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# -*- coding: utf-8 -*-
# preggy assertions
# https://github.com/heynemann/preggy
# Licensed under the MIT license:
# http://www.opensource.org/licenses/mit-license
# Copyright (c) 2013 Bernardo Heynemann heynemann@gmail.com
import six
import sys
from preggy import expect
def test_is_error():
topic = RuntimeError('Something Wrong')
expect(topic).to_be_an_error()
expect(topic).to_be_an_error_like(RuntimeError)
expect(topic).to_have_an_error_message_of('Something Wrong')
topic = ValueError('some bogus error')
expect(topic).to_be_an_error()
expect(topic).to_be_an_error_like(ValueError)
expect(topic).to_have_an_error_message_of('some bogus error')
def test_not_to_be_an_error():
NON_ERRORS = frozenset([
0,
2,
tuple(),
object(),
'b123a',
r'b123a',
six.u('b123a'),
b'b123a'
])
for item in NON_ERRORS:
expect(item).Not.to_be_an_error()
expect(item).not_to_be_an_error()
# try:
# expect(item).to_be_an_error()
# except AssertionError as err:
# expect(err).to_have_an_error_message_of("Expected topic({0}) to be an error".format(item))
def test_error_messages():
topic = Exception('1 does not equal 2')
expect(topic).to_have_an_error_message_of('1 does not equal 2')
try:
expect(topic).to_have_an_error_message_of('some bogus')
except AssertionError as err:
e_format = "Expected topic({0!r}) to be an error with message {1!r}"
e_values = six.text_type(topic), 'some bogus'
e_message = e_format.format(*e_values)
expect(err).to_have_an_error_message_of(e_message)
try:
expect(2).to_be_an_error()
except AssertionError as err:
expect(err).to_have_an_error_message_of('Expected topic(2) to be an error')
def test_to_be_an_error_like():
try:
expect(RuntimeError('Something Wrong')).to_be_an_error_like(ValueError)
except AssertionError:
return
assert False, 'Should not have gotten this far'
def test_not_to_be_an_error_like():
expect('Something Wrong').Not.to_be_an_error_like(ValueError)
def test_not_to_have_error_message():
try:
expect(RuntimeError('Something Wrong')).to_have_an_error_message_of('Something Else')
except AssertionError:
return
assert False, 'Should not have gotten this far'
def test_can_trap_errors():
err = expect.error_to_happen(RuntimeError)
with err:
raise RuntimeError("something is wrong")
expect(err).to_have_an_error_message_of('something is wrong')
with expect.error_to_happen(RuntimeError, message="something is wrong"):
raise RuntimeError("something is wrong")
def test_can_trap_errors_unicode():
err = expect.error_to_happen(RuntimeError)
with err:
raise RuntimeError(six.u("algo está errado"))
expect(err).to_have_an_error_message_of(six.u("algo está errado"))
with expect.error_to_happen(RuntimeError, message=six.u("algo está errado")):
raise RuntimeError(six.u("algo está errado"))
def test_can_trap_errors_fails_if_error_does_not_happen():
class_name = "%s.RuntimeError" % RuntimeError.__module__
err = expect.error_to_happen(RuntimeError)
try:
with err:
pass
except AssertionError:
error = sys.exc_info()[1]
expect(error).to_have_an_error_message_of(
'Expected "%s" to happen but no errors happened during execution of with block.' % class_name
)
else:
expect.not_to_be_here()
try:
with expect.error_to_happen(RuntimeError):
pass
except AssertionError:
error = sys.exc_info()[1]
expect(error).to_have_an_error_message_of(
'Expected "%s" to happen but no errors happened during execution of with block.' % class_name
)
else:
expect.not_to_be_here()
def test_can_trap_errors_fails_if_wrong_error():
class_name = "%s.RuntimeError" % RuntimeError.__module__
value_class_name = "%s.ValueError" % ValueError.__module__
err = expect.error_to_happen(RuntimeError)
try:
with err:
raise ValueError("something else entirely")
except AssertionError:
error = sys.exc_info()[1]
expect(error).to_have_an_error_message_of(
'Expected "%s" to happen but "%s" happened during execution of with block.' % (class_name, value_class_name)
)
else:
expect.not_to_be_here()
def test_can_trap_errors_fails_if_wrong_error_message():
class_name = "%s.ValueError" % ValueError.__module__
err = expect.error_to_happen(ValueError, message="Woot?")
try:
with err:
raise ValueError("something else entirely")
except AssertionError:
error = sys.exc_info()[1]
expect(error).to_have_an_error_message_of(
'Expected "%s" to have a message of "Woot?", but the actual error was "something else entirely".' % class_name
)
else:
expect.not_to_be_here()
def test_can_NOT_trap_errors():
try:
with expect.not_error_to_happen(RuntimeError):
raise RuntimeError("something is wrong")
except AssertionError:
err = sys.exc_info()[1]
expect(str(err)).to_include(
'not to happen but it happened during execution of with block.'
)
return
expect.not_to_be_here()
def test_can_trap_errors_but_fail_due_to_type():
try:
with expect.not_error_to_happen(RuntimeError):
raise ValueError("something is wrong")
except AssertionError:
err = sys.exc_info()[1]
expect(str(err)).to_include(
'ValueError" happened during execution of with block.'
)
return
expect.not_to_be_here()
def test_can_trap_errors_but_fail_due_to_message():
try:
with expect.not_error_to_happen(RuntimeError, message="qweqwe"):
raise RuntimeError("something is wrong")
except AssertionError:
err = sys.exc_info()[1]
expect(str(err)).to_include(
'to have a message of "qweqwe", but the actual error was "something is wrong".'
)
return
expect.not_to_be_here()
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