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# encoding: utf-8
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"""Tests for IPython.core.ultratb
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"""
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import io
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import logging
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import sys
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import os.path
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from textwrap import dedent
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import traceback
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import unittest
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from unittest import mock
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import IPython.core.ultratb as ultratb
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from IPython.core.ultratb import ColorTB, VerboseTB, find_recursion
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from IPython.testing import tools as tt
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from IPython.testing.decorators import onlyif_unicode_paths
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from IPython.utils.syspathcontext import prepended_to_syspath
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from IPython.utils.tempdir import TemporaryDirectory
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file_1 = """1
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2
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3
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def f():
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1/0
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"""
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file_2 = """def f():
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1/0
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"""
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def recursionlimit(frames):
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"""
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decorator to set the recursion limit temporarily
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"""
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def inner(test_function):
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def wrapper(*args, **kwargs):
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_orig_rec_limit = ultratb._FRAME_RECURSION_LIMIT
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ultratb._FRAME_RECURSION_LIMIT = 50
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rl = sys.getrecursionlimit()
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sys.setrecursionlimit(frames)
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try:
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return test_function(*args, **kwargs)
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finally:
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sys.setrecursionlimit(rl)
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ultratb._FRAME_RECURSION_LIMIT = _orig_rec_limit
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return wrapper
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return inner
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class ChangedPyFileTest(unittest.TestCase):
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def test_changing_py_file(self):
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"""Traceback produced if the line where the error occurred is missing?
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https://github.com/ipython/ipython/issues/1456
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"""
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with TemporaryDirectory() as td:
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fname = os.path.join(td, "foo.py")
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with open(fname, "w") as f:
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f.write(file_1)
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with prepended_to_syspath(td):
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ip.run_cell("import foo")
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with tt.AssertPrints("ZeroDivisionError"):
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ip.run_cell("foo.f()")
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# Make the file shorter, so the line of the error is missing.
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with open(fname, "w") as f:
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f.write(file_2)
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# For some reason, this was failing on the *second* call after
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# changing the file, so we call f() twice.
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with tt.AssertNotPrints("Internal Python error", channel='stderr'):
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with tt.AssertPrints("ZeroDivisionError"):
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ip.run_cell("foo.f()")
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with tt.AssertPrints("ZeroDivisionError"):
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ip.run_cell("foo.f()")
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iso_8859_5_file = u'''# coding: iso-8859-5
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def fail():
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"""дбИЖ"""
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1/0 # дбИЖ
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'''
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class NonAsciiTest(unittest.TestCase):
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@onlyif_unicode_paths
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def test_nonascii_path(self):
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# Non-ascii directory name as well.
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with TemporaryDirectory(suffix=u'é') as td:
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fname = os.path.join(td, u"fooé.py")
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with open(fname, "w") as f:
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f.write(file_1)
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with prepended_to_syspath(td):
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ip.run_cell("import foo")
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with tt.AssertPrints("ZeroDivisionError"):
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ip.run_cell("foo.f()")
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def test_iso8859_5(self):
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with TemporaryDirectory() as td:
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fname = os.path.join(td, 'dfghjkl.py')
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with io.open(fname, 'w', encoding='iso-8859-5') as f:
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f.write(iso_8859_5_file)
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with prepended_to_syspath(td):
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ip.run_cell("from dfghjkl import fail")
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with tt.AssertPrints("ZeroDivisionError"):
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with tt.AssertPrints(u'дбИЖ', suppress=False):
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ip.run_cell('fail()')
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def test_nonascii_msg(self):
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cell = u"raise Exception('é')"
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expected = u"Exception('é')"
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ip.run_cell("%xmode plain")
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with tt.AssertPrints(expected):
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ip.run_cell(cell)
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ip.run_cell("%xmode verbose")
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with tt.AssertPrints(expected):
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ip.run_cell(cell)
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ip.run_cell("%xmode context")
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with tt.AssertPrints(expected):
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ip.run_cell(cell)
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ip.run_cell("%xmode minimal")
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with tt.AssertPrints(u"Exception: é"):
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ip.run_cell(cell)
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# Put this back into Context mode for later tests.
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ip.run_cell("%xmode context")
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class NestedGenExprTestCase(unittest.TestCase):
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"""
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Regression test for the following issues:
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https://github.com/ipython/ipython/issues/8293
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https://github.com/ipython/ipython/issues/8205
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"""
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def test_nested_genexpr(self):
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code = dedent(
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"""\
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class SpecificException(Exception):
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pass
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def foo(x):
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raise SpecificException("Success!")
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sum(sum(foo(x) for _ in [0]) for x in [0])
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"""
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)
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with tt.AssertPrints('SpecificException: Success!', suppress=False):
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ip.run_cell(code)
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indentationerror_file = """if True:
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zoon()
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"""
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class IndentationErrorTest(unittest.TestCase):
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def test_indentationerror_shows_line(self):
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# See issue gh-2398
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with tt.AssertPrints("IndentationError"):
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with tt.AssertPrints("zoon()", suppress=False):
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ip.run_cell(indentationerror_file)
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with TemporaryDirectory() as td:
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fname = os.path.join(td, "foo.py")
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with open(fname, "w") as f:
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f.write(indentationerror_file)
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with tt.AssertPrints("IndentationError"):
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with tt.AssertPrints("zoon()", suppress=False):
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ip.magic('run %s' % fname)
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se_file_1 = """1
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2
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7/
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"""
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se_file_2 = """7/
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"""
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class SyntaxErrorTest(unittest.TestCase):
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def test_syntaxerror_without_lineno(self):
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with tt.AssertNotPrints("TypeError"):
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with tt.AssertPrints("line unknown"):
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ip.run_cell("raise SyntaxError()")
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def test_syntaxerror_no_stacktrace_at_compile_time(self):
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syntax_error_at_compile_time = """
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def foo():
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..
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"""
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with tt.AssertPrints("SyntaxError"):
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ip.run_cell(syntax_error_at_compile_time)
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with tt.AssertNotPrints("foo()"):
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ip.run_cell(syntax_error_at_compile_time)
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def test_syntaxerror_stacktrace_when_running_compiled_code(self):
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syntax_error_at_runtime = """
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def foo():
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eval("..")
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def bar():
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foo()
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bar()
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"""
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with tt.AssertPrints("SyntaxError"):
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ip.run_cell(syntax_error_at_runtime)
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# Assert syntax error during runtime generate stacktrace
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with tt.AssertPrints(["foo()", "bar()"]):
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ip.run_cell(syntax_error_at_runtime)
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del ip.user_ns['bar']
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del ip.user_ns['foo']
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def test_changing_py_file(self):
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with TemporaryDirectory() as td:
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fname = os.path.join(td, "foo.py")
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with open(fname, 'w') as f:
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f.write(se_file_1)
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with tt.AssertPrints(["7/", "SyntaxError"]):
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ip.magic("run " + fname)
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# Modify the file
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with open(fname, 'w') as f:
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f.write(se_file_2)
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# The SyntaxError should point to the correct line
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with tt.AssertPrints(["7/", "SyntaxError"]):
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ip.magic("run " + fname)
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def test_non_syntaxerror(self):
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# SyntaxTB may be called with an error other than a SyntaxError
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# See e.g. gh-4361
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try:
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raise ValueError('QWERTY')
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except ValueError:
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with tt.AssertPrints('QWERTY'):
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ip.showsyntaxerror()
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class Python3ChainedExceptionsTest(unittest.TestCase):
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DIRECT_CAUSE_ERROR_CODE = """
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try:
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x = 1 + 2
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print(not_defined_here)
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except Exception as e:
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x += 55
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x - 1
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y = {}
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raise KeyError('uh') from e
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"""
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EXCEPTION_DURING_HANDLING_CODE = """
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try:
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x = 1 + 2
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print(not_defined_here)
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except Exception as e:
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x += 55
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x - 1
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y = {}
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raise KeyError('uh')
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"""
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SUPPRESS_CHAINING_CODE = """
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try:
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1/0
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except Exception:
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raise ValueError("Yikes") from None
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"""
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def test_direct_cause_error(self):
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with tt.AssertPrints(["KeyError", "NameError", "direct cause"]):
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ip.run_cell(self.DIRECT_CAUSE_ERROR_CODE)
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def test_exception_during_handling_error(self):
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with tt.AssertPrints(["KeyError", "NameError", "During handling"]):
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ip.run_cell(self.EXCEPTION_DURING_HANDLING_CODE)
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def test_suppress_exception_chaining(self):
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with tt.AssertNotPrints("ZeroDivisionError"), \
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tt.AssertPrints("ValueError", suppress=False):
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ip.run_cell(self.SUPPRESS_CHAINING_CODE)
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class RecursionTest(unittest.TestCase):
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DEFINITIONS = """
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def non_recurs():
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1/0
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def r1():
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r1()
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def r3a():
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r3b()
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def r3b():
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r3c()
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def r3c():
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r3a()
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def r3o1():
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r3a()
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def r3o2():
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r3o1()
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"""
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def setUp(self):
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ip.run_cell(self.DEFINITIONS)
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def test_no_recursion(self):
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with tt.AssertNotPrints("frames repeated"):
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ip.run_cell("non_recurs()")
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@recursionlimit(150)
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def test_recursion_one_frame(self):
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with tt.AssertPrints("1 frames repeated"):
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ip.run_cell("r1()")
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@recursionlimit(150)
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def test_recursion_three_frames(self):
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with tt.AssertPrints("3 frames repeated"):
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ip.run_cell("r3o2()")
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@recursionlimit(150)
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def test_find_recursion(self):
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captured = []
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def capture_exc(*args, **kwargs):
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captured.append(sys.exc_info())
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with mock.patch.object(ip, 'showtraceback', capture_exc):
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ip.run_cell("r3o2()")
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self.assertEqual(len(captured), 1)
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etype, evalue, tb = captured[0]
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self.assertIn("recursion", str(evalue))
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records = ip.InteractiveTB.get_records(tb, 3, ip.InteractiveTB.tb_offset)
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for r in records[:10]:
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print(r[1:4])
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# The outermost frames should be:
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# 0: the 'cell' that was running when the exception came up
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# 1: r3o2()
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# 2: r3o1()
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# 3: r3a()
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# Then repeating r3b, r3c, r3a
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last_unique, repeat_length = find_recursion(etype, evalue, records)
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self.assertEqual(last_unique, 2)
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self.assertEqual(repeat_length, 3)
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#----------------------------------------------------------------------------
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# module testing (minimal)
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def test_handlers():
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def spam(c, d_e):
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(d, e) = d_e
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x = c + d
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y = c * d
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foo(x, y)
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def foo(a, b, bar=1):
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eggs(a, b + bar)
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def eggs(f, g, z=globals()):
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h = f + g
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i = f - g
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return h / i
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buff = io.StringIO()
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buff.write('')
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buff.write('*** Before ***')
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try:
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buff.write(spam(1, (2, 3)))
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except:
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traceback.print_exc(file=buff)
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handler = ColorTB(ostream=buff)
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buff.write('*** ColorTB ***')
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try:
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buff.write(spam(1, (2, 3)))
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except:
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handler(*sys.exc_info())
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buff.write('')
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handler = VerboseTB(ostream=buff)
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buff.write('*** VerboseTB ***')
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try:
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buff.write(spam(1, (2, 3)))
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except:
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handler(*sys.exc_info())
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buff.write('')
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from IPython.testing.decorators import skipif
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class TokenizeFailureTest(unittest.TestCase):
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"""Tests related to https://github.com/ipython/ipython/issues/6864."""
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# that appear to test that we are handling an exception that can be thrown
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# by the tokenizer due to a bug that seem to have been fixed in 3.8, though
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# I'm unsure if other sequences can make it raise this error. Let's just
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# skip in 3.8 for now
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@skipif(sys.version_info > (3,8))
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def testLogging(self):
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message = "An unexpected error occurred while tokenizing input"
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cell = 'raise ValueError("""a\nb""")'
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stream = io.StringIO()
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handler = logging.StreamHandler(stream)
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logger = logging.getLogger()
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loglevel = logger.level
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logger.addHandler(handler)
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self.addCleanup(lambda: logger.removeHandler(handler))
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self.addCleanup(lambda: logger.setLevel(loglevel))
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logger.setLevel(logging.INFO)
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with tt.AssertNotPrints(message):
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ip.run_cell(cell)
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self.assertNotIn(message, stream.getvalue())
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logger.setLevel(logging.DEBUG)
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with tt.AssertNotPrints(message):
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ip.run_cell(cell)
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self.assertIn(message, stream.getvalue())
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