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