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"""Tests for debugging machinery.
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"""
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# Copyright (c) IPython Development Team.
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# Distributed under the terms of the Modified BSD License.
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import bdb
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import builtins
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import os
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import signal
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import subprocess
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import sys
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import time
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import warnings
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from subprocess import PIPE, CalledProcessError, check_output
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from tempfile import NamedTemporaryFile
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from textwrap import dedent
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from unittest.mock import patch
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from IPython.core import debugger
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from IPython.testing import IPYTHON_TESTING_TIMEOUT_SCALE
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from IPython.testing.decorators import skip_win32
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#-----------------------------------------------------------------------------
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# Helper classes, from CPython's Pdb test suite
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#-----------------------------------------------------------------------------
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class _FakeInput(object):
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"""
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A fake input stream for pdb's interactive debugger. Whenever a
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line is read, print it (to simulate the user typing it), and then
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return it. The set of lines to return is specified in the
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constructor; they should not have trailing newlines.
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"""
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def __init__(self, lines):
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self.lines = iter(lines)
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def readline(self):
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line = next(self.lines)
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print(line)
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return line+'\n'
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class PdbTestInput(object):
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"""Context manager that makes testing Pdb in doctests easier."""
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def __init__(self, input):
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self.input = input
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def __enter__(self):
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self.real_stdin = sys.stdin
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sys.stdin = _FakeInput(self.input)
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def __exit__(self, *exc):
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sys.stdin = self.real_stdin
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#-----------------------------------------------------------------------------
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# Tests
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#-----------------------------------------------------------------------------
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def test_longer_repr():
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from reprlib import repr as trepr
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a = '1234567890'* 7
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ar = "'1234567890123456789012345678901234567890123456789012345678901234567890'"
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a_trunc = "'123456789012...8901234567890'"
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assert trepr(a) == a_trunc
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# The creation of our tracer modifies the repr module's repr function
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# in-place, since that global is used directly by the stdlib's pdb module.
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with warnings.catch_warnings():
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warnings.simplefilter('ignore', DeprecationWarning)
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debugger.Tracer()
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assert trepr(a) == ar
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def test_ipdb_magics():
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'''Test calling some IPython magics from ipdb.
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First, set up some test functions and classes which we can inspect.
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>>> class ExampleClass(object):
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... """Docstring for ExampleClass."""
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... def __init__(self):
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... """Docstring for ExampleClass.__init__"""
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... pass
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... def __str__(self):
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... return "ExampleClass()"
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>>> def example_function(x, y, z="hello"):
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... """Docstring for example_function."""
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... pass
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>>> old_trace = sys.gettrace()
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Create a function which triggers ipdb.
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>>> def trigger_ipdb():
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... a = ExampleClass()
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... debugger.Pdb().set_trace()
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>>> with PdbTestInput([
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... 'pdef example_function',
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... 'pdoc ExampleClass',
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... 'up',
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... 'down',
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... 'list',
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... 'pinfo a',
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... 'll',
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... 'continue',
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... ]):
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... trigger_ipdb()
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--Return--
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None
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> <doctest ...>(3)trigger_ipdb()
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1 def trigger_ipdb():
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2 a = ExampleClass()
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----> 3 debugger.Pdb().set_trace()
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<BLANKLINE>
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ipdb> pdef example_function
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example_function(x, y, z='hello')
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ipdb> pdoc ExampleClass
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Class docstring:
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Docstring for ExampleClass.
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Init docstring:
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Docstring for ExampleClass.__init__
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ipdb> up
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> <doctest ...>(11)<module>()
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7 'pinfo a',
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8 'll',
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9 'continue',
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10 ]):
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---> 11 trigger_ipdb()
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<BLANKLINE>
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ipdb> down
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None
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> <doctest ...>(3)trigger_ipdb()
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1 def trigger_ipdb():
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2 a = ExampleClass()
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----> 3 debugger.Pdb().set_trace()
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<BLANKLINE>
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ipdb> list
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1 def trigger_ipdb():
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2 a = ExampleClass()
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----> 3 debugger.Pdb().set_trace()
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<BLANKLINE>
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ipdb> pinfo a
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Type: ExampleClass
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String form: ExampleClass()
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Namespace: Local...
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Docstring: Docstring for ExampleClass.
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Init docstring: Docstring for ExampleClass.__init__
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ipdb> ll
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1 def trigger_ipdb():
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2 a = ExampleClass()
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----> 3 debugger.Pdb().set_trace()
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<BLANKLINE>
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ipdb> continue
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Restore previous trace function, e.g. for coverage.py
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>>> sys.settrace(old_trace)
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'''
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def test_ipdb_magics2():
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'''Test ipdb with a very short function.
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>>> old_trace = sys.gettrace()
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>>> def bar():
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... pass
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Run ipdb.
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>>> with PdbTestInput([
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... 'continue',
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... ]):
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... debugger.Pdb().runcall(bar)
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> <doctest ...>(2)bar()
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1 def bar():
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----> 2 pass
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<BLANKLINE>
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ipdb> continue
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Restore previous trace function, e.g. for coverage.py
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>>> sys.settrace(old_trace)
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'''
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def can_quit():
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'''Test that quit work in ipydb
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>>> old_trace = sys.gettrace()
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>>> def bar():
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... pass
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>>> with PdbTestInput([
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... 'quit',
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... ]):
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... debugger.Pdb().runcall(bar)
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> <doctest ...>(2)bar()
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1 def bar():
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----> 2 pass
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<BLANKLINE>
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ipdb> quit
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Restore previous trace function, e.g. for coverage.py
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>>> sys.settrace(old_trace)
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'''
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def can_exit():
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'''Test that quit work in ipydb
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>>> old_trace = sys.gettrace()
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>>> def bar():
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... pass
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>>> with PdbTestInput([
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... 'exit',
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... ]):
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... debugger.Pdb().runcall(bar)
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> <doctest ...>(2)bar()
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1 def bar():
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----> 2 pass
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<BLANKLINE>
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ipdb> exit
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Restore previous trace function, e.g. for coverage.py
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>>> sys.settrace(old_trace)
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'''
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def test_interruptible_core_debugger():
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"""The debugger can be interrupted.
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The presumption is there is some mechanism that causes a KeyboardInterrupt
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(this is implemented in ipykernel). We want to ensure the
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KeyboardInterrupt cause debugging to cease.
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"""
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def raising_input(msg="", called=[0]):
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called[0] += 1
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if called[0] == 1:
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raise KeyboardInterrupt()
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else:
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raise AssertionError("input() should only be called once!")
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with patch.object(builtins, "input", raising_input):
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debugger.InterruptiblePdb().set_trace()
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# The way this test will fail is by set_trace() never exiting,
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# resulting in a timeout by the test runner. The alternative
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# implementation would involve a subprocess, but that adds issues with
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# interrupting subprocesses that are rather complex, so it's simpler
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# just to do it this way.
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@skip_win32
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def test_xmode_skip():
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"""that xmode skip frames
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Not as a doctest as pytest does not run doctests.
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"""
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import pexpect
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env = os.environ.copy()
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env["IPY_TEST_SIMPLE_PROMPT"] = "1"
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child = pexpect.spawn(
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sys.executable, ["-m", "IPython", "--colors=nocolor"], env=env
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)
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child.timeout = 15 * IPYTHON_TESTING_TIMEOUT_SCALE
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child.expect("IPython")
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child.expect("\n")
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child.expect_exact("In [1]")
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block = dedent(
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"""
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def f():
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__tracebackhide__ = True
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g()
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def g():
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raise ValueError
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f()
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"""
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)
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for line in block.splitlines():
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child.sendline(line)
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child.expect_exact(line)
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child.expect_exact("skipping")
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block = dedent(
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"""
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def f():
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__tracebackhide__ = True
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g()
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def g():
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from IPython.core.debugger import set_trace
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set_trace()
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f()
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"""
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)
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for line in block.splitlines():
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child.sendline(line)
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child.expect_exact(line)
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child.expect("ipdb>")
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child.sendline("w")
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child.expect("hidden")
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child.expect("ipdb>")
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child.sendline("skip_hidden false")
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child.sendline("w")
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child.expect("__traceba")
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child.expect("ipdb>")
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child.close()
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skip_decorators_blocks = (
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"""
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def helpers_helper():
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pass # should not stop here except breakpoint
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""",
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"""
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def helper_1():
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helpers_helper() # should not stop here
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""",
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"""
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def helper_2():
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pass # should not stop here
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""",
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"""
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def pdb_skipped_decorator2(function):
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def wrapped_fn(*args, **kwargs):
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__debuggerskip__ = True
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helper_2()
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__debuggerskip__ = False
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result = function(*args, **kwargs)
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__debuggerskip__ = True
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helper_2()
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return result
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return wrapped_fn
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""",
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"""
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def pdb_skipped_decorator(function):
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def wrapped_fn(*args, **kwargs):
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__debuggerskip__ = True
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helper_1()
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__debuggerskip__ = False
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result = function(*args, **kwargs)
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__debuggerskip__ = True
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helper_2()
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return result
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return wrapped_fn
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""",
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"""
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@pdb_skipped_decorator
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@pdb_skipped_decorator2
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def bar(x, y):
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return x * y
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""",
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"""import IPython.terminal.debugger as ipdb""",
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"""
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def f():
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ipdb.set_trace()
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bar(3, 4)
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""",
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"""
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f()
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""",
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)
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def _decorator_skip_setup():
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import pexpect
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env = os.environ.copy()
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env["IPY_TEST_SIMPLE_PROMPT"] = "1"
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child = pexpect.spawn(
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sys.executable, ["-m", "IPython", "--colors=nocolor"], env=env
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)
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child.timeout = 5 * IPYTHON_TESTING_TIMEOUT_SCALE
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child.expect("IPython")
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child.expect("\n")
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dedented_blocks = [dedent(b).strip() for b in skip_decorators_blocks]
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in_prompt_number = 1
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for cblock in dedented_blocks:
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child.expect_exact(f"In [{in_prompt_number}]:")
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in_prompt_number += 1
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for line in cblock.splitlines():
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child.sendline(line)
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child.expect_exact(line)
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child.sendline("")
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return child
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@skip_win32
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def test_decorator_skip():
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"""test that decorator frames can be skipped."""
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child = _decorator_skip_setup()
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child.expect_exact("3 bar(3, 4)")
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child.expect("ipdb>")
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child.expect("ipdb>")
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child.sendline("step")
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child.expect_exact("step")
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child.expect_exact("1 @pdb_skipped_decorator")
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child.sendline("s")
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child.expect_exact("return x * y")
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child.close()
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@skip_win32
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def test_decorator_skip_disabled():
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"""test that decorator frame skipping can be disabled"""
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child = _decorator_skip_setup()
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child.expect_exact("3 bar(3, 4)")
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for input_, expected in [
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("skip_predicates debuggerskip False", ""),
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("skip_predicates", "debuggerskip : False"),
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("step", "---> 2 def wrapped_fn"),
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("step", "----> 3 __debuggerskip__"),
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("step", "----> 4 helper_1()"),
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("step", "---> 1 def helper_1():"),
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("next", "----> 2 helpers_helper()"),
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("next", "--Return--"),
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("next", "----> 5 __debuggerskip__ = False"),
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]:
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child.expect("ipdb>")
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child.sendline(input_)
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child.expect_exact(input_)
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child.expect_exact(expected)
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child.close()
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@skip_win32
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def test_decorator_skip_with_breakpoint():
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"""test that decorator frame skipping can be disabled"""
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import pexpect
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env = os.environ.copy()
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env["IPY_TEST_SIMPLE_PROMPT"] = "1"
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child = pexpect.spawn(
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sys.executable, ["-m", "IPython", "--colors=nocolor"], env=env
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)
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child.timeout = 5 * IPYTHON_TESTING_TIMEOUT_SCALE
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child.expect("IPython")
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child.expect("\n")
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### we need a filename, so we need to exec the full block with a filename
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with NamedTemporaryFile(suffix=".py", dir=".", delete=True) as tf:
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name = tf.name[:-3].split("/")[-1]
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tf.write("\n".join([dedent(x) for x in skip_decorators_blocks[:-1]]).encode())
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tf.flush()
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codeblock = f"from {name} import f"
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dedented_blocks = [
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codeblock,
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"f()",
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]
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in_prompt_number = 1
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for cblock in dedented_blocks:
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child.expect_exact(f"In [{in_prompt_number}]:")
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in_prompt_number += 1
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for line in cblock.splitlines():
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child.sendline(line)
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|
child.expect_exact(line)
|
|
|
child.sendline("")
|
|
|
|
|
|
# as the filename does not exists, we'll rely on the filename prompt
|
|
|
child.expect_exact("47 bar(3, 4)")
|
|
|
|
|
|
for input_, expected in [
|
|
|
(f"b {name}.py:3", ""),
|
|
|
("step", "1---> 3 pass # should not stop here except"),
|
|
|
("step", "---> 38 @pdb_skipped_decorator"),
|
|
|
("continue", ""),
|
|
|
]:
|
|
|
child.expect("ipdb>")
|
|
|
child.sendline(input_)
|
|
|
child.expect_exact(input_)
|
|
|
child.expect_exact(expected)
|
|
|
|
|
|
child.close()
|
|
|
|
|
|
|
|
|
@skip_win32
|
|
|
def test_where_erase_value():
|
|
|
"""Test that `where` does not access f_locals and erase values."""
|
|
|
import pexpect
|
|
|
|
|
|
env = os.environ.copy()
|
|
|
env["IPY_TEST_SIMPLE_PROMPT"] = "1"
|
|
|
|
|
|
child = pexpect.spawn(
|
|
|
sys.executable, ["-m", "IPython", "--colors=nocolor"], env=env
|
|
|
)
|
|
|
child.timeout = 15 * IPYTHON_TESTING_TIMEOUT_SCALE
|
|
|
|
|
|
child.expect("IPython")
|
|
|
child.expect("\n")
|
|
|
child.expect_exact("In [1]")
|
|
|
|
|
|
block = dedent(
|
|
|
"""
|
|
|
def simple_f():
|
|
|
myvar = 1
|
|
|
print(myvar)
|
|
|
1/0
|
|
|
print(myvar)
|
|
|
simple_f() """
|
|
|
)
|
|
|
|
|
|
for line in block.splitlines():
|
|
|
child.sendline(line)
|
|
|
child.expect_exact(line)
|
|
|
child.expect_exact("ZeroDivisionError")
|
|
|
child.expect_exact("In [2]:")
|
|
|
|
|
|
child.sendline("%debug")
|
|
|
|
|
|
##
|
|
|
child.expect("ipdb>")
|
|
|
|
|
|
child.sendline("myvar")
|
|
|
child.expect("1")
|
|
|
|
|
|
##
|
|
|
child.expect("ipdb>")
|
|
|
|
|
|
child.sendline("myvar = 2")
|
|
|
|
|
|
##
|
|
|
child.expect_exact("ipdb>")
|
|
|
|
|
|
child.sendline("myvar")
|
|
|
|
|
|
child.expect_exact("2")
|
|
|
|
|
|
##
|
|
|
child.expect("ipdb>")
|
|
|
child.sendline("where")
|
|
|
|
|
|
##
|
|
|
child.expect("ipdb>")
|
|
|
child.sendline("myvar")
|
|
|
|
|
|
child.expect_exact("2")
|
|
|
child.expect("ipdb>")
|
|
|
|
|
|
child.close()
|
|
|
|
