                           "-c", "import time; time.sleep(1)"])
  378.         count = 0
  379.         while p.poll() is None:
  380.             time.sleep(0.1)
  381.             count += 1
  382.         # We expect that the poll loop probably went around about 10 times,
  383.         # but, based on system scheduling we can't control, it's possible
  384.         # poll() never returned None.  It "should be" very rare that it
  385.         # didn't go around at least twice.
  386.         self.assert_(count >= 2)
  387.         # Subsequent invocations should just return the returncode
  388.         self.assertEqual(p.poll(), 0)
  389.  
  390.  
  391.     def test_wait(self):
  392.         p = subprocess.Popen([sys.executable,
  393.                           "-c", "import time; time.sleep(2)"])
  394.         self.assertEqual(p.wait(), 0)
  395.         # Subsequent invocations should just return the returncode
  396.         self.assertEqual(p.wait(), 0)
  397.  
  398.  
  399.     def test_invalid_bufsize(self):
  400.         # an invalid type of the bufsize argument should raise
  401.         # TypeError.
  402.         try:
  403.             subprocess.Popen([sys.executable, "-c", "pass"], "orange")
  404.         except TypeError:
  405.             pass
  406.         else:
  407.             self.fail("Expected TypeError")
  408.  
  409.     #
  410.     # POSIX tests
  411.     #
  412.     if not mswindows:
  413.         def test_exceptions(self):
  414.             # catched & re-raised exceptions
  415.             try:
  416.                 p = subprocess.Popen([sys.executable, "-c", ""],
  417.                                  cwd="/this/path/does/not/exist")
  418.             except OSError, e:
  419.                 # The attribute child_traceback should contain "os.chdir"
  420.                 # somewhere.
  421.                 self.assertNotEqual(e.child_traceback.find("os.chdir"), -1)
  422.             else:
  423.                 self.fail("Expected OSError")
  424.  
  425.         def test_run_abort(self):
  426.             # returncode handles signal termination
  427.             p = subprocess.Popen([sys.executable,
  428.                                   "-c", "import os; os.abort()"])
  429.             p.wait()
  430.             self.assertEqual(-p.returncode, signal.SIGABRT)
  431.  
  432.         def test_preexec(self):
  433.             # preexec function
  434.             p = subprocess.Popen([sys.executable, "-c",
  435.                               'import sys,os;' \
  436.                               'sys.stdout.write(os.getenv("FRUIT"))'],
  437.                              stdout=subprocess.PIPE,
  438.                              preexec_fn=lambda: os.putenv("FRUIT", "apple"))
  439.             self.assertEqual(p.stdout.read(), "apple")
  440.  
  441.         def test_args_string(self):
  442.             # args is a string
  443.             f, fname = self.mkstemp()
  444.             os.write(f, "#!/bin/sh\n")
  445.             os.write(f, "exec %s -c 'import sys; sys.exit(47)'\n" %
  446.                         sys.executable)
  447.             os.close(f)
  448.             os.chmod(fname, 0700)
  449.             p = subprocess.Popen(fname)
  450.             p.wait()
  451.             os.remove(fname)
  452.             self.assertEqual(p.returncode, 47)
  453.  
  454.         def test_invalid_args(self):
  455.             # invalid arguments should raise ValueError
  456.             self.assertRaises(ValueError, subprocess.call,
  457.                               [sys.executable,
  458.                                "-c", "import sys; sys.exit(47)"],
  459.                               startupinfo=47)
  460.             self.assertRaises(ValueError, subprocess.call,
  461.                               [sys.executable,
  462.                                "-c", "import sys; sys.exit(47)"],
  463.                               creationflags=47)
  464.  
  465.         def test_shell_sequence(self):
  466.             # Run command through the shell (sequence)
  467.             newenv = os.environ.copy()
  468.             newenv["FRUIT"] = "apple"
  469.             p = subprocess.Popen(["echo $FRUIT"], shell=1,
  470.                                  stdout=subprocess.PIPE,
  471.                                  env=newenv)
  472.             self.assertEqual(p.stdout.read().strip(), "apple")
  473.  
  474.         def test_shell_string(self):
  475.             # Run command through the shell (string)
  476.             newenv = os.environ.copy()
  477.             newenv["FRUIT"] = "apple"
  478.             p = subprocess.Popen("echo $FRUIT", shell=1,
  479.                                  stdout=subprocess.PIPE,
  480.                                  env=newenv)
  481.             self.assertEqual(p.stdout.read().strip(), "apple")
  482.  
  483.         def test_call_string(self):
  484.             # call() function with string argument on UNIX
  485.             f, fname = self.mkstemp()
  486.             os.write(f, "#!/bin/sh\n")
  487.             os.write(f, "exec %s -c 'import sys; sys.exit(47)'\n" %
  488.                         sys.executable)
  489.             os.close(f)
  490.             os.chmod(fname, 0700)
  491.             rc = subprocess.call(fname)
  492.             os.remove(fname)
  493.             self.assertEqual(rc, 47)
  494.  
  495.  
  496.     #
  497.     # Windows tests
  498.     #
  499.     if mswindows:
  500.         def test_startupinfo(self):
  501.             # startupinfo argument
  502.             # We uses hardcoded constants, because we do not want to
  503.             # depend on win32all.
  504.             STARTF_USESHOWWINDOW = 1
  505.             SW_MAXIMIZE = 3
  506.             startupinfo = subprocess.STARTUPINFO()
  507.             startupinfo.dwFlags = STARTF_USESHOWWINDOW
  508.             startupinfo.wShowWindow = SW_MAXIMIZE
  509.             # Since Python is a console process, it won't be affected
  510.             # by wShowWindow, but the argument should be silently
  511.             # ignored
  512.             subprocess.call([sys.executable, "-c", "import sys; sys.exit(0)"],
  513.                         startupinfo=startupinfo)
  514.  
  515.         def test_creationflags(self):
  516.             # creationflags argument
  517.             CREATE_NEW_CONSOLE = 16
  518.             sys.stderr.write("    a DOS box should flash briefly ...\n")
  519.             subprocess.call(sys.executable +
  520.                                 ' -c "import time; time.sleep(0.25)"',
  521.                             creationflags=CREATE_NEW_CONSOLE)
  522.  
  523.         def test_invalid_args(self):
  524.             # invalid arguments should raise ValueError
  525.             self.assertRaises(ValueError, subprocess.call,
  526.                               [sys.executable,
  527.                                "-c", "import sys; sys.exit(47)"],
  528.                               preexec_fn=lambda: 1)
  529.             self.assertRaises(ValueError, subprocess.call,
  530.                               [sys.executable,
  531.                                "-c", "import sys; sys.exit(47)"],
  532.                               close_fds=True)
  533.  
  534.         def test_shell_sequence(self):
  535.             # Run command through the shell (sequence)
  536.             newenv = os.environ.copy()
  537.             newenv["FRUIT"] = "physalis"
  538.             p = subprocess.Popen(["set"], shell=1,
  539.                                  stdout=subprocess.PIPE,
  540.                                  env=newenv)
  541.             self.assertNotEqual(p.stdout.read().find("physalis"), -1)
  542.  
  543.         def test_shell_string(self):
  544.             # Run command through the shell (string)
  545.             newenv = os.environ.copy()
  546.             newenv["FRUIT"] = "physalis"
  547.             p = subprocess.Popen("set", shell=1,
  548.                                  stdout=subprocess.PIPE,
  549.                                  env=newenv)
  550.             self.assertNotEqual(p.stdout.read().find("physalis"), -1)
  551.  
  552.         def test_call_string(self):
  553.             # call() function with string argument on Windows
  554.             rc = subprocess.call(sys.executable +
  555.                                  ' -c "import sys; sys.exit(47)"')
  556.             self.assertEqual(rc, 47)
  557.  
  558.  
  559. def test_main():
  560.     test_support.run_unittest(ProcessTestCase)
  561.  
  562. if __name__ == "__main__":
  563.     test_main()
  564.