text: # -*- coding: utf-8 -*-
  """Tests for the key interactiveshell module.
  
  Historically the main classes in interactiveshell have been under-tested.  This
  module should grow as many single-method tests as possible to trap many of the
  recurring bugs we seem to encounter with high-level interaction.
  """
  
  # Copyright (c) IPython Development Team.
  # Distributed under the terms of the Modified BSD License.
  
  import asyncio
  import ast
  import os
  import signal
  import shutil
  import sys
  import tempfile
  import unittest
  from unittest import mock
  
  from os.path import join
  
  import nose.tools as nt
  
  from IPython.core.error import InputRejected
  from IPython.core.inputtransformer import InputTransformer
  from IPython.core import interactiveshell
  from IPython.testing.decorators import (
      skipif, skip_win32, onlyif_unicode_paths, onlyif_cmds_exist,
  )
  from IPython.testing import tools as tt
  from IPython.utils.process import find_cmd
  
  #-----------------------------------------------------------------------------
  # Globals
  #-----------------------------------------------------------------------------
  # This is used by every single test, no point repeating it ad nauseam
  
  #-----------------------------------------------------------------------------
  # Tests
  #-----------------------------------------------------------------------------
  
  class DerivedInterrupt(KeyboardInterrupt):
      pass
  
  class InteractiveShellTestCase(unittest.TestCase):
      def test_naked_string_cells(self):
          """Test that cells with only naked strings are fully executed"""
          # First, single-line inputs
          ip.run_cell('"a"\n')
          self.assertEqual(ip.user_ns['_'], 'a')
          # And also multi-line cells
          ip.run_cell('"""a\nb"""\n')
          self.assertEqual(ip.user_ns['_'], 'a\nb')
  
      def test_run_empty_cell(self):
          """Just make sure we don't get a horrible error with a blank
          cell of input. Yes, I did overlook that."""
          old_xc = ip.execution_count
          res = ip.run_cell('')
          self.assertEqual(ip.execution_count, old_xc)
          self.assertEqual(res.execution_count, None)
  
      def test_run_cell_multiline(self):
          """Multi-block, multi-line cells must execute correctly.
          """
          src = '\n'.join(["x=1",
                           "y=2",
                           "if 1:",
                           "    x += 1",
                           "    y += 1",])
          res = ip.run_cell(src)
          self.assertEqual(ip.user_ns['x'], 2)
          self.assertEqual(ip.user_ns['y'], 3)
          self.assertEqual(res.success, True)
          self.assertEqual(res.result, None)
  
      def test_multiline_string_cells(self):
          "Code sprinkled with multiline strings should execute (GH-306)"
          ip.run_cell('tmp=0')
          self.assertEqual(ip.user_ns['tmp'], 0)
          res = ip.run_cell('tmp=1;"""a\nb"""\n')
          self.assertEqual(ip.user_ns['tmp'], 1)
          self.assertEqual(res.success, True)
          self.assertEqual(res.result, "a\nb")
  
      def test_dont_cache_with_semicolon(self):
          "Ending a line with semicolon should not cache the returned object (GH-307)"
          oldlen = len(ip.user_ns['Out'])
          for cell in ['1;', '1;1;']:
              res = ip.run_cell(cell, store_history=True)
              newlen = len(ip.user_ns['Out'])
              self.assertEqual(oldlen, newlen)
              self.assertIsNone(res.result)
          i = 0
          #also test the default caching behavior
          for cell in ['1', '1;1']:
              ip.run_cell(cell, store_history=True)
              newlen = len(ip.user_ns['Out'])
              i += 1
              self.assertEqual(oldlen+i, newlen)
  
      def test_syntax_error(self):
          res = ip.run_cell("raise = 3")
          self.assertIsInstance(res.error_before_exec, SyntaxError)
  
      def test_In_variable(self):
          "Verify that In variable grows with user input (GH-284)"
          oldlen = len(ip.user_ns['In'])
          ip.run_cell('1;', store_history=True)
          newlen = len(ip.user_ns['In'])
          self.assertEqual(oldlen+1, newlen)
          self.assertEqual(ip.user_ns['In'][-1],'1;')
          
      def test_magic_names_in_string(self):
          ip.run_cell('a = """\n%exit\n"""')
          self.assertEqual(ip.user_ns['a'], '\n%exit\n')
      
      def test_trailing_newline(self):
          """test that running !(command) does not raise a SyntaxError"""
          ip.run_cell('!(true)\n', False)
          ip.run_cell('!(true)\n\n\n', False)
      
      def test_gh_597(self):
          """Pretty-printing lists of objects with non-ascii reprs may cause
          problems."""
          class Spam(object):
              def __repr__(self):
                  return "\xe9"*50
          import IPython.core.formatters
          f = IPython.core.formatters.PlainTextFormatter()
          f([Spam(),Spam()])
      
  
      def test_future_flags(self):
          """Check that future flags are used for parsing code (gh-777)"""
          ip.run_cell('from __future__ import barry_as_FLUFL')
          try:
              ip.run_cell('prfunc_return_val = 1 <> 2')
              assert 'prfunc_return_val' in ip.user_ns
          finally:
              # Reset compiler flags so we don't mess up other tests.
              ip.compile.reset_compiler_flags()
  
      def test_can_pickle(self):
          "Can we pickle objects defined interactively (GH-29)"
          ip = get_ipython()
          ip.reset()
          ip.run_cell(("class Mylist(list):\n"
                       "    def __init__(self,x=[]):\n"
                       "        list.__init__(self,x)"))
          ip.run_cell("w=Mylist([1,2,3])")
          
          from pickle import dumps
          
          # We need to swap in our main module - this is only necessary
          # inside the test framework, because IPython puts the interactive module
          # in place (but the test framework undoes this).
          _main = sys.modules['__main__']
          sys.modules['__main__'] = ip.user_module
          try:
              res = dumps(ip.user_ns["w"])
          finally:
              sys.modules['__main__'] = _main
          self.assertTrue(isinstance(res, bytes))
          
      def test_global_ns(self):
          "Code in functions must be able to access variables outside them."
          ip = get_ipython()
          ip.run_cell("a = 10")
          ip.run_cell(("def f(x):\n"
                       "    return x + a"))
          ip.run_cell("b = f(12)")
          self.assertEqual(ip.user_ns["b"], 22)
  
      def test_bad_custom_tb(self):
          """Check that InteractiveShell is protected from bad custom exception handlers"""
          ip.set_custom_exc((IOError,), lambda etype,value,tb: 1/0)
          self.assertEqual(ip.custom_exceptions, (IOError,))
          with tt.AssertPrints("Custom TB Handler failed", channel='stderr'):
              ip.run_cell(u'raise IOError("foo")')
          self.assertEqual(ip.custom_exceptions, ())
  
      def test_bad_custom_tb_return(self):
          """Check that InteractiveShell is protected from bad return types in custom exception handlers"""
          ip.set_custom_exc((NameError,),lambda etype,value,tb, tb_offset=None: 1)
          self.assertEqual(ip.custom_exceptions, (NameError,))
          with tt.AssertPrints("Custom TB Handler failed", channel='stderr'):
              ip.run_cell(u'a=abracadabra')
          self.assertEqual(ip.custom_exceptions, ())
  
      def test_drop_by_id(self):
          myvars = {"a":object(), "b":object(), "c": object()}
          ip.push(myvars, interactive=False)
          for name in myvars:
              assert name in ip.user_ns, name
              assert name in ip.user_ns_hidden, name
          ip.user_ns['b'] = 12
          ip.drop_by_id(myvars)
          for name in ["a", "c"]:
              assert name not in ip.user_ns, name
              assert name not in ip.user_ns_hidden, name
          assert ip.user_ns['b'] == 12
          ip.reset()
  
      def test_var_expand(self):
          ip.user_ns['f'] = u'Ca\xf1o'
          self.assertEqual(ip.var_expand(u'echo $f'), u'echo Ca\xf1o')
          self.assertEqual(ip.var_expand(u'echo {f}'), u'echo Ca\xf1o')
          self.assertEqual(ip.var_expand(u'echo {f[:-1]}'), u'echo Ca\xf1')
          self.assertEqual(ip.var_expand(u'echo {1*2}'), u'echo 2')
          
          self.assertEqual(ip.var_expand(u"grep x | awk '{print $1}'"), u"grep x | awk '{print $1}'")
  
          ip.user_ns['f'] = b'Ca\xc3\xb1o'
          # This should not raise any exception:
          ip.var_expand(u'echo $f')
     
      def test_var_expand_local(self):
          """Test local variable expansion in !system and %magic calls"""
          # !system
          ip.run_cell('def test():\n'
                      '    lvar = "ttt"\n'
                      '    ret = !echo {lvar}\n'
                      '    return ret[0]\n')
          res = ip.user_ns['test']()
          nt.assert_in('ttt', res)
          
          # %magic
          ip.run_cell('def makemacro():\n'
                      '    macroname = "macro_var_expand_locals"\n'
                      '    %macro {macroname} codestr\n')
          ip.user_ns['codestr'] = "str(12)"
          ip.run_cell('makemacro()')
          nt.assert_in('macro_var_expand_locals', ip.user_ns)
      
      def test_var_expand_self(self):
          """Test variable expansion with the name 'self', which was failing.
          
          See https://github.com/ipython/ipython/issues/1878#issuecomment-7698218
          """
          ip.run_cell('class cTest:\n'
                      '  classvar="see me"\n'
                      '  def test(self):\n'
                      '    res = !echo Variable: {self.classvar}\n'
                      '    return res[0]\n')
          nt.assert_in('see me', ip.user_ns['cTest']().test())
      
      def test_bad_var_expand(self):
          """var_expand on invalid formats shouldn't raise"""
          # SyntaxError
          self.assertEqual(ip.var_expand(u"{'a':5}"), u"{'a':5}")
          # NameError
          self.assertEqual(ip.var_expand(u"{asdf}"), u"{asdf}")
          # ZeroDivisionError
          self.assertEqual(ip.var_expand(u"{1/0}"), u"{1/0}")
      
      def test_silent_postexec(self):
          """run_cell(silent=True) doesn't invoke pre/post_run_cell callbacks"""
          pre_explicit = mock.Mock()
          pre_always = mock.Mock()
          post_explicit = mock.Mock()
          post_always = mock.Mock()
          all_mocks = [pre_explicit, pre_always, post_explicit, post_always]
          
          ip.events.register('pre_run_cell', pre_explicit)
          ip.events.register('pre_execute', pre_always)
          ip.events.register('post_run_cell', post_explicit)
          ip.events.register('post_execute', post_always)
          
          try:
              ip.run_cell("1", silent=True)
              assert pre_always.called
              assert not pre_explicit.called
              assert post_always.called
              assert not post_explicit.called
              # double-check that non-silent exec did what we expected
              # silent to avoid
              ip.run_cell("1")
              assert pre_explicit.called
              assert post_explicit.called
              info, = pre_explicit.call_args[0]
              result, = post_explicit.call_args[0]
              self.assertEqual(info, result.info)
              # check that post hooks are always called
              [m.reset_mock() for m in all_mocks]
              ip.run_cell("syntax error")
              assert pre_always.called
              assert pre_explicit.called
              assert post_always.called
              assert post_explicit.called
              info, = pre_explicit.call_args[0]
              result, = post_explicit.call_args[0]
              self.assertEqual(info, result.info)
          finally:
              # remove post-exec
              ip.events.unregister('pre_run_cell', pre_explicit)
              ip.events.unregister('pre_execute', pre_always)
              ip.events.unregister('post_run_cell', post_explicit)
              ip.events.unregister('post_execute', post_always)
      
      def test_silent_noadvance(self):
          """run_cell(silent=True) doesn't advance execution_count"""
          ec = ip.execution_count
          # silent should force store_history=False
          ip.run_cell("1", store_history=True, silent=True)
          
          self.assertEqual(ec, ip.execution_count)
          # double-check that non-silent exec did what we expected
          # silent to avoid
          ip.run_cell("1", store_history=True)
          self.assertEqual(ec+1, ip.execution_count)
      
      def test_silent_nodisplayhook(self):
          """run_cell(silent=True) doesn't trigger displayhook"""
          d = dict(called=False)
          
          trap = ip.display_trap
          save_hook = trap.hook
          
          def failing_hook(*args, **kwargs):
              d['called'] = True
          
          try:
              trap.hook = failing_hook
              res = ip.run_cell("1", silent=True)
              self.assertFalse(d['called'])
              self.assertIsNone(res.result)
              # double-check that non-silent exec did what we expected
              # silent to avoid
              ip.run_cell("1")
              self.assertTrue(d['called'])
          finally:
              trap.hook = save_hook
  
      def test_ofind_line_magic(self):
          from IPython.core.magic import register_line_magic
          
          @register_line_magic
          def lmagic(line):
              "A line magic"
  
          # Get info on line magic
          lfind = ip._ofind('lmagic')
          info = dict(found=True, isalias=False, ismagic=True,
                      namespace = 'IPython internal', obj= lmagic.__wrapped__,
                      parent = None)
          nt.assert_equal(lfind, info)
          
      def test_ofind_cell_magic(self):
          from IPython.core.magic import register_cell_magic
          
          @register_cell_magic
          def cmagic(line, cell):
              "A cell magic"
  
          # Get info on cell magic
          find = ip._ofind('cmagic')
          info = dict(found=True, isalias=False, ismagic=True,
                      namespace = 'IPython internal', obj= cmagic.__wrapped__,
                      parent = None)
          nt.assert_equal(find, info)
  
      def test_ofind_property_with_error(self):
          class A(object):
              @property
              def foo(self):
                  raise NotImplementedError()
          a = A()
  
          found = ip._ofind('a.foo', [('locals', locals())])
          info = dict(found=True, isalias=False, ismagic=False,
                      namespace='locals', obj=A.foo, parent=a)
          nt.assert_equal(found, info)
  
      def test_ofind_multiple_attribute_lookups(self):
          class A(object):
              @property
              def foo(self):
                  raise NotImplementedError()
  
          a = A()
          a.a = A()
          a.a.a = A()
  
          found = ip._ofind('a.a.a.foo', [('locals', locals())])
          info = dict(found=True, isalias=False, ismagic=False,
                      namespace='locals', obj=A.foo, parent=a.a.a)
          nt.assert_equal(found, info)
  
      def test_ofind_slotted_attributes(self):
          class A(object):
              __slots__ = ['foo']
              def __init__(self):
                  self.foo = 'bar'
  
          a = A()
          found = ip._ofind('a.foo', [('locals', locals())])
          info = dict(found=True, isalias=False, ismagic=False,
                      namespace='locals', obj=a.foo, parent=a)
          nt.assert_equal(found, info)
  
          found = ip._ofind('a.bar', [('locals', locals())])
          info = dict(found=False, isalias=False, ismagic=False,
                      namespace=None, obj=None, parent=a)
          nt.assert_equal(found, info)
  
      def test_ofind_prefers_property_to_instance_level_attribute(self):
          class A(object):
              @property
              def foo(self):
                  return 'bar'
          a = A()
          a.__dict__['foo'] = 'baz'
          nt.assert_equal(a.foo, 'bar')
          found = ip._ofind('a.foo', [('locals', locals())])
          nt.assert_is(found['obj'], A.foo)
  
      def test_custom_syntaxerror_exception(self):
          called = []
          def my_handler(shell, etype, value, tb, tb_offset=None):
              called.append(etype)
              shell.showtraceback((etype, value, tb), tb_offset=tb_offset)
  
          ip.set_custom_exc((SyntaxError,), my_handler)
          try:
              ip.run_cell("1f")
              # Check that this was called, and only once.
              self.assertEqual(called, [SyntaxError])
          finally:
              # Reset the custom exception hook
              ip.set_custom_exc((), None)
  
      def test_custom_exception(self):
          called = []
          def my_handler(shell, etype, value, tb, tb_offset=None):
              called.append(etype)
              shell.showtraceback((etype, value, tb), tb_offset=tb_offset)
          
          ip.set_custom_exc((ValueError,), my_handler)
          try:
              res = ip.run_cell("raise ValueError('test')")
              # Check that this was called, and only once.
              self.assertEqual(called, [ValueError])
              # Check that the error is on the result object
              self.assertIsInstance(res.error_in_exec, ValueError)
          finally:
              # Reset the custom exception hook
              ip.set_custom_exc((), None)
      
      def test_mktempfile(self):
          filename = ip.mktempfile()
          # Check that we can open the file again on Windows
          with open(filename, 'w') as f:
              f.write('abc')
  
          filename = ip.mktempfile(data='blah')
          with open(filename, 'r') as f:
              self.assertEqual(f.read(), 'blah')
  
      def test_new_main_mod(self):
          # Smoketest to check that this accepts a unicode module name
          name = u'jiefmw'
          mod = ip.new_main_mod(u'%s.py' % name, name)
          self.assertEqual(mod.__name__, name)
  
      def test_get_exception_only(self):
          try:
              raise KeyboardInterrupt
          except KeyboardInterrupt:
              msg = ip.get_exception_only()
          self.assertEqual(msg, 'KeyboardInterrupt\n')
  
          try:
              raise DerivedInterrupt("foo")
          except KeyboardInterrupt:
              msg = ip.get_exception_only()
          self.assertEqual(msg, 'IPython.core.tests.test_interactiveshell.DerivedInterrupt: foo\n')
  
      def test_inspect_text(self):
          ip.run_cell('a = 5')
          text = ip.object_inspect_text('a')
          self.assertIsInstance(text, str)
  
      def test_last_execution_result(self):
          """ Check that last execution result gets set correctly (GH-10702) """
          result = ip.run_cell('a = 5; a')
          self.assertTrue(ip.last_execution_succeeded)
          self.assertEqual(ip.last_execution_result.result, 5)
  
          result = ip.run_cell('a = x_invalid_id_x')
          self.assertFalse(ip.last_execution_succeeded)
          self.assertFalse(ip.last_execution_result.success)
          self.assertIsInstance(ip.last_execution_result.error_in_exec, NameError)
  
      def test_reset_aliasing(self):
          """ Check that standard posix aliases work after %reset. """
          if os.name != 'posix':
              return
  
          ip.reset()
          for cmd in ('clear', 'more', 'less', 'man'):
              res = ip.run_cell('%' + cmd)
              self.assertEqual(res.success, True)
  
  
  class TestSafeExecfileNonAsciiPath(unittest.TestCase):
  
      @onlyif_unicode_paths
      def setUp(self):
          self.BASETESTDIR = tempfile.mkdtemp()
          self.TESTDIR = join(self.BASETESTDIR, u"åäö")
          os.mkdir(self.TESTDIR)
          with open(join(self.TESTDIR, u"åäötestscript.py"), "w") as sfile:
              sfile.write("pass\n")
          self.oldpath = os.getcwd()
          os.chdir(self.TESTDIR)
          self.fname = u"åäötestscript.py"
  
      def tearDown(self):
          os.chdir(self.oldpath)
          shutil.rmtree(self.BASETESTDIR)
  
      @onlyif_unicode_paths
      def test_1(self):
          """Test safe_execfile with non-ascii path
          """
          ip.safe_execfile(self.fname, {}, raise_exceptions=True)
  
  class ExitCodeChecks(tt.TempFileMixin):
  
      def setUp(self):
          self.system = ip.system_raw
  
      def test_exit_code_ok(self):
          self.system('exit 0')
          self.assertEqual(ip.user_ns['_exit_code'], 0)
  
      def test_exit_code_error(self):
          self.system('exit 1')
          self.assertEqual(ip.user_ns['_exit_code'], 1)
      
      @skipif(not hasattr(signal, 'SIGALRM'))
      def test_exit_code_signal(self):
          self.mktmp("import signal, time\n"
                     "signal.setitimer(signal.ITIMER_REAL, 0.1)\n"
                     "time.sleep(1)\n")
          self.system("%s %s" % (sys.executable, self.fname))
          self.assertEqual(ip.user_ns['_exit_code'], -signal.SIGALRM)
      
      @onlyif_cmds_exist("csh")
      def test_exit_code_signal_csh(self):
          SHELL = os.environ.get('SHELL', None)
          os.environ['SHELL'] = find_cmd("csh")
          try:
              self.test_exit_code_signal()
          finally:
              if SHELL is not None:
                  os.environ['SHELL'] = SHELL
              else:
                  del os.environ['SHELL']
  
  
  class TestSystemRaw(ExitCodeChecks):
  
      def setUp(self):
          super().setUp()
          self.system = ip.system_raw
  
      @onlyif_unicode_paths
      def test_1(self):
          """Test system_raw with non-ascii cmd
          """
          cmd = u'''python -c "'åäö'"   '''
          ip.system_raw(cmd)
  
      @mock.patch('subprocess.call', side_effect=KeyboardInterrupt)
      @mock.patch('os.system', side_effect=KeyboardInterrupt)
      def test_control_c(self, *mocks):
          try:
              self.system("sleep 1 # wont happen")
          except KeyboardInterrupt:
              self.fail("system call should intercept "
                        "keyboard interrupt from subprocess.call")
          self.assertEqual(ip.user_ns['_exit_code'], -signal.SIGINT)
  
  # TODO: Exit codes are currently ignored on Windows.
  class TestSystemPipedExitCode(ExitCodeChecks):
  
      def setUp(self):
          super().setUp()
          self.system = ip.system_piped
  
      @skip_win32
      def test_exit_code_ok(self):
          ExitCodeChecks.test_exit_code_ok(self)
  
      @skip_win32
      def test_exit_code_error(self):
          ExitCodeChecks.test_exit_code_error(self)
  
      @skip_win32
      def test_exit_code_signal(self):
          ExitCodeChecks.test_exit_code_signal(self)
  
  class TestModules(tt.TempFileMixin):
      def test_extraneous_loads(self):
          """Test we're not loading modules on startup that we shouldn't.
          """
          self.mktmp("import sys\n"
                     "print('numpy' in sys.modules)\n"
                     "print('ipyparallel' in sys.modules)\n"
                     "print('ipykernel' in sys.modules)\n"
                     )
          out = "False\nFalse\nFalse\n"
          tt.ipexec_validate(self.fname, out)
  
  class Negator(ast.NodeTransformer):
      """Negates all number literals in an AST."""
  
      # for python 3.7 and earlier
      def visit_Num(self, node):
          node.n = -node.n
          return node
  
      # for python 3.8+
      def visit_Constant(self, node):
          if isinstance(node.value, int):
              return self.visit_Num(node)
          return node
  
  class TestAstTransform(unittest.TestCase):
      def setUp(self):
          self.negator = Negator()
          ip.ast_transformers.append(self.negator)
      
      def tearDown(self):
          ip.ast_transformers.remove(self.negator)
      
      def test_run_cell(self):
          with tt.AssertPrints('-34'):
              ip.run_cell('print (12 + 22)')
          
          # A named reference to a number shouldn't be transformed.
          ip.user_ns['n'] = 55
          with tt.AssertNotPrints('-55'):
              ip.run_cell('print (n)')
      
      def test_timeit(self):
          called = set()
          def f(x):
              called.add(x)
          ip.push({'f':f})
          
          with tt.AssertPrints("std. dev. of"):
              ip.run_line_magic("timeit", "-n1 f(1)")
          self.assertEqual(called, {-1})
          called.clear()
  
          with tt.AssertPrints("std. dev. of"):
              ip.run_cell_magic("timeit", "-n1 f(2)", "f(3)")
          self.assertEqual(called, {-2, -3})
      
      def test_time(self):
          called = []
          def f(x):
              called.append(x)
          ip.push({'f':f})
          
          # Test with an expression
          with tt.AssertPrints("Wall time: "):
              ip.run_line_magic("time", "f(5+9)")
          self.assertEqual(called, [-14])
          called[:] = []
          
          # Test with a statement (different code path)
          with tt.AssertPrints("Wall time: "):
              ip.run_line_magic("time", "a = f(-3 + -2)")
          self.assertEqual(called, [5])
      
      def test_macro(self):
          ip.push({'a':10})
          # The AST transformation makes this do a+=-1
          ip.define_macro("amacro", "a+=1\nprint(a)")
          
          with tt.AssertPrints("9"):
              ip.run_cell("amacro")
          with tt.AssertPrints("8"):
              ip.run_cell("amacro")
  
  class IntegerWrapper(ast.NodeTransformer):
      """Wraps all integers in a call to Integer()"""
  
      # for Python 3.7 and earlier
  
      # for Python 3.7 and earlier
      def visit_Num(self, node):
          if isinstance(node.n, int):
              return ast.Call(func=ast.Name(id='Integer', ctx=ast.Load()),
                              args=[node], keywords=[])
          return node
  
      # For Python 3.8+
      def visit_Constant(self, node):
          if isinstance(node.value, int):
              return self.visit_Num(node)
          return node
  
  
  class TestAstTransform2(unittest.TestCase):
      def setUp(self):
          self.intwrapper = IntegerWrapper()
          ip.ast_transformers.append(self.intwrapper)
          
          self.calls = []
          def Integer(*args):
              self.calls.append(args)
              return args
          ip.push({"Integer": Integer})
      
      def tearDown(self):
          ip.ast_transformers.remove(self.intwrapper)
          del ip.user_ns['Integer']
      
      def test_run_cell(self):
          ip.run_cell("n = 2")
          self.assertEqual(self.calls, [(2,)])
          
          # This shouldn't throw an error
          ip.run_cell("o = 2.0")
          self.assertEqual(ip.user_ns['o'], 2.0)
      
      def test_timeit(self):
          called = set()
          def f(x):
              called.add(x)
          ip.push({'f':f})
  
          with tt.AssertPrints("std. dev. of"):
              ip.run_line_magic("timeit", "-n1 f(1)")
          self.assertEqual(called, {(1,)})
          called.clear()
  
          with tt.AssertPrints("std. dev. of"):
              ip.run_cell_magic("timeit", "-n1 f(2)", "f(3)")
          self.assertEqual(called, {(2,), (3,)})
  
  class ErrorTransformer(ast.NodeTransformer):
      """Throws an error when it sees a number."""
  
      # for Python 3.7 and earlier
      def visit_Num(self, node):
          raise ValueError("test")
  
      # for Python 3.8+
      def visit_Constant(self, node):
          if isinstance(node.value, int):
              return self.visit_Num(node)
          return node
  
  
  class TestAstTransformError(unittest.TestCase):
      def test_unregistering(self):
          err_transformer = ErrorTransformer()
          ip.ast_transformers.append(err_transformer)
          
          with self.assertWarnsRegex(UserWarning, "It will be unregistered"):
              ip.run_cell("1 + 2")
          
          # This should have been removed.
          nt.assert_not_in(err_transformer, ip.ast_transformers)
  
  
  class StringRejector(ast.NodeTransformer):
      """Throws an InputRejected when it sees a string literal.
  
      Used to verify that NodeTransformers can signal that a piece of code should
      not be executed by throwing an InputRejected.
      """
      
      #for python 3.7 and earlier
      def visit_Str(self, node):
          raise InputRejected("test")
  
      # 3.8 only
      def visit_Constant(self, node):
          if isinstance(node.value, str):
              raise InputRejected("test")
          return node
  
  
  class TestAstTransformInputRejection(unittest.TestCase):
  
      def setUp(self):
          self.transformer = StringRejector()
          ip.ast_transformers.append(self.transformer)
  
      def tearDown(self):
          ip.ast_transformers.remove(self.transformer)
  
      def test_input_rejection(self):
          """Check that NodeTransformers can reject input."""
  
          expect_exception_tb = tt.AssertPrints("InputRejected: test")
          expect_no_cell_output = tt.AssertNotPrints("'unsafe'", suppress=False)
  
          # Run the same check twice to verify that the transformer is not
          # disabled after raising.
          with expect_exception_tb, expect_no_cell_output:
              ip.run_cell("'unsafe'")
  
          with expect_exception_tb, expect_no_cell_output:
              res = ip.run_cell("'unsafe'")
  
          self.assertIsInstance(res.error_before_exec, InputRejected)
  
  def test__IPYTHON__():
      # This shouldn't raise a NameError, that's all
      __IPYTHON__
  
  
  class DummyRepr(object):
      def __repr__(self):
          return "DummyRepr"
      
      def _repr_html_(self):
          return "<b>dummy</b>"
      
      def _repr_javascript_(self):
          return "console.log('hi');", {'key': 'value'}
      
  
  def test_user_variables():
      # enable all formatters
      ip.display_formatter.active_types = ip.display_formatter.format_types
      
      ip.user_ns['dummy'] = d = DummyRepr()
      keys = {'dummy', 'doesnotexist'}
      r = ip.user_expressions({ key:key for key in keys})
  
      nt.assert_equal(keys, set(r.keys()))
      dummy = r['dummy']
      nt.assert_equal({'status', 'data', 'metadata'}, set(dummy.keys()))
      nt.assert_equal(dummy['status'], 'ok')
      data = dummy['data']
      metadata = dummy['metadata']
      nt.assert_equal(data.get('text/html'), d._repr_html_())
      js, jsmd = d._repr_javascript_()
      nt.assert_equal(data.get('application/javascript'), js)
      nt.assert_equal(metadata.get('application/javascript'), jsmd)
      
      dne = r['doesnotexist']
      nt.assert_equal(dne['status'], 'error')
      nt.assert_equal(dne['ename'], 'NameError')
      
      # back to text only
      ip.display_formatter.active_types = ['text/plain']
      
  def test_user_expression():
      # enable all formatters
      ip.display_formatter.active_types = ip.display_formatter.format_types
      query = {
          'a' : '1 + 2',
          'b' : '1/0',
      }
      r = ip.user_expressions(query)
      import pprint
      pprint.pprint(r)
      nt.assert_equal(set(r.keys()), set(query.keys()))
      a = r['a']
      nt.assert_equal({'status', 'data', 'metadata'}, set(a.keys()))
      nt.assert_equal(a['status'], 'ok')
      data = a['data']
      metadata = a['metadata']
      nt.assert_equal(data.get('text/plain'), '3')
      
      b = r['b']
      nt.assert_equal(b['status'], 'error')
      nt.assert_equal(b['ename'], 'ZeroDivisionError')
      
      # back to text only
      ip.display_formatter.active_types = ['text/plain']
  
  
  class TestSyntaxErrorTransformer(unittest.TestCase):
      """Check that SyntaxError raised by an input transformer is handled by run_cell()"""
  
      @staticmethod
      def transformer(lines):
          for line in lines:
              pos = line.find('syntaxerror')
              if pos >= 0:
                  e = SyntaxError('input contains "syntaxerror"')
                  e.text = line
                  e.offset = pos + 1
                  raise e
          return lines
  
      def setUp(self):
          ip.input_transformers_post.append(self.transformer)
  
      def tearDown(self):
          ip.input_transformers_post.remove(self.transformer)
  
      def test_syntaxerror_input_transformer(self):
          with tt.AssertPrints('1234'):
              ip.run_cell('1234')
          with tt.AssertPrints('SyntaxError: invalid syntax'):
              ip.run_cell('1 2 3')   # plain python syntax error
          with tt.AssertPrints('SyntaxError: input contains "syntaxerror"'):
              ip.run_cell('2345  # syntaxerror')  # input transformer syntax error
          with tt.AssertPrints('3456'):
              ip.run_cell('3456')
  
  
  class TestWarningSuppression(unittest.TestCase):
      def test_warning_suppression(self):
          ip.run_cell("import warnings")
          try:
              with self.assertWarnsRegex(UserWarning, "asdf"):
                  ip.run_cell("warnings.warn('asdf')")
              # Here's the real test -- if we run that again, we should get the
              # warning again. Traditionally, each warning was only issued once per
              # IPython session (approximately), even if the user typed in new and
              # different code that should have also triggered the warning, leading
              # to much confusion.
              with self.assertWarnsRegex(UserWarning, "asdf"):
                  ip.run_cell("warnings.warn('asdf')")
          finally:
              ip.run_cell("del warnings")
  
  
      def test_deprecation_warning(self):
          ip.run_cell("""
  import warnings
  def wrn():
      warnings.warn(
          "I AM  A WARNING",
          DeprecationWarning
      )
          """)
          try:
              with self.assertWarnsRegex(DeprecationWarning, "I AM  A WARNING"):
                  ip.run_cell("wrn()")
          finally:
              ip.run_cell("del warnings")
              ip.run_cell("del wrn")
  
  
  class TestImportNoDeprecate(tt.TempFileMixin):
  
      def setUp(self):
          """Make a valid python temp file."""
          self.mktmp("""
  import warnings
  def wrn():
      warnings.warn(
          "I AM  A WARNING",
          DeprecationWarning
      )
  """)
          super().setUp()
  
      def test_no_dep(self):
          """
          No deprecation warning should be raised from imported functions
          """
          ip.run_cell("from {} import wrn".format(self.fname))
  
          with tt.AssertNotPrints("I AM  A WARNING"):
              ip.run_cell("wrn()")
          ip.run_cell("del wrn")
  
  
  def test_custom_exc_count():
      hook = mock.Mock(return_value=None)
      ip.set_custom_exc((SyntaxError,), hook)
      before = ip.execution_count
      ip.run_cell("def foo()", store_history=True)
      # restore default excepthook
      ip.set_custom_exc((), None)
      nt.assert_equal(hook.call_count, 1)
      nt.assert_equal(ip.execution_count, before + 1)
  
  
  def test_run_cell_async():
      loop = asyncio.get_event_loop()
      ip.run_cell("import asyncio")
      coro = ip.run_cell_async("await asyncio.sleep(0.01)\n5")
      assert asyncio.iscoroutine(coro)
      result = loop.run_until_complete(coro)
      assert isinstance(result, interactiveshell.ExecutionResult)
      assert result.result == 5
  
  
  def test_should_run_async():
      assert not ip.should_run_async("a = 5")
      assert ip.should_run_async("await x")
      assert ip.should_run_async("import asyncio; await asyncio.sleep(1)")
  