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test_pretty.py
183 lines | 4.9 KiB | text/x-python | PythonLexer
"""Tests for IPython.lib.pretty.
"""
#-----------------------------------------------------------------------------
# Copyright (c) 2011, the IPython Development Team.
#
# Distributed under the terms of the Modified BSD License.
#
# The full license is in the file COPYING.txt, distributed with this software.
#-----------------------------------------------------------------------------
#-----------------------------------------------------------------------------
# Imports
#-----------------------------------------------------------------------------
from __future__ import print_function
# Third-party imports
import nose.tools as nt
# Our own imports
from IPython.lib import pretty
from IPython.testing.decorators import skip_without
#-----------------------------------------------------------------------------
# Classes and functions
#-----------------------------------------------------------------------------
class MyList(object):
def __init__(self, content):
self.content = content
def _repr_pretty_(self, p, cycle):
if cycle:
p.text("MyList(...)")
else:
with p.group(3, "MyList(", ")"):
for (i, child) in enumerate(self.content):
if i:
p.text(",")
p.breakable()
else:
p.breakable("")
p.pretty(child)
class MyDict(dict):
def _repr_pretty_(self, p, cycle):
p.text("MyDict(...)")
class Dummy1(object):
def _repr_pretty_(self, p, cycle):
p.text("Dummy1(...)")
class Dummy2(Dummy1):
_repr_pretty_ = None
class NoModule(object):
pass
NoModule.__module__ = None
class Breaking(object):
def _repr_pretty_(self, p, cycle):
with p.group(4,"TG: ",":"):
p.text("Breaking(")
p.break_()
p.text(")")
class BreakingRepr(object):
def __repr__(self):
return "Breaking(\n)"
class BreakingReprParent(object):
def _repr_pretty_(self, p, cycle):
with p.group(4,"TG: ",":"):
p.pretty(BreakingRepr())
class BadRepr(object):
def __repr__(self):
return 1/0
def test_indentation():
"""Test correct indentation in groups"""
count = 40
gotoutput = pretty.pretty(MyList(range(count)))
expectedoutput = "MyList(\n" + ",\n".join(" %d" % i for i in range(count)) + ")"
nt.assert_equal(gotoutput, expectedoutput)
def test_dispatch():
"""
Test correct dispatching: The _repr_pretty_ method for MyDict
must be found before the registered printer for dict.
"""
gotoutput = pretty.pretty(MyDict())
expectedoutput = "MyDict(...)"
nt.assert_equal(gotoutput, expectedoutput)
def test_callability_checking():
"""
Test that the _repr_pretty_ method is tested for callability and skipped if
not.
"""
gotoutput = pretty.pretty(Dummy2())
expectedoutput = "Dummy1(...)"
nt.assert_equal(gotoutput, expectedoutput)
def test_sets():
"""
Test that set and frozenset use Python 3 formatting.
"""
objects = [set(), frozenset(), set([1]), frozenset([1]), set([1, 2]),
frozenset([1, 2]), set([-1, -2, -3])]
expected = ['set()', 'frozenset()', '{1}', 'frozenset({1})', '{1, 2}',
'frozenset({1, 2})', '{-3, -2, -1}']
for obj, expected_output in zip(objects, expected):
got_output = pretty.pretty(obj)
yield nt.assert_equal, got_output, expected_output
@skip_without('xxlimited')
def test_pprint_heap_allocated_type():
"""
Test that pprint works for heap allocated types.
"""
import xxlimited
output = pretty.pretty(xxlimited.Null)
nt.assert_equal(output, 'xxlimited.Null')
def test_pprint_nomod():
"""
Test that pprint works for classes with no __module__.
"""
output = pretty.pretty(NoModule)
nt.assert_equal(output, 'NoModule')
def test_pprint_break():
"""
Test that p.break_ produces expected output
"""
output = pretty.pretty(Breaking())
expected = "TG: Breaking(\n ):"
nt.assert_equal(output, expected)
def test_pprint_break_repr():
"""
Test that p.break_ is used in repr
"""
output = pretty.pretty(BreakingReprParent())
expected = "TG: Breaking(\n ):"
nt.assert_equal(output, expected)
def test_bad_repr():
"""Don't raise, even when repr fails"""
output = pretty.pretty(BadRepr())
nt.assert_in("failed", output)
nt.assert_in("at 0x", output)
nt.assert_in("test_pretty", output)
class BadException(Exception):
def __str__(self):
return -1
class ReallyBadRepr(object):
__module__ = 1
@property
def __class__(self):
raise ValueError("I am horrible")
def __repr__(self):
raise BadException()
def test_really_bad_repr():
output = pretty.pretty(ReallyBadRepr())
nt.assert_in("failed", output)
nt.assert_in("BadException: unknown", output)
nt.assert_in("unknown type", output)