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# testing/assertions.py
# Copyright (C) 2005-2016 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
# the MIT License: http://www.opensource.org/licenses/mit-license.php
from __future__ import absolute_import
from . import util as testutil
from sqlalchemy import pool, orm, util
from sqlalchemy.engine import default, url
from sqlalchemy.util import decorator
from sqlalchemy import types as sqltypes, schema, exc as sa_exc
import warnings
import re
from .exclusions import db_spec, _is_excluded
from . import assertsql
from . import config
from .util import fail
import contextlib
from . import mock
def expect_warnings(*messages, **kw):
"""Context manager which expects one or more warnings.
With no arguments, squelches all SAWarnings emitted via
sqlalchemy.util.warn and sqlalchemy.util.warn_limited. Otherwise
pass string expressions that will match selected warnings via regex;
all non-matching warnings are sent through.
The expect version **asserts** that the warnings were in fact seen.
Note that the test suite sets SAWarning warnings to raise exceptions.
"""
return _expect_warnings(sa_exc.SAWarning, messages, **kw)
@contextlib.contextmanager
def expect_warnings_on(db, *messages, **kw):
"""Context manager which expects one or more warnings on specific
dialects.
The expect version **asserts** that the warnings were in fact seen.
"""
spec = db_spec(db)
if isinstance(db, util.string_types) and not spec(config._current):
yield
else:
with expect_warnings(*messages, **kw):
yield
def emits_warning(*messages):
"""Decorator form of expect_warnings().
Note that emits_warning does **not** assert that the warnings
were in fact seen.
"""
@decorator
def decorate(fn, *args, **kw):
with expect_warnings(assert_=False, *messages):
return fn(*args, **kw)
return decorate
def expect_deprecated(*messages, **kw):
return _expect_warnings(sa_exc.SADeprecationWarning, messages, **kw)
def emits_warning_on(db, *messages):
"""Mark a test as emitting a warning on a specific dialect.
With no arguments, squelches all SAWarning failures. Or pass one or more
strings; these will be matched to the root of the warning description by
warnings.filterwarnings().
Note that emits_warning_on does **not** assert that the warnings
were in fact seen.
"""
@decorator
def decorate(fn, *args, **kw):
with expect_warnings_on(db, assert_=False, *messages):
return fn(*args, **kw)
return decorate
def uses_deprecated(*messages):
"""Mark a test as immune from fatal deprecation warnings.
With no arguments, squelches all SADeprecationWarning failures.
Or pass one or more strings; these will be matched to the root
of the warning description by warnings.filterwarnings().
As a special case, you may pass a function name prefixed with //
and it will be re-written as needed to match the standard warning
verbiage emitted by the sqlalchemy.util.deprecated decorator.
Note that uses_deprecated does **not** assert that the warnings
were in fact seen.
"""
@decorator
def decorate(fn, *args, **kw):
with expect_deprecated(*messages, assert_=False):
return fn(*args, **kw)
return decorate
@contextlib.contextmanager
def _expect_warnings(exc_cls, messages, regex=True, assert_=True):
if regex:
filters = [re.compile(msg, re.I | re.S) for msg in messages]
else:
filters = messages
seen = set(filters)
real_warn = warnings.warn
def our_warn(msg, exception, *arg, **kw):
if not issubclass(exception, exc_cls):
return real_warn(msg, exception, *arg, **kw)
if not filters:
return
for filter_ in filters:
if (regex and filter_.match(msg)) or \
(not regex and filter_ == msg):
seen.discard(filter_)
break
else:
real_warn(msg, exception, *arg, **kw)
with mock.patch("warnings.warn", our_warn):
yield
if assert_:
assert not seen, "Warnings were not seen: %s" % \
", ".join("%r" % (s.pattern if regex else s) for s in seen)
def global_cleanup_assertions():
"""Check things that have to be finalized at the end of a test suite.
Hardcoded at the moment, a modular system can be built here
to support things like PG prepared transactions, tables all
dropped, etc.
"""
_assert_no_stray_pool_connections()
_STRAY_CONNECTION_FAILURES = 0
def _assert_no_stray_pool_connections():
global _STRAY_CONNECTION_FAILURES
# lazy gc on cPython means "do nothing." pool connections
# shouldn't be in cycles, should go away.
testutil.lazy_gc()
# however, once in awhile, on an EC2 machine usually,
# there's a ref in there. usually just one.
if pool._refs:
# OK, let's be somewhat forgiving.
_STRAY_CONNECTION_FAILURES += 1
print("Encountered a stray connection in test cleanup: %s"
% str(pool._refs))
# then do a real GC sweep. We shouldn't even be here
# so a single sweep should really be doing it, otherwise
# there's probably a real unreachable cycle somewhere.
testutil.gc_collect()
# if we've already had two of these occurrences, or
# after a hard gc sweep we still have pool._refs?!
# now we have to raise.
if pool._refs:
err = str(pool._refs)
# but clean out the pool refs collection directly,
# reset the counter,
# so the error doesn't at least keep happening.
pool._refs.clear()
_STRAY_CONNECTION_FAILURES = 0
assert False, "Stray connection refused to leave "\
"after gc.collect(): %s" % err
elif _STRAY_CONNECTION_FAILURES > 10:
assert False, "Encountered more than 10 stray connections"
_STRAY_CONNECTION_FAILURES = 0
def eq_(a, b, msg=None):
"""Assert a == b, with repr messaging on failure."""
assert a == b, msg or "%r != %r" % (a, b)
def ne_(a, b, msg=None):
"""Assert a != b, with repr messaging on failure."""
assert a != b, msg or "%r == %r" % (a, b)
def le_(a, b, msg=None):
"""Assert a <= b, with repr messaging on failure."""
assert a <= b, msg or "%r != %r" % (a, b)
def is_(a, b, msg=None):
"""Assert a is b, with repr messaging on failure."""
assert a is b, msg or "%r is not %r" % (a, b)
def is_not_(a, b, msg=None):
"""Assert a is not b, with repr messaging on failure."""
assert a is not b, msg or "%r is %r" % (a, b)
def in_(a, b, msg=None):
"""Assert a in b, with repr messaging on failure."""
assert a in b, msg or "%r not in %r" % (a, b)
def not_in_(a, b, msg=None):
"""Assert a in not b, with repr messaging on failure."""
assert a not in b, msg or "%r is in %r" % (a, b)
def startswith_(a, fragment, msg=None):
"""Assert a.startswith(fragment), with repr messaging on failure."""
assert a.startswith(fragment), msg or "%r does not start with %r" % (
a, fragment)
def assert_raises(except_cls, callable_, *args, **kw):
try:
callable_(*args, **kw)
success = False
except except_cls:
success = True
# assert outside the block so it works for AssertionError too !
assert success, "Callable did not raise an exception"
def assert_raises_message(except_cls, msg, callable_, *args, **kwargs):
try:
callable_(*args, **kwargs)
assert False, "Callable did not raise an exception"
except except_cls as e:
assert re.search(
msg, util.text_type(e), re.UNICODE), "%r !~ %s" % (msg, e)
print(util.text_type(e).encode('utf-8'))
class AssertsCompiledSQL(object):
def assert_compile(self, clause, result, params=None,
checkparams=None, dialect=None,
checkpositional=None,
check_prefetch=None,
use_default_dialect=False,
allow_dialect_select=False,
literal_binds=False):
if use_default_dialect:
dialect = default.DefaultDialect()
elif allow_dialect_select:
dialect = None
else:
if dialect is None:
dialect = getattr(self, '__dialect__', None)
if dialect is None:
dialect = config.db.dialect
elif dialect == 'default':
dialect = default.DefaultDialect()
elif isinstance(dialect, util.string_types):
dialect = url.URL(dialect).get_dialect()()
kw = {}
compile_kwargs = {}
if params is not None:
kw['column_keys'] = list(params)
if literal_binds:
compile_kwargs['literal_binds'] = True
if isinstance(clause, orm.Query):
context = clause._compile_context()
context.statement.use_labels = True
clause = context.statement
if compile_kwargs:
kw['compile_kwargs'] = compile_kwargs
c = clause.compile(dialect=dialect, **kw)
param_str = repr(getattr(c, 'params', {}))
if util.py3k:
param_str = param_str.encode('utf-8').decode('ascii', 'ignore')
print(
("\nSQL String:\n" +
util.text_type(c) +
param_str).encode('utf-8'))
else:
print(
"\nSQL String:\n" +
util.text_type(c).encode('utf-8') +
param_str)
cc = re.sub(r'[\n\t]', '', util.text_type(c))
eq_(cc, result, "%r != %r on dialect %r" % (cc, result, dialect))
if checkparams is not None:
eq_(c.construct_params(params), checkparams)
if checkpositional is not None:
p = c.construct_params(params)
eq_(tuple([p[x] for x in c.positiontup]), checkpositional)
if check_prefetch is not None:
eq_(c.prefetch, check_prefetch)
class ComparesTables(object):
def assert_tables_equal(self, table, reflected_table, strict_types=False):
assert len(table.c) == len(reflected_table.c)
for c, reflected_c in zip(table.c, reflected_table.c):
eq_(c.name, reflected_c.name)
assert reflected_c is reflected_table.c[c.name]
eq_(c.primary_key, reflected_c.primary_key)
eq_(c.nullable, reflected_c.nullable)
if strict_types:
msg = "Type '%s' doesn't correspond to type '%s'"
assert isinstance(reflected_c.type, type(c.type)), \
msg % (reflected_c.type, c.type)
else:
self.assert_types_base(reflected_c, c)
if isinstance(c.type, sqltypes.String):
eq_(c.type.length, reflected_c.type.length)
eq_(
set([f.column.name for f in c.foreign_keys]),
set([f.column.name for f in reflected_c.foreign_keys])
)
if c.server_default:
assert isinstance(reflected_c.server_default,
schema.FetchedValue)
assert len(table.primary_key) == len(reflected_table.primary_key)
for c in table.primary_key:
assert reflected_table.primary_key.columns[c.name] is not None
def assert_types_base(self, c1, c2):
assert c1.type._compare_type_affinity(c2.type),\
"On column %r, type '%s' doesn't correspond to type '%s'" % \
(c1.name, c1.type, c2.type)
class AssertsExecutionResults(object):
def assert_result(self, result, class_, *objects):
result = list(result)
print(repr(result))
self.assert_list(result, class_, objects)
def assert_list(self, result, class_, list):
self.assert_(len(result) == len(list),
"result list is not the same size as test list, " +
"for class " + class_.__name__)
for i in range(0, len(list)):
self.assert_row(class_, result[i], list[i])
def assert_row(self, class_, rowobj, desc):
self.assert_(rowobj.__class__ is class_,
"item class is not " + repr(class_))
for key, value in desc.items():
if isinstance(value, tuple):
if isinstance(value[1], list):
self.assert_list(getattr(rowobj, key), value[0], value[1])
else:
self.assert_row(value[0], getattr(rowobj, key), value[1])
else:
self.assert_(getattr(rowobj, key) == value,
"attribute %s value %s does not match %s" % (
key, getattr(rowobj, key), value))
def assert_unordered_result(self, result, cls, *expected):
"""As assert_result, but the order of objects is not considered.
The algorithm is very expensive but not a big deal for the small
numbers of rows that the test suite manipulates.
"""
class immutabledict(dict):
def __hash__(self):
return id(self)
found = util.IdentitySet(result)
expected = set([immutabledict(e) for e in expected])
for wrong in util.itertools_filterfalse(lambda o:
isinstance(o, cls), found):
fail('Unexpected type "%s", expected "%s"' % (
type(wrong).__name__, cls.__name__))
if len(found) != len(expected):
fail('Unexpected object count "%s", expected "%s"' % (
len(found), len(expected)))
NOVALUE = object()
def _compare_item(obj, spec):
for key, value in spec.items():
if isinstance(value, tuple):
try:
self.assert_unordered_result(
getattr(obj, key), value[0], *value[1])
except AssertionError:
return False
else:
if getattr(obj, key, NOVALUE) != value:
return False
return True
for expected_item in expected:
for found_item in found:
if _compare_item(found_item, expected_item):
found.remove(found_item)
break
else:
fail(
"Expected %s instance with attributes %s not found." % (
cls.__name__, repr(expected_item)))
return True
def sql_execution_asserter(self, db=None):
if db is None:
from . import db as db
return assertsql.assert_engine(db)
def assert_sql_execution(self, db, callable_, *rules):
with self.sql_execution_asserter(db) as asserter:
callable_()
asserter.assert_(*rules)
def assert_sql(self, db, callable_, rules):
newrules = []
for rule in rules:
if isinstance(rule, dict):
newrule = assertsql.AllOf(*[
assertsql.CompiledSQL(k, v) for k, v in rule.items()
])
else:
newrule = assertsql.CompiledSQL(*rule)
newrules.append(newrule)
self.assert_sql_execution(db, callable_, *newrules)
def assert_sql_count(self, db, callable_, count):
self.assert_sql_execution(
db, callable_, assertsql.CountStatements(count))
@contextlib.contextmanager
def assert_execution(self, *rules):
assertsql.asserter.add_rules(rules)
try:
yield
assertsql.asserter.statement_complete()
finally:
assertsql.asserter.clear_rules()
def assert_statement_count(self, count):
return self.assert_execution(assertsql.CountStatements(count))
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