JezK
Edit File: assertions.py
# testing/assertions.py # Copyright (C) 2005-2023 the SQLAlchemy authors and contributors # <see AUTHORS file> # # This module is part of SQLAlchemy and is released under # the MIT License: https://www.opensource.org/licenses/mit-license.php from __future__ import absolute_import from collections import defaultdict import contextlib from copy import copy import re import sys import warnings from . import assertsql from . import config from . import engines from . import mock from .exclusions import db_spec from .util import fail from .. import exc as sa_exc from .. import schema from .. import sql from .. import types as sqltypes from .. import util from ..engine import default from ..engine import url from ..sql.selectable import LABEL_STYLE_TABLENAME_PLUS_COL from ..util import compat from ..util import decorator def expect_warnings(*messages, **kw): """Context manager which expects one or more warnings. With no arguments, squelches all SAWarning and RemovedIn20Warning 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. """ # noqa return _expect_warnings( (sa_exc.RemovedIn20Warning, 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 expect_deprecated_20(*messages, **kw): return _expect_warnings(sa_exc.Base20DeprecationWarning, 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 _FILTERS = None _SEEN = None _EXC_CLS = None @contextlib.contextmanager def _expect_warnings( exc_cls, messages, regex=True, search_msg=False, assert_=True, py2konly=False, raise_on_any_unexpected=False, squelch_other_warnings=False, ): global _FILTERS, _SEEN, _EXC_CLS if regex or search_msg: filters = [re.compile(msg, re.I | re.S) for msg in messages] else: filters = list(messages) if _FILTERS is not None: # nested call; update _FILTERS and _SEEN, return. outer # block will assert our messages assert _SEEN is not None assert _EXC_CLS is not None _FILTERS.extend(filters) _SEEN.update(filters) _EXC_CLS += (exc_cls,) yield else: seen = _SEEN = set(filters) _FILTERS = filters _EXC_CLS = (exc_cls,) if raise_on_any_unexpected: def real_warn(msg, *arg, **kw): raise AssertionError("Got unexpected warning: %r" % msg) else: real_warn = warnings.warn def our_warn(msg, *arg, **kw): if isinstance(msg, _EXC_CLS): exception = type(msg) msg = str(msg) elif arg: exception = arg[0] else: exception = None if not exception or not issubclass(exception, _EXC_CLS): if not squelch_other_warnings: return real_warn(msg, *arg, **kw) else: return if not filters and not raise_on_any_unexpected: return for filter_ in filters: if ( (search_msg and filter_.search(msg)) or (regex and filter_.match(msg)) or (not regex and filter_ == msg) ): seen.discard(filter_) break else: if not squelch_other_warnings: real_warn(msg, *arg, **kw) with mock.patch("warnings.warn", our_warn), mock.patch( "sqlalchemy.util.SQLALCHEMY_WARN_20", True ), mock.patch( "sqlalchemy.util.deprecations.SQLALCHEMY_WARN_20", True ), mock.patch( "sqlalchemy.engine.row.LegacyRow._default_key_style", 2 ): try: yield finally: _SEEN = _FILTERS = _EXC_CLS = None if assert_ and (not py2konly or not compat.py3k): 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() def _assert_no_stray_pool_connections(): engines.testing_reaper.assert_all_closed() def int_within_variance(expected, received, variance): deviance = int(expected * variance) assert ( abs(received - expected) < deviance ), "Given int value %s is not within %d%% of expected value %s" % ( received, variance * 100, expected, ) def eq_regex(a, b, msg=None): assert re.match(b, a), msg or "%r !~ %r" % (a, b) 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_instance_of(a, b, msg=None): assert isinstance(a, b), msg or "%r is not an instance of %r" % (a, b) def is_none(a, msg=None): is_(a, None, msg=msg) def is_not_none(a, msg=None): is_not(a, None, msg=msg) def is_true(a, msg=None): is_(bool(a), True, msg=msg) def is_false(a, msg=None): is_(bool(a), False, msg=msg) 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) # deprecated. See #5429 is_not_ = is_not 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) # deprecated. See #5429 not_in_ = not_in 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 eq_ignore_whitespace(a, b, msg=None): a = re.sub(r"^\s+?|\n", "", a) a = re.sub(r" {2,}", " ", a) b = re.sub(r"^\s+?|\n", "", b) b = re.sub(r" {2,}", " ", b) assert a == b, msg or "%r != %r" % (a, b) def _assert_proper_exception_context(exception): """assert that any exception we're catching does not have a __context__ without a __cause__, and that __suppress_context__ is never set. Python 3 will report nested as exceptions as "during the handling of error X, error Y occurred". That's not what we want to do. we want these exceptions in a cause chain. """ if not util.py3k: return if ( exception.__context__ is not exception.__cause__ and not exception.__suppress_context__ ): assert False, ( "Exception %r was correctly raised but did not set a cause, " "within context %r as its cause." % (exception, exception.__context__) ) def assert_raises(except_cls, callable_, *args, **kw): return _assert_raises(except_cls, callable_, args, kw, check_context=True) def assert_raises_context_ok(except_cls, callable_, *args, **kw): return _assert_raises(except_cls, callable_, args, kw) def assert_raises_message(except_cls, msg, callable_, *args, **kwargs): return _assert_raises( except_cls, callable_, args, kwargs, msg=msg, check_context=True ) def assert_warns(except_cls, callable_, *args, **kwargs): """legacy adapter function for functions that were previously using assert_raises with SAWarning or similar. has some workarounds to accommodate the fact that the callable completes with this approach rather than stopping at the exception raise. """ with _expect_warnings(except_cls, [".*"], squelch_other_warnings=True): return callable_(*args, **kwargs) def assert_warns_message(except_cls, msg, callable_, *args, **kwargs): """legacy adapter function for functions that were previously using assert_raises with SAWarning or similar. has some workarounds to accommodate the fact that the callable completes with this approach rather than stopping at the exception raise. Also uses regex.search() to match the given message to the error string rather than regex.match(). """ with _expect_warnings( except_cls, [msg], search_msg=True, regex=False, squelch_other_warnings=True, ): return callable_(*args, **kwargs) def assert_raises_message_context_ok( except_cls, msg, callable_, *args, **kwargs ): return _assert_raises(except_cls, callable_, args, kwargs, msg=msg) def _assert_raises( except_cls, callable_, args, kwargs, msg=None, check_context=False ): with _expect_raises(except_cls, msg, check_context) as ec: callable_(*args, **kwargs) return ec.error class _ErrorContainer(object): error = None @contextlib.contextmanager def _expect_raises(except_cls, msg=None, check_context=False): if ( isinstance(except_cls, type) and issubclass(except_cls, Warning) or isinstance(except_cls, Warning) ): raise TypeError( "Use expect_warnings for warnings, not " "expect_raises / assert_raises" ) ec = _ErrorContainer() if check_context: are_we_already_in_a_traceback = sys.exc_info()[0] try: yield ec success = False except except_cls as err: ec.error = err success = True if msg is not None: assert re.search( msg, util.text_type(err), re.UNICODE ), "%r !~ %s" % (msg, err) if check_context and not are_we_already_in_a_traceback: _assert_proper_exception_context(err) print(util.text_type(err).encode("utf-8")) # it's generally a good idea to not carry traceback objects outside # of the except: block, but in this case especially we seem to have # hit some bug in either python 3.10.0b2 or greenlet or both which # this seems to fix: # https://github.com/python-greenlet/greenlet/issues/242 del ec # assert outside the block so it works for AssertionError too ! assert success, "Callable did not raise an exception" def expect_raises(except_cls, check_context=True): return _expect_raises(except_cls, check_context=check_context) def expect_raises_message(except_cls, msg, check_context=True): return _expect_raises(except_cls, msg=msg, check_context=check_context) class AssertsCompiledSQL(object): def assert_compile( self, clause, result, params=None, checkparams=None, for_executemany=False, check_literal_execute=None, check_post_param=None, dialect=None, checkpositional=None, check_prefetch=None, use_default_dialect=False, allow_dialect_select=False, supports_default_values=True, supports_default_metavalue=True, literal_binds=False, render_postcompile=False, schema_translate_map=None, render_schema_translate=False, default_schema_name=None, from_linting=False, check_param_order=True, ): if use_default_dialect: dialect = default.DefaultDialect() dialect.supports_default_values = supports_default_values dialect.supports_default_metavalue = supports_default_metavalue 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" or dialect == "default_qmark": if dialect == "default": dialect = default.DefaultDialect() else: dialect = default.DefaultDialect(paramstyle="qmark") dialect.supports_default_values = supports_default_values dialect.supports_default_metavalue = supports_default_metavalue elif dialect == "default_enhanced": dialect = default.StrCompileDialect() elif isinstance(dialect, util.string_types): dialect = url.URL.create(dialect).get_dialect()() if default_schema_name: dialect.default_schema_name = default_schema_name kw = {} compile_kwargs = {} if schema_translate_map: kw["schema_translate_map"] = schema_translate_map if params is not None: kw["column_keys"] = list(params) if literal_binds: compile_kwargs["literal_binds"] = True if render_postcompile: compile_kwargs["render_postcompile"] = True if for_executemany: kw["for_executemany"] = True if render_schema_translate: kw["render_schema_translate"] = True if from_linting or getattr(self, "assert_from_linting", False): kw["linting"] = sql.FROM_LINTING from sqlalchemy import orm if isinstance(clause, orm.Query): stmt = clause._statement_20() stmt._label_style = LABEL_STYLE_TABLENAME_PLUS_COL clause = stmt if compile_kwargs: kw["compile_kwargs"] = compile_kwargs class DontAccess(object): def __getattribute__(self, key): raise NotImplementedError( "compiler accessed .statement; use " "compiler.current_executable" ) class CheckCompilerAccess(object): def __init__(self, test_statement): self.test_statement = test_statement self._annotations = {} self.supports_execution = getattr( test_statement, "supports_execution", False ) if self.supports_execution: self._execution_options = test_statement._execution_options if hasattr(test_statement, "_returning"): self._returning = test_statement._returning if hasattr(test_statement, "_inline"): self._inline = test_statement._inline if hasattr(test_statement, "_return_defaults"): self._return_defaults = test_statement._return_defaults def _default_dialect(self): return self.test_statement._default_dialect() def compile(self, dialect, **kw): return self.test_statement.compile.__func__( self, dialect=dialect, **kw ) def _compiler(self, dialect, **kw): return self.test_statement._compiler.__func__( self, dialect, **kw ) def _compiler_dispatch(self, compiler, **kwargs): if hasattr(compiler, "statement"): with mock.patch.object( compiler, "statement", DontAccess() ): return self.test_statement._compiler_dispatch( compiler, **kwargs ) else: return self.test_statement._compiler_dispatch( compiler, **kwargs ) # no construct can assume it's the "top level" construct in all cases # as anything can be nested. ensure constructs don't assume they # are the "self.statement" element c = CheckCompilerAccess(clause).compile(dialect=dialect, **kw) if isinstance(clause, sqltypes.TypeEngine): cache_key_no_warnings = clause._static_cache_key if cache_key_no_warnings: hash(cache_key_no_warnings) else: cache_key_no_warnings = clause._generate_cache_key() if cache_key_no_warnings: hash(cache_key_no_warnings[0]) 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, escape_names=False) eq_(tuple([p[x] for x in c.positiontup]), checkpositional) if check_prefetch is not None: eq_(c.prefetch, check_prefetch) if check_literal_execute is not None: eq_( { c.bind_names[b]: b.effective_value for b in c.literal_execute_params }, check_literal_execute, ) if check_post_param is not None: eq_( { c.bind_names[b]: b.effective_value for b in c.post_compile_params }, check_post_param, ) if check_param_order and getattr(c, "params", None): def get_dialect(paramstyle, positional): cp = copy(dialect) cp.paramstyle = paramstyle cp.positional = positional return cp pyformat_dialect = get_dialect("pyformat", False) pyformat_c = clause.compile(dialect=pyformat_dialect, **kw) stmt = re.sub(r"[\n\t]", "", pyformat_c.string) qmark_dialect = get_dialect("qmark", True) qmark_c = clause.compile(dialect=qmark_dialect, **kw) values = list(qmark_c.positiontup) escaped = qmark_c.escaped_bind_names for post_param in ( qmark_c.post_compile_params | qmark_c.literal_execute_params ): name = qmark_c.bind_names[post_param] if name in values: values = [v for v in values if v != name] positions = [] pos_by_value = defaultdict(list) for v in values: try: if v in pos_by_value: start = pos_by_value[v][-1] else: start = 0 esc = escaped.get(v, v) pos = stmt.index("%%(%s)s" % (esc,), start) + 2 positions.append(pos) pos_by_value[v].append(pos) except ValueError: msg = "Expected to find bindparam %r in %r" % (v, stmt) assert False, msg ordered = all( positions[i - 1] < positions[i] for i in range(1, len(positions)) ) expected = [v for _, v in sorted(zip(positions, values))] msg = ( "Order of parameters %s does not match the order " "in the statement %s. Statement %r" % (values, expected, stmt) ) is_true(ordered, msg) 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_( {f.column.name for f in c.foreign_keys}, {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 = {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: result = callable_() asserter.assert_(*rules) return result 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) return self.assert_sql_execution(db, callable_, *newrules) def assert_sql_count(self, db, callable_, count): self.assert_sql_execution( db, callable_, assertsql.CountStatements(count) ) def assert_multiple_sql_count(self, dbs, callable_, counts): recs = [ (self.sql_execution_asserter(db), db, count) for (db, count) in zip(dbs, counts) ] asserters = [] for ctx, db, count in recs: asserters.append(ctx.__enter__()) try: return callable_() finally: for asserter, (ctx, db, count) in zip(asserters, recs): ctx.__exit__(None, None, None) asserter.assert_(assertsql.CountStatements(count)) @contextlib.contextmanager def assert_execution(self, db, *rules): with self.sql_execution_asserter(db) as asserter: yield asserter.assert_(*rules) def assert_statement_count(self, db, count): return self.assert_execution(db, assertsql.CountStatements(count))