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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 signal
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import sys
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import time
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import warnings
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from tempfile import NamedTemporaryFile
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from subprocess import check_output, CalledProcessError, PIPE
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import subprocess
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from unittest.mock import patch
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import builtins
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import bdb
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import nose.tools as nt
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from IPython.core import debugger
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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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try:
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from reprlib import repr as trepr # Py 3
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except ImportError:
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from repr import repr as trepr # Py 2
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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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nt.assert_equal(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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nt.assert_equal(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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