Again

IPython/core/tests/test_magic.py

@@ -1,1471 +1,1471 b''
 # -*- coding: utf-8 -*-
 """Tests for various magic functions."""
 
 import gc
 import io
 import os
 import re
 import shlex
 import sys
 import warnings
 from importlib import invalidate_caches
 from io import StringIO
 from pathlib import Path
 from textwrap import dedent
 from unittest import TestCase, mock
 
 import pytest
 
 from IPython import get_ipython
 from IPython.core import magic
 from IPython.core.error import UsageError
 from IPython.core.magic import (
     Magics,
     cell_magic,
     line_magic,
     magics_class,
     register_cell_magic,
     register_line_magic,
 )
 from IPython.core.magics import code, execution, logging, osm, script
 from IPython.testing import decorators as dec
 from IPython.testing import tools as tt
 from IPython.utils.io import capture_output
 from IPython.utils.process import find_cmd
 from IPython.utils.tempdir import TemporaryDirectory, TemporaryWorkingDirectory
 from IPython.utils.syspathcontext import prepended_to_syspath
 
 from .test_debugger import PdbTestInput
 
 from tempfile import NamedTemporaryFile
 
 @magic.magics_class
 class DummyMagics(magic.Magics): pass
 
 def test_extract_code_ranges():
     instr = "1 3 5-6 7-9 10:15 17: :10 10- -13 :"
     expected = [
         (0, 1),
         (2, 3),
         (4, 6),
         (6, 9),
         (9, 14),
         (16, None),
         (None, 9),
         (9, None),
         (None, 13),
         (None, None),
     ]
     actual = list(code.extract_code_ranges(instr))
     assert actual == expected
 
 def test_extract_symbols():
     source = """import foo\na = 10\ndef b():\n    return 42\n\n\nclass A: pass\n\n\n"""
     symbols_args = ["a", "b", "A", "A,b", "A,a", "z"]
     expected = [([], ['a']),
                 (["def b():\n    return 42\n"], []),
                 (["class A: pass\n"], []),
                 (["class A: pass\n", "def b():\n    return 42\n"], []),
                 (["class A: pass\n"], ['a']),
                 ([], ['z'])]
     for symbols, exp in zip(symbols_args, expected):
         assert code.extract_symbols(source, symbols) == exp
 
 
 def test_extract_symbols_raises_exception_with_non_python_code():
     source = ("=begin A Ruby program :)=end\n"
               "def hello\n"
               "puts 'Hello world'\n"
               "end")
     with pytest.raises(SyntaxError):
         code.extract_symbols(source, "hello")
 
 
 def test_magic_not_found():
     # magic not found raises UsageError
     with pytest.raises(UsageError):
         _ip.run_line_magic("doesntexist", "")
 
     # ensure result isn't success when a magic isn't found
     result = _ip.run_cell('%doesntexist')
     assert isinstance(result.error_in_exec, UsageError)
 
 
 def test_cell_magic_not_found():
     # magic not found raises UsageError
     with pytest.raises(UsageError):
         _ip.run_cell_magic('doesntexist', 'line', 'cell')
 
     # ensure result isn't success when a magic isn't found
     result = _ip.run_cell('%%doesntexist')
     assert isinstance(result.error_in_exec, UsageError)
 
 
 def test_magic_error_status():
     def fail(shell):
         1/0
     _ip.register_magic_function(fail)
     result = _ip.run_cell('%fail')
     assert isinstance(result.error_in_exec, ZeroDivisionError)
 
 
 def test_config():
     """ test that config magic does not raise
     can happen if Configurable init is moved too early into
     Magics.__init__ as then a Config object will be registered as a
     magic.
     """
     ## should not raise.
     _ip.run_line_magic("config", "")
 
 
 def test_config_available_configs():
     """ test that config magic prints available configs in unique and
     sorted order. """
     with capture_output() as captured:
         _ip.run_line_magic("config", "")
 
     stdout = captured.stdout
     config_classes = stdout.strip().split('\n')[1:]
     assert config_classes == sorted(set(config_classes))
 
 def test_config_print_class():
     """ test that config with a classname prints the class's options. """
     with capture_output() as captured:
         _ip.run_line_magic("config", "TerminalInteractiveShell")
 
     stdout = captured.stdout
     assert re.match(
         "TerminalInteractiveShell.* options", stdout.splitlines()[0]
     ), f"{stdout}\n\n1st line of stdout not like 'TerminalInteractiveShell.* options'"
 
 
 def test_rehashx():
     # clear up everything
     _ip.alias_manager.clear_aliases()
     del _ip.db['syscmdlist']
 
     _ip.run_line_magic("rehashx", "")
     # Practically ALL ipython development systems will have more than 10 aliases
 
     assert len(_ip.alias_manager.aliases) > 10
     for name, cmd in _ip.alias_manager.aliases:
         # we must strip dots from alias names
         assert "." not in name
 
     # rehashx must fill up syscmdlist
     scoms = _ip.db['syscmdlist']
     assert len(scoms) > 10
 
 
 def test_magic_parse_options():
     """Test that we don't mangle paths when parsing magic options."""
     ip = get_ipython()
     path = 'c:\\x'
     m = DummyMagics(ip)
     opts = m.parse_options('-f %s' % path,'f:')[0]
     # argv splitting is os-dependent
     if os.name == 'posix':
         expected = 'c:x'
     else:
         expected = path
     assert opts["f"] == expected
 
 
 def test_magic_parse_long_options():
     """Magic.parse_options can handle --foo=bar long options"""
     ip = get_ipython()
     m = DummyMagics(ip)
     opts, _ = m.parse_options("--foo --bar=bubble", "a", "foo", "bar=")
     assert "foo" in opts
     assert "bar" in opts
     assert opts["bar"] == "bubble"
 
 
 def doctest_hist_f():
     """Test %hist -f with temporary filename.
 
     In [9]: import tempfile
 
     In [10]: tfile = tempfile.mktemp('.py','tmp-ipython-')
 
     In [11]: %hist -nl -f $tfile 3
 
     In [13]: import os; os.unlink(tfile)
     """
 
 
 def doctest_hist_op():
     """Test %hist -op
 
     In [1]: class b(float):
        ...:     pass
        ...:
 
     In [2]: class s(object):
        ...:     def __str__(self):
        ...:         return 's'
        ...:
 
     In [3]:
 
     In [4]: class r(b):
        ...:     def __repr__(self):
        ...:         return 'r'
        ...:
 
     In [5]: class sr(s,r): pass
        ...:
 
     In [6]:
 
     In [7]: bb=b()
 
     In [8]: ss=s()
 
     In [9]: rr=r()
 
     In [10]: ssrr=sr()
 
     In [11]: 4.5
     Out[11]: 4.5
 
     In [12]: str(ss)
     Out[12]: 's'
 
     In [13]:
 
     In [14]: %hist -op
     >>> class b:
     ...     pass
     ...
     >>> class s(b):
     ...     def __str__(self):
     ...         return 's'
     ...
     >>>
     >>> class r(b):
     ...     def __repr__(self):
     ...         return 'r'
     ...
     >>> class sr(s,r): pass
     >>>
     >>> bb=b()
     >>> ss=s()
     >>> rr=r()
     >>> ssrr=sr()
     >>> 4.5
     4.5
     >>> str(ss)
     's'
     >>>
     """
 
 def test_hist_pof():
     ip = get_ipython()
     ip.run_cell("1+2", store_history=True)
     #raise Exception(ip.history_manager.session_number)
     #raise Exception(list(ip.history_manager._get_range_session()))
     with TemporaryDirectory() as td:
         tf = os.path.join(td, 'hist.py')
         ip.run_line_magic('history', '-pof %s' % tf)
         assert os.path.isfile(tf)
 
 
 def test_macro():
     ip = get_ipython()
     ip.history_manager.reset()   # Clear any existing history.
     cmds = ["a=1", "def b():\n  return a**2", "print(a,b())"]
     for i, cmd in enumerate(cmds, start=1):
         ip.history_manager.store_inputs(i, cmd)
     ip.run_line_magic("macro", "test 1-3")
     assert ip.user_ns["test"].value == "\n".join(cmds) + "\n"
 
     # List macros
     assert "test" in ip.run_line_magic("macro", "")
 
 
 def test_macro_run():
     """Test that we can run a multi-line macro successfully."""
     ip = get_ipython()
     ip.history_manager.reset()
     cmds = ["a=10", "a+=1", "print(a)", "%macro test 2-3"]
     for cmd in cmds:
         ip.run_cell(cmd, store_history=True)
     assert ip.user_ns["test"].value == "a+=1\nprint(a)\n"
     with tt.AssertPrints("12"):
         ip.run_cell("test")
     with tt.AssertPrints("13"):
         ip.run_cell("test")
 
 
 def test_magic_magic():
     """Test %magic"""
     ip = get_ipython()
     with capture_output() as captured:
         ip.run_line_magic("magic", "")
 
     stdout = captured.stdout
     assert "%magic" in stdout
     assert "IPython" in stdout
     assert "Available" in stdout
 
 
 @dec.skipif_not_numpy
 def test_numpy_reset_array_undec():
     "Test '%reset array' functionality"
     _ip.ex("import numpy as np")
     _ip.ex("a = np.empty(2)")
     assert "a" in _ip.user_ns
     _ip.run_line_magic("reset", "-f array")
     assert "a" not in _ip.user_ns
 
 
 def test_reset_out():
     "Test '%reset out' magic"
     _ip.run_cell("parrot = 'dead'", store_history=True)
     # test '%reset -f out', make an Out prompt
     _ip.run_cell("parrot", store_history=True)
     assert "dead" in [_ip.user_ns[x] for x in ("_", "__", "___")]
     _ip.run_line_magic("reset", "-f out")
     assert "dead" not in [_ip.user_ns[x] for x in ("_", "__", "___")]
     assert len(_ip.user_ns["Out"]) == 0
 
 
 def test_reset_in():
     "Test '%reset in' magic"
     # test '%reset -f in'
     _ip.run_cell("parrot", store_history=True)
     assert "parrot" in [_ip.user_ns[x] for x in ("_i", "_ii", "_iii")]
     _ip.run_line_magic("reset", "-f in")
     assert "parrot" not in [_ip.user_ns[x] for x in ("_i", "_ii", "_iii")]
     assert len(set(_ip.user_ns["In"])) == 1
 
 
 def test_reset_dhist():
     "Test '%reset dhist' magic"
     _ip.run_cell("tmp = [d for d in _dh]")  # copy before clearing
     _ip.run_line_magic("cd", os.path.dirname(pytest.__file__))
     _ip.run_line_magic("cd", "-")
     assert len(_ip.user_ns["_dh"]) > 0
     _ip.run_line_magic("reset", "-f dhist")
     assert len(_ip.user_ns["_dh"]) == 0
     _ip.run_cell("_dh = [d for d in tmp]")  # restore
 
 
 def test_reset_in_length():
     "Test that '%reset in' preserves In[] length"
     _ip.run_cell("print 'foo'")
     _ip.run_cell("reset -f in")
     assert len(_ip.user_ns["In"]) == _ip.displayhook.prompt_count + 1
 
 
 class TestResetErrors(TestCase):
 
     def test_reset_redefine(self):
 
         @magics_class
         class KernelMagics(Magics):
               @line_magic
               def less(self, shell): pass
 
         _ip.register_magics(KernelMagics)
 
         with self.assertLogs() as cm:
             # hack, we want to just capture logs, but assertLogs fails if not
             # logs get produce.
             # so log one things we ignore.
             import logging as log_mod
             log = log_mod.getLogger()
             log.info('Nothing')
             # end hack.
             _ip.run_cell("reset -f")
 
         assert len(cm.output) == 1
         for out in cm.output:
             assert "Invalid alias" not in out
 
 def test_tb_syntaxerror():
     """test %tb after a SyntaxError"""
     ip = get_ipython()
     ip.run_cell("for")
 
     # trap and validate stdout
     save_stdout = sys.stdout
     try:
         sys.stdout = StringIO()
         ip.run_cell("%tb")
         out = sys.stdout.getvalue()
     finally:
         sys.stdout = save_stdout
     # trim output, and only check the last line
     last_line = out.rstrip().splitlines()[-1].strip()
     assert last_line == "SyntaxError: invalid syntax"
 
 
 def test_time():
     ip = get_ipython()
 
     with tt.AssertPrints("Wall time: "):
         ip.run_cell("%time None")
 
     ip.run_cell("def f(kmjy):\n"
                 "    %time print (2*kmjy)")
 
     with tt.AssertPrints("Wall time: "):
         with tt.AssertPrints("hihi", suppress=False):
             ip.run_cell("f('hi')")
 
 
 # ';' at the end of %time prevents instruction value to be printed.
-# This tests fix for #13837 
+# This tests fix for #13837.
 def test_time_no_outputwith_semicolon():
     ip = get_ipython()
 
     with tt.AssertPrints(" 123456"):
         with tt.AssertPrints("Wall time: ", suppress=False):
             with tt.AssertPrints("CPU times: ", suppress=False):
                 ip.run_cell("%time 123000+456")
 
     with tt.AssertNotPrints(" 123456"):
         with tt.AssertPrints("Wall time: ", suppress=False):
             with tt.AssertPrints("CPU times: ", suppress=False):
                 ip.run_cell("%time 123000+456;")
 
 
 def test_time_last_not_expression():
     ip.run_cell("%%time\n"
                 "var_1 = 1\n"
                 "var_2 = 2\n")
     assert ip.user_ns['var_1'] == 1
     del ip.user_ns['var_1']
     assert ip.user_ns['var_2'] == 2
     del ip.user_ns['var_2']
 
 
 @dec.skip_win32
 def test_time2():
     ip = get_ipython()
 
     with tt.AssertPrints("CPU times: user "):
         ip.run_cell("%time None")
 
 def test_time3():
     """Erroneous magic function calls, issue gh-3334"""
     ip = get_ipython()
     ip.user_ns.pop('run', None)
 
     with tt.AssertNotPrints("not found", channel='stderr'):
         ip.run_cell("%%time\n"
                     "run = 0\n"
                     "run += 1")
 
 def test_multiline_time():
     """Make sure last statement from time return a value."""
     ip = get_ipython()
     ip.user_ns.pop('run', None)
 
     ip.run_cell(
         dedent(
             """\
         %%time
         a = "ho"
         b = "hey"
         a+b
         """
         )
     )
     assert ip.user_ns_hidden["_"] == "hohey"
 
 
 def test_time_local_ns():
     """
     Test that local_ns is actually global_ns when running a cell magic
     """
     ip = get_ipython()
     ip.run_cell("%%time\n" "myvar = 1")
     assert ip.user_ns["myvar"] == 1
     del ip.user_ns["myvar"]
 
 
 def test_doctest_mode():
     "Toggle doctest_mode twice, it should be a no-op and run without error"
     _ip.run_line_magic("doctest_mode", "")
     _ip.run_line_magic("doctest_mode", "")
 
 
 def test_parse_options():
     """Tests for basic options parsing in magics."""
     # These are only the most minimal of tests, more should be added later.  At
     # the very least we check that basic text/unicode calls work OK.
     m = DummyMagics(_ip)
     assert m.parse_options("foo", "")[1] == "foo"
     assert m.parse_options("foo", "")[1] == "foo"
 
 
 def test_parse_options_preserve_non_option_string():
     """Test to assert preservation of non-option part of magic-block, while parsing magic options."""
     m = DummyMagics(_ip)
     opts, stmt = m.parse_options(
         " -n1  -r 13 _ = 314 + foo", "n:r:", preserve_non_opts=True
     )
     assert opts == {"n": "1", "r": "13"}
     assert stmt == "_ = 314 + foo"
 
 
 def test_run_magic_preserve_code_block():
     """Test to assert preservation of non-option part of magic-block, while running magic."""
     _ip.user_ns["spaces"] = []
     _ip.run_line_magic(
         "timeit", "-n1 -r1 spaces.append([s.count(' ') for s in ['document']])"
     )
     assert _ip.user_ns["spaces"] == [[0]]
 
 
 def test_dirops():
     """Test various directory handling operations."""
     # curpath = lambda :os.path.splitdrive(os.getcwd())[1].replace('\\','/')
     curpath = os.getcwd
     startdir = os.getcwd()
     ipdir = os.path.realpath(_ip.ipython_dir)
     try:
         _ip.run_line_magic("cd", '"%s"' % ipdir)
         assert curpath() == ipdir
         _ip.run_line_magic("cd", "-")
         assert curpath() == startdir
         _ip.run_line_magic("pushd", '"%s"' % ipdir)
         assert curpath() == ipdir
         _ip.run_line_magic("popd", "")
         assert curpath() == startdir
     finally:
         os.chdir(startdir)
 
 
 def test_cd_force_quiet():
     """Test OSMagics.cd_force_quiet option"""
     _ip.config.OSMagics.cd_force_quiet = True
     osmagics = osm.OSMagics(shell=_ip)
 
     startdir = os.getcwd()
     ipdir = os.path.realpath(_ip.ipython_dir)
 
     try:
         with tt.AssertNotPrints(ipdir):
             osmagics.cd('"%s"' % ipdir)
         with tt.AssertNotPrints(startdir):
             osmagics.cd('-')
     finally:
         os.chdir(startdir)
 
 
 def test_xmode():
     # Calling xmode three times should be a no-op
     xmode = _ip.InteractiveTB.mode
     for i in range(4):
         _ip.run_line_magic("xmode", "")
     assert _ip.InteractiveTB.mode == xmode
 
 def test_reset_hard():
     monitor = []
     class A(object):
         def __del__(self):
             monitor.append(1)
         def __repr__(self):
             return "<A instance>"
 
     _ip.user_ns["a"] = A()
     _ip.run_cell("a")
 
     assert monitor == []
     _ip.run_line_magic("reset", "-f")
     assert monitor == [1]
 
 class TestXdel(tt.TempFileMixin):
     def test_xdel(self):
         """Test that references from %run are cleared by xdel."""
         src = ("class A(object):\n"
                "    monitor = []\n"
                "    def __del__(self):\n"
                "        self.monitor.append(1)\n"
                "a = A()\n")
         self.mktmp(src)
         # %run creates some hidden references...
         _ip.run_line_magic("run", "%s" % self.fname)
         # ... as does the displayhook.
         _ip.run_cell("a")
 
         monitor = _ip.user_ns["A"].monitor
         assert monitor == []
 
         _ip.run_line_magic("xdel", "a")
 
         # Check that a's __del__ method has been called.
         gc.collect(0)
         assert monitor == [1]
 
 def doctest_who():
     """doctest for %who
 
     In [1]: %reset -sf
 
     In [2]: alpha = 123
 
     In [3]: beta = 'beta'
 
     In [4]: %who int
     alpha
 
     In [5]: %who str
     beta
 
     In [6]: %whos
     Variable   Type    Data/Info
     ----------------------------
     alpha      int     123
     beta       str     beta
 
     In [7]: %who_ls
     Out[7]: ['alpha', 'beta']
     """
 
 def test_whos():
     """Check that whos is protected against objects where repr() fails."""
     class A(object):
         def __repr__(self):
             raise Exception()
     _ip.user_ns['a'] = A()
     _ip.run_line_magic("whos", "")
 
 def doctest_precision():
     """doctest for %precision
 
     In [1]: f = get_ipython().display_formatter.formatters['text/plain']
 
     In [2]: %precision 5
     Out[2]: '%.5f'
 
     In [3]: f.float_format
     Out[3]: '%.5f'
 
     In [4]: %precision %e
     Out[4]: '%e'
 
     In [5]: f(3.1415927)
     Out[5]: '3.141593e+00'
     """
 
 def test_debug_magic():
     """Test debugging a small code with %debug
 
     In [1]: with PdbTestInput(['c']):
        ...:     %debug print("a b") #doctest: +ELLIPSIS
        ...:
     ...
     ipdb> c
     a b
     In [2]:
     """
 
 def test_psearch():
     with tt.AssertPrints("dict.fromkeys"):
         _ip.run_cell("dict.fr*?")
     with tt.AssertPrints("π.is_integer"):
         _ip.run_cell("π = 3.14;\nπ.is_integ*?")
 
 def test_timeit_shlex():
     """test shlex issues with timeit (#1109)"""
     _ip.ex("def f(*a,**kw): pass")
     _ip.run_line_magic("timeit", '-n1 "this is a bug".count(" ")')
     _ip.run_line_magic("timeit", '-r1 -n1 f(" ", 1)')
     _ip.run_line_magic("timeit", '-r1 -n1 f(" ", 1, " ", 2, " ")')
     _ip.run_line_magic("timeit", '-r1 -n1 ("a " + "b")')
     _ip.run_line_magic("timeit", '-r1 -n1 f("a " + "b")')
     _ip.run_line_magic("timeit", '-r1 -n1 f("a " + "b ")')
 
 
 def test_timeit_special_syntax():
     "Test %%timeit with IPython special syntax"
     @register_line_magic
     def lmagic(line):
         ip = get_ipython()
         ip.user_ns['lmagic_out'] = line
 
     # line mode test
     _ip.run_line_magic("timeit", "-n1 -r1 %lmagic my line")
     assert _ip.user_ns["lmagic_out"] == "my line"
     # cell mode test
     _ip.run_cell_magic("timeit", "-n1 -r1", "%lmagic my line2")
     assert _ip.user_ns["lmagic_out"] == "my line2"
 
 
 def test_timeit_return():
     """
     test whether timeit -o return object
     """
 
     res = _ip.run_line_magic('timeit','-n10 -r10 -o 1')
     assert(res is not None)
 
 def test_timeit_quiet():
     """
     test quiet option of timeit magic
     """
     with tt.AssertNotPrints("loops"):
         _ip.run_cell("%timeit -n1 -r1 -q 1")
 
 def test_timeit_return_quiet():
     with tt.AssertNotPrints("loops"):
         res = _ip.run_line_magic('timeit', '-n1 -r1 -q -o 1')
     assert (res is not None)
 
 def test_timeit_invalid_return():
     with pytest.raises(SyntaxError):
         _ip.run_line_magic('timeit', 'return')
 
 @dec.skipif(execution.profile is None)
 def test_prun_special_syntax():
     "Test %%prun with IPython special syntax"
     @register_line_magic
     def lmagic(line):
         ip = get_ipython()
         ip.user_ns['lmagic_out'] = line
 
     # line mode test
     _ip.run_line_magic("prun", "-q %lmagic my line")
     assert _ip.user_ns["lmagic_out"] == "my line"
     # cell mode test
     _ip.run_cell_magic("prun", "-q", "%lmagic my line2")
     assert _ip.user_ns["lmagic_out"] == "my line2"
 
 
 @dec.skipif(execution.profile is None)
 def test_prun_quotes():
     "Test that prun does not clobber string escapes (GH #1302)"
     _ip.magic(r"prun -q x = '\t'")
     assert _ip.user_ns["x"] == "\t"
 
 
 def test_extension():
     # Debugging information for failures of this test
     print('sys.path:')
     for p in sys.path:
         print(' ', p)
     print('CWD', os.getcwd())
 
     pytest.raises(ImportError, _ip.magic, "load_ext daft_extension")
     daft_path = os.path.join(os.path.dirname(__file__), "daft_extension")
     sys.path.insert(0, daft_path)
     try:
         _ip.user_ns.pop('arq', None)
         invalidate_caches()   # Clear import caches
         _ip.run_line_magic("load_ext", "daft_extension")
         assert _ip.user_ns["arq"] == 185
         _ip.run_line_magic("unload_ext", "daft_extension")
         assert 'arq' not in _ip.user_ns
     finally:
         sys.path.remove(daft_path)
 
 
 def test_notebook_export_json():
     pytest.importorskip("nbformat")
     _ip = get_ipython()
     _ip.history_manager.reset()   # Clear any existing history.
     cmds = ["a=1", "def b():\n  return a**2", "print('noël, été', b())"]
     for i, cmd in enumerate(cmds, start=1):
         _ip.history_manager.store_inputs(i, cmd)
     with TemporaryDirectory() as td:
         outfile = os.path.join(td, "nb.ipynb")
         _ip.run_line_magic("notebook", "%s" % outfile)
 
 
 class TestEnv(TestCase):
 
     def test_env(self):
         env = _ip.run_line_magic("env", "")
         self.assertTrue(isinstance(env, dict))
 
     def test_env_secret(self):
         env = _ip.run_line_magic("env", "")
         hidden = "<hidden>"
         with mock.patch.dict(
             os.environ,
             {
                 "API_KEY": "abc123",
                 "SECRET_THING": "ssshhh",
                 "JUPYTER_TOKEN": "",
                 "VAR": "abc"
             }
         ):
             env = _ip.run_line_magic("env", "")
         assert env["API_KEY"] == hidden
         assert env["SECRET_THING"] == hidden
         assert env["JUPYTER_TOKEN"] == hidden
         assert env["VAR"] == "abc"
 
     def test_env_get_set_simple(self):
         env = _ip.run_line_magic("env", "var val1")
         self.assertEqual(env, None)
         self.assertEqual(os.environ["var"], "val1")
         self.assertEqual(_ip.run_line_magic("env", "var"), "val1")
         env = _ip.run_line_magic("env", "var=val2")
         self.assertEqual(env, None)
         self.assertEqual(os.environ['var'], 'val2')
 
     def test_env_get_set_complex(self):
         env = _ip.run_line_magic("env", "var 'val1 '' 'val2")
         self.assertEqual(env, None)
         self.assertEqual(os.environ['var'], "'val1 '' 'val2")
         self.assertEqual(_ip.run_line_magic("env", "var"), "'val1 '' 'val2")
         env = _ip.run_line_magic("env", 'var=val2 val3="val4')
         self.assertEqual(env, None)
         self.assertEqual(os.environ['var'], 'val2 val3="val4')
 
     def test_env_set_bad_input(self):
         self.assertRaises(UsageError, lambda: _ip.run_line_magic("set_env", "var"))
 
     def test_env_set_whitespace(self):
         self.assertRaises(UsageError, lambda: _ip.run_line_magic("env", "var A=B"))
 
 
 class CellMagicTestCase(TestCase):
 
     def check_ident(self, magic):
         # Manually called, we get the result
         out = _ip.run_cell_magic(magic, "a", "b")
         assert out == ("a", "b")
         # Via run_cell, it goes into the user's namespace via displayhook
         _ip.run_cell("%%" + magic + " c\nd\n")
         assert _ip.user_ns["_"] == ("c", "d\n")
 
     def test_cell_magic_func_deco(self):
         "Cell magic using simple decorator"
         @register_cell_magic
         def cellm(line, cell):
             return line, cell
 
         self.check_ident('cellm')
 
     def test_cell_magic_reg(self):
         "Cell magic manually registered"
         def cellm(line, cell):
             return line, cell
 
         _ip.register_magic_function(cellm, 'cell', 'cellm2')
         self.check_ident('cellm2')
 
     def test_cell_magic_class(self):
         "Cell magics declared via a class"
         @magics_class
         class MyMagics(Magics):
 
             @cell_magic
             def cellm3(self, line, cell):
                 return line, cell
 
         _ip.register_magics(MyMagics)
         self.check_ident('cellm3')
 
     def test_cell_magic_class2(self):
         "Cell magics declared via a class, #2"
         @magics_class
         class MyMagics2(Magics):
 
             @cell_magic('cellm4')
             def cellm33(self, line, cell):
                 return line, cell
 
         _ip.register_magics(MyMagics2)
         self.check_ident('cellm4')
         # Check that nothing is registered as 'cellm33'
         c33 = _ip.find_cell_magic('cellm33')
         assert c33 == None
 
 def test_file():
     """Basic %%writefile"""
     ip = get_ipython()
     with TemporaryDirectory() as td:
         fname = os.path.join(td, "file1")
         ip.run_cell_magic(
             "writefile",
             fname,
             "\n".join(
                 [
                     "line1",
                     "line2",
                 ]
             ),
         )
         s = Path(fname).read_text(encoding="utf-8")
         assert "line1\n" in s
         assert "line2" in s
 
 
 @dec.skip_win32
 def test_file_single_quote():
     """Basic %%writefile with embedded single quotes"""
     ip = get_ipython()
     with TemporaryDirectory() as td:
         fname = os.path.join(td, "'file1'")
         ip.run_cell_magic(
             "writefile",
             fname,
             "\n".join(
                 [
                     "line1",
                     "line2",
                 ]
             ),
         )
         s = Path(fname).read_text(encoding="utf-8")
         assert "line1\n" in s
         assert "line2" in s
 
 
 @dec.skip_win32
 def test_file_double_quote():
     """Basic %%writefile with embedded double quotes"""
     ip = get_ipython()
     with TemporaryDirectory() as td:
         fname = os.path.join(td, '"file1"')
         ip.run_cell_magic(
             "writefile",
             fname,
             "\n".join(
                 [
                     "line1",
                     "line2",
                 ]
             ),
         )
         s = Path(fname).read_text(encoding="utf-8")
         assert "line1\n" in s
         assert "line2" in s
 
 
 def test_file_var_expand():
     """%%writefile $filename"""
     ip = get_ipython()
     with TemporaryDirectory() as td:
         fname = os.path.join(td, "file1")
         ip.user_ns["filename"] = fname
         ip.run_cell_magic(
             "writefile",
             "$filename",
             "\n".join(
                 [
                     "line1",
                     "line2",
                 ]
             ),
         )
         s = Path(fname).read_text(encoding="utf-8")
         assert "line1\n" in s
         assert "line2" in s
 
 
 def test_file_unicode():
     """%%writefile with unicode cell"""
     ip = get_ipython()
     with TemporaryDirectory() as td:
         fname = os.path.join(td, 'file1')
         ip.run_cell_magic("writefile", fname, u'\n'.join([
             u'liné1',
             u'liné2',
         ]))
         with io.open(fname, encoding='utf-8') as f:
             s = f.read()
         assert "liné1\n" in s
         assert "liné2" in s
 
 
 def test_file_amend():
     """%%writefile -a amends files"""
     ip = get_ipython()
     with TemporaryDirectory() as td:
         fname = os.path.join(td, "file2")
         ip.run_cell_magic(
             "writefile",
             fname,
             "\n".join(
                 [
                     "line1",
                     "line2",
                 ]
             ),
         )
         ip.run_cell_magic(
             "writefile",
             "-a %s" % fname,
             "\n".join(
                 [
                     "line3",
                     "line4",
                 ]
             ),
         )
         s = Path(fname).read_text(encoding="utf-8")
         assert "line1\n" in s
         assert "line3\n" in s
 
 
 def test_file_spaces():
     """%%file with spaces in filename"""
     ip = get_ipython()
     with TemporaryWorkingDirectory() as td:
         fname = "file name"
         ip.run_cell_magic(
             "file",
             '"%s"' % fname,
             "\n".join(
                 [
                     "line1",
                     "line2",
                 ]
             ),
         )
         s = Path(fname).read_text(encoding="utf-8")
         assert "line1\n" in s
         assert "line2" in s
 
 
 def test_script_config():
     ip = get_ipython()
     ip.config.ScriptMagics.script_magics = ['whoda']
     sm = script.ScriptMagics(shell=ip)
     assert "whoda" in sm.magics["cell"]
 
 
 def test_script_out():
     ip = get_ipython()
     ip.run_cell_magic("script", f"--out output {sys.executable}", "print('hi')")
     assert ip.user_ns["output"].strip() == "hi"
 
 
 def test_script_err():
     ip = get_ipython()
     ip.run_cell_magic(
         "script",
         f"--err error {sys.executable}",
         "import sys; print('hello', file=sys.stderr)",
     )
     assert ip.user_ns["error"].strip() == "hello"
 
 
 def test_script_out_err():
 
     ip = get_ipython()
     ip.run_cell_magic(
         "script",
         f"--out output --err error {sys.executable}",
         "\n".join(
             [
                 "import sys",
                 "print('hi')",
                 "print('hello', file=sys.stderr)",
             ]
         ),
     )
     assert ip.user_ns["output"].strip() == "hi"
     assert ip.user_ns["error"].strip() == "hello"
 
 
 async def test_script_bg_out():
     ip = get_ipython()
     ip.run_cell_magic("script", f"--bg --out output {sys.executable}", "print('hi')")
     assert (await ip.user_ns["output"].read()).strip() == b"hi"
     assert ip.user_ns["output"].at_eof()
 
 
 async def test_script_bg_err():
     ip = get_ipython()
     ip.run_cell_magic(
         "script",
         f"--bg --err error {sys.executable}",
         "import sys; print('hello', file=sys.stderr)",
     )
     assert (await ip.user_ns["error"].read()).strip() == b"hello"
     assert ip.user_ns["error"].at_eof()
 
 
 async def test_script_bg_out_err():
     ip = get_ipython()
     ip.run_cell_magic(
         "script",
         f"--bg --out output --err error {sys.executable}",
         "\n".join(
             [
                 "import sys",
                 "print('hi')",
                 "print('hello', file=sys.stderr)",
             ]
         ),
     )
     assert (await ip.user_ns["output"].read()).strip() == b"hi"
     assert (await ip.user_ns["error"].read()).strip() == b"hello"
     assert ip.user_ns["output"].at_eof()
     assert ip.user_ns["error"].at_eof()
 
 
 async def test_script_bg_proc():
     ip = get_ipython()
     ip.run_cell_magic(
         "script",
         f"--bg --out output --proc p {sys.executable}",
         "\n".join(
             [
                 "import sys",
                 "print('hi')",
                 "print('hello', file=sys.stderr)",
             ]
         ),
     )
     p = ip.user_ns["p"]
     await p.wait()
     assert p.returncode == 0
     assert (await p.stdout.read()).strip() == b"hi"
     # not captured, so empty
     assert (await p.stderr.read()) == b""
     assert p.stdout.at_eof()
     assert p.stderr.at_eof()
 
 
 def test_script_defaults():
     ip = get_ipython()
     for cmd in ['sh', 'bash', 'perl', 'ruby']:
         try:
             find_cmd(cmd)
         except Exception:
             pass
         else:
             assert cmd in ip.magics_manager.magics["cell"]
 
 
 @magics_class
 class FooFoo(Magics):
     """class with both %foo and %%foo magics"""
     @line_magic('foo')
     def line_foo(self, line):
         "I am line foo"
         pass
 
     @cell_magic("foo")
     def cell_foo(self, line, cell):
         "I am cell foo, not line foo"
         pass
 
 def test_line_cell_info():
     """%%foo and %foo magics are distinguishable to inspect"""
     ip = get_ipython()
     ip.magics_manager.register(FooFoo)
     oinfo = ip.object_inspect("foo")
     assert oinfo["found"] is True
     assert oinfo["ismagic"] is True
 
     oinfo = ip.object_inspect("%%foo")
     assert oinfo["found"] is True
     assert oinfo["ismagic"] is True
     assert oinfo["docstring"] == FooFoo.cell_foo.__doc__
 
     oinfo = ip.object_inspect("%foo")
     assert oinfo["found"] is True
     assert oinfo["ismagic"] is True
     assert oinfo["docstring"] == FooFoo.line_foo.__doc__
 
 
 def test_multiple_magics():
     ip = get_ipython()
     foo1 = FooFoo(ip)
     foo2 = FooFoo(ip)
     mm = ip.magics_manager
     mm.register(foo1)
     assert mm.magics["line"]["foo"].__self__ is foo1
     mm.register(foo2)
     assert mm.magics["line"]["foo"].__self__ is foo2
 
 
 def test_alias_magic():
     """Test %alias_magic."""
     ip = get_ipython()
     mm = ip.magics_manager
 
     # Basic operation: both cell and line magics are created, if possible.
     ip.run_line_magic("alias_magic", "timeit_alias timeit")
     assert "timeit_alias" in mm.magics["line"]
     assert "timeit_alias" in mm.magics["cell"]
 
     # --cell is specified, line magic not created.
     ip.run_line_magic("alias_magic", "--cell timeit_cell_alias timeit")
     assert "timeit_cell_alias" not in mm.magics["line"]
     assert "timeit_cell_alias" in mm.magics["cell"]
 
     # Test that line alias is created successfully.
     ip.run_line_magic("alias_magic", "--line env_alias env")
     assert ip.run_line_magic("env", "") == ip.run_line_magic("env_alias", "")
 
     # Test that line alias with parameters passed in is created successfully.
     ip.run_line_magic(
         "alias_magic", "--line history_alias history --params " + shlex.quote("3")
     )
     assert "history_alias" in mm.magics["line"]
 
 
 def test_save():
     """Test %save."""
     ip = get_ipython()
     ip.history_manager.reset()   # Clear any existing history.
     cmds = ["a=1", "def b():\n  return a**2", "print(a, b())"]
     for i, cmd in enumerate(cmds, start=1):
         ip.history_manager.store_inputs(i, cmd)
     with TemporaryDirectory() as tmpdir:
         file = os.path.join(tmpdir, "testsave.py")
         ip.run_line_magic("save", "%s 1-10" % file)
         content = Path(file).read_text(encoding="utf-8")
         assert content.count(cmds[0]) == 1
         assert "coding: utf-8" in content
         ip.run_line_magic("save", "-a %s 1-10" % file)
         content = Path(file).read_text(encoding="utf-8")
         assert content.count(cmds[0]) == 2
         assert "coding: utf-8" in content
 
 
 def test_save_with_no_args():
     ip = get_ipython()
     ip.history_manager.reset()  # Clear any existing history.
     cmds = ["a=1", "def b():\n    return a**2", "print(a, b())", "%save"]
     for i, cmd in enumerate(cmds, start=1):
         ip.history_manager.store_inputs(i, cmd)
 
     with TemporaryDirectory() as tmpdir:
         path = os.path.join(tmpdir, "testsave.py")
         ip.run_line_magic("save", path)
         content = Path(path).read_text(encoding="utf-8")
         expected_content = dedent(
             """\
             # coding: utf-8
             a=1
             def b():
                 return a**2
             print(a, b())
             """
         )
         assert content == expected_content
 
 
 def test_store():
     """Test %store."""
     ip = get_ipython()
     ip.run_line_magic('load_ext', 'storemagic')
 
     # make sure the storage is empty
     ip.run_line_magic("store", "-z")
     ip.user_ns["var"] = 42
     ip.run_line_magic("store", "var")
     ip.user_ns["var"] = 39
     ip.run_line_magic("store", "-r")
     assert ip.user_ns["var"] == 42
 
     ip.run_line_magic("store", "-d var")
     ip.user_ns["var"] = 39
     ip.run_line_magic("store", "-r")
     assert ip.user_ns["var"] == 39
 
 
 def _run_edit_test(arg_s, exp_filename=None,
                         exp_lineno=-1,
                         exp_contents=None,
                         exp_is_temp=None):
     ip = get_ipython()
     M = code.CodeMagics(ip)
     last_call = ['','']
     opts,args = M.parse_options(arg_s,'prxn:')
     filename, lineno, is_temp = M._find_edit_target(ip, args, opts, last_call)
 
     if exp_filename is not None:
         assert exp_filename == filename
     if exp_contents is not None:
         with io.open(filename, 'r', encoding='utf-8') as f:
             contents = f.read()
         assert exp_contents == contents
     if exp_lineno != -1:
         assert exp_lineno == lineno
     if exp_is_temp is not None:
         assert exp_is_temp == is_temp
 
 
 def test_edit_interactive():
     """%edit on interactively defined objects"""
     ip = get_ipython()
     n = ip.execution_count
     ip.run_cell("def foo(): return 1", store_history=True)
 
     with pytest.raises(code.InteractivelyDefined) as e:
         _run_edit_test("foo")
     assert e.value.index == n
 
 
 def test_edit_cell():
     """%edit [cell id]"""
     ip = get_ipython()
 
     ip.run_cell("def foo(): return 1", store_history=True)
 
     # test
     _run_edit_test("1", exp_contents=ip.user_ns['In'][1], exp_is_temp=True)
 
 def test_edit_fname():
     """%edit file"""
     # test
     _run_edit_test("test file.py", exp_filename="test file.py")
 
 def test_bookmark():
     ip = get_ipython()
     ip.run_line_magic('bookmark', 'bmname')
     with tt.AssertPrints('bmname'):
         ip.run_line_magic('bookmark', '-l')
     ip.run_line_magic('bookmark', '-d bmname')
 
 def test_ls_magic():
     ip = get_ipython()
     json_formatter = ip.display_formatter.formatters['application/json']
     json_formatter.enabled = True
     lsmagic = ip.run_line_magic("lsmagic", "")
     with warnings.catch_warnings(record=True) as w:
         j = json_formatter(lsmagic)
     assert sorted(j) == ["cell", "line"]
     assert w == []  # no warnings
 
 
 def test_strip_initial_indent():
     def sii(s):
         lines = s.splitlines()
         return '\n'.join(code.strip_initial_indent(lines))
 
     assert sii("  a = 1\nb = 2") == "a = 1\nb = 2"
     assert sii("  a\n    b\nc") == "a\n  b\nc"
     assert sii("a\n  b") == "a\n  b"
 
 def test_logging_magic_quiet_from_arg():
     _ip.config.LoggingMagics.quiet = False
     lm = logging.LoggingMagics(shell=_ip)
     with TemporaryDirectory() as td:
         try:
             with tt.AssertNotPrints(re.compile("Activating.*")):
                 lm.logstart('-q {}'.format(
                         os.path.join(td, "quiet_from_arg.log")))
         finally:
             _ip.logger.logstop()
 
 def test_logging_magic_quiet_from_config():
     _ip.config.LoggingMagics.quiet = True
     lm = logging.LoggingMagics(shell=_ip)
     with TemporaryDirectory() as td:
         try:
             with tt.AssertNotPrints(re.compile("Activating.*")):
                 lm.logstart(os.path.join(td, "quiet_from_config.log"))
         finally:
             _ip.logger.logstop()
 
 
 def test_logging_magic_not_quiet():
     _ip.config.LoggingMagics.quiet = False
     lm = logging.LoggingMagics(shell=_ip)
     with TemporaryDirectory() as td:
         try:
             with tt.AssertPrints(re.compile("Activating.*")):
                 lm.logstart(os.path.join(td, "not_quiet.log"))
         finally:
             _ip.logger.logstop()
 
 
 def test_time_no_var_expand():
     _ip.user_ns["a"] = 5
     _ip.user_ns["b"] = []
     _ip.run_line_magic("time", 'b.append("{a}")')
     assert _ip.user_ns["b"] == ["{a}"]
 
 
 # this is slow, put at the end for local testing.
 def test_timeit_arguments():
     "Test valid timeit arguments, should not cause SyntaxError (GH #1269)"
     _ip.run_line_magic("timeit", "-n1 -r1 a=('#')")
 
 
 MINIMAL_LAZY_MAGIC = """
 from IPython.core.magic import (
     Magics,
     magics_class,
     line_magic,
     cell_magic,
 )
 
 
 @magics_class
 class LazyMagics(Magics):
     @line_magic
     def lazy_line(self, line):
         print("Lazy Line")
 
     @cell_magic
     def lazy_cell(self, line, cell):
         print("Lazy Cell")
 
 
 def load_ipython_extension(ipython):
     ipython.register_magics(LazyMagics)
 """
 
 
 def test_lazy_magics():
     with pytest.raises(UsageError):
         ip.run_line_magic("lazy_line", "")
 
     startdir = os.getcwd()
 
     with TemporaryDirectory() as tmpdir:
         with prepended_to_syspath(tmpdir):
             ptempdir = Path(tmpdir)
             tf = ptempdir / "lazy_magic_module.py"
             tf.write_text(MINIMAL_LAZY_MAGIC)
             ip.magics_manager.register_lazy("lazy_line", Path(tf.name).name[:-3])
             with tt.AssertPrints("Lazy Line"):
                 ip.run_line_magic("lazy_line", "")
 
 
 TEST_MODULE = """
 print('Loaded my_tmp')
 if __name__ == "__main__":
     print('I just ran a script')
 """
 
 def test_run_module_from_import_hook():
     "Test that a module can be loaded via an import hook"
     with TemporaryDirectory() as tmpdir:
         fullpath = os.path.join(tmpdir, "my_tmp.py")
         Path(fullpath).write_text(TEST_MODULE, encoding="utf-8")
 
         import importlib.abc
         import importlib.util
 
         class MyTempImporter(importlib.abc.MetaPathFinder, importlib.abc.SourceLoader):
             def find_spec(self, fullname, path, target=None):
                 if fullname == "my_tmp":
                     return importlib.util.spec_from_loader(fullname, self)
 
             def get_filename(self, fullname):
                 assert fullname == "my_tmp"
                 return fullpath
 
             def get_data(self, path):
                 assert Path(path).samefile(fullpath)
                 return Path(fullpath).read_text(encoding="utf-8")
 
         sys.meta_path.insert(0, MyTempImporter())
 
         with capture_output() as captured:
             _ip.run_line_magic("run", "-m my_tmp")
             _ip.run_cell("import my_tmp")
 
         output = "Loaded my_tmp\nI just ran a script\nLoaded my_tmp\n"
         assert output == captured.stdout
 
         sys.meta_path.pop(0)