Modifications to support iOS as a development platform

Lib/test/test_pdb.py

 # A test suite for pdb; not very comprehensive at the moment.
 
 import doctest
 import pdb
 import sys
 import types
 import unittest
 import subprocess
 import textwrap
 
@@ skipping 896 matching lines @@
     -> for i in test_gen():
     (Pdb) next
     > <doctest test.test_pdb.test_pdb_next_command_subiterator[2]>(5)test_function()
     -> x = 123
     (Pdb) continue
     """
 
 
 class PdbTestCase(unittest.TestCase):
 
+    @unittest.skipUnless(hasattr(subprocess, 'Popen'), "test requires subprocess.Popen()")
     def run_pdb(self, script, commands):
         """Run 'script' lines with pdb and the pdb 'commands'."""
         filename = 'main.py'
         with open(filename, 'w') as f:
             f.write(textwrap.dedent(script))
         self.addCleanup(support.unlink, filename)
         self.addCleanup(support.rmtree, '__pycache__')
         cmd = [sys.executable, '-m', 'pdb', filename]
         stdout = stderr = None
         with subprocess.Popen(cmd, stdout=subprocess.PIPE,
@@ skipping 28 matching lines @@
             def bar():
                 pass
 
             def quux():
                 pass
             """,
             'bar',
             ('bar', 4),
         )
 
+    @unittest.skipUnless(hasattr(subprocess, 'Popen'), "test requires subprocess.Popen()")
     def test_issue7964(self):
         # open the file as binary so we can force \r\n newline
         with open(support.TESTFN, 'wb') as f:
             f.write(b'print("testing my pdb")\r\n')
         cmd = [sys.executable, '-m', 'pdb', support.TESTFN]
         proc = subprocess.Popen(cmd,
             stdout=subprocess.PIPE,
             stdin=subprocess.PIPE,
             stderr=subprocess.STDOUT,
             )
@@ skipping 31 matching lines @@
                 pass
         """
         with open('bar.py', 'w') as f:
             f.write(textwrap.dedent(bar))
         self.addCleanup(support.unlink, 'bar.py')
         stdout, stderr = self.run_pdb(script, commands)
         self.assertTrue(
             any('main.py(5)foo()->None' in l for l in stdout.splitlines()),
             'Fail to step into the caller after a return')
 
+    @unittest.skipUnless(hasattr(subprocess, 'Popen'), "test requires subprocess.Popen()")
     def test_issue13210(self):
         # invoking "continue" on a non-main thread triggered an exception
         # inside signal.signal
 
         # raises SkipTest if python was built without threads
         support.import_module('threading')
 
         with open(support.TESTFN, 'wb') as f:
             f.write(textwrap.dedent("""
                 import threading
@@ skipping 34 matching lines @@
 
 
 def load_tests(*args):
     from test import test_pdb
     suites = [unittest.makeSuite(PdbTestCase), doctest.DocTestSuite(test_pdb)]
     return unittest.TestSuite(suites)
 
 
 if __name__ == '__main__':
     unittest.main()