forked from materialsvirtuallab/monty
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test_functools.py
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test_functools.py
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import platform
import sys
import time
import unittest
from monty.functools import (
TimeoutError,
lazy_property,
lru_cache,
prof_main,
return_if_raise,
return_none_if_raise,
timeout,
)
class TestLRUCache(unittest.TestCase):
def test_function(self):
@lru_cache(2, typed=True)
def cached_func(a, b, c=3):
return a + b + c
# call a few times to get some stats
self.assertEqual(cached_func(1, 2, c=4), 7)
self.assertEqual(cached_func(3, 2), 8)
self.assertEqual(cached_func(3, 2), 8)
self.assertEqual(cached_func(1, 2, c=4), 7)
self.assertEqual(cached_func(4, 2), 9)
self.assertEqual(cached_func(4, 2), 9)
self.assertEqual(cached_func(3, 2), 8)
self.assertEqual(cached_func(1, 2), 6)
self.assertEqual(cached_func.cache_info().hits, 3)
self.assertEqual(cached_func.cache_info().misses, 5)
def test_class_method(self):
class TestClass:
@lru_cache(10)
def cached_func(self, x):
return x
a = TestClass()
b = TestClass()
self.assertEqual(a.cached_func(1), 1)
self.assertEqual(b.cached_func(2), 2)
self.assertEqual(b.cached_func(3), 3)
self.assertEqual(a.cached_func(3), 3)
self.assertEqual(a.cached_func(1), 1)
self.assertEqual(a.cached_func.cache_info().hits, 1)
self.assertEqual(a.cached_func.cache_info().misses, 4)
class TestClass2:
@lru_cache(None)
def cached_func(self, x):
return x
a = TestClass2()
b = TestClass2()
self.assertEqual(a.cached_func(1), 1)
self.assertEqual(b.cached_func(2), 2)
self.assertEqual(b.cached_func(3), 3)
self.assertEqual(a.cached_func(3), 3)
self.assertEqual(a.cached_func(1), 1)
self.assertEqual(a.cached_func.cache_info().hits, 1)
self.assertEqual(a.cached_func.cache_info().misses, 4)
class TestCase(unittest.TestCase):
def assertException(self, exc_cls, pattern, func, *args, **kw):
"""Assert an exception of type 'exc_cls' is raised and
'pattern' is contained in the exception message.
"""
try:
func(*args, **kw)
except exc_cls as e:
exc_str = str(e)
else:
self.fail(f"{exc_cls.__name__} not raised")
if pattern not in exc_str:
self.fail(f"{pattern!r} not in {exc_str!r}")
class LazyTests(TestCase):
def test_evaluate(self):
# Lazy attributes should be evaluated when accessed.
called = []
class Foo:
@lazy_property
def foo(self):
called.append("foo")
return 1
f = Foo()
self.assertEqual(f.foo, 1)
self.assertEqual(len(called), 1)
def test_evaluate_once(self):
# lazy_property attributes should be evaluated only once.
called = []
class Foo:
@lazy_property
def foo(self):
called.append("foo")
return 1
f = Foo()
self.assertEqual(f.foo, 1)
self.assertEqual(f.foo, 1)
self.assertEqual(f.foo, 1)
self.assertEqual(len(called), 1)
def test_private_attribute(self):
# It should be possible to create private, name-mangled
# lazy_property attributes.
called = []
class Foo:
@lazy_property
def __foo(self):
called.append("foo")
return 1
def get_foo(self):
return self.__foo
f = Foo()
self.assertEqual(f.get_foo(), 1)
self.assertEqual(f.get_foo(), 1)
self.assertEqual(f.get_foo(), 1)
self.assertEqual(len(called), 1)
def test_reserved_attribute(self):
# It should be possible to create reserved lazy_property attributes.
called = []
class Foo:
@lazy_property
def __foo__(self):
called.append("foo")
return 1
f = Foo()
self.assertEqual(f.__foo__, 1)
self.assertEqual(f.__foo__, 1)
self.assertEqual(f.__foo__, 1)
self.assertEqual(len(called), 1)
def test_result_shadows_descriptor(self):
# The result of the function call should be stored in
# the object __dict__, shadowing the descriptor.
called = []
class Foo:
@lazy_property
def foo(self):
called.append("foo")
return 1
f = Foo()
self.assertTrue(isinstance(Foo.foo, lazy_property))
self.assertTrue(f.foo is f.foo)
self.assertTrue(f.foo is f.__dict__["foo"]) # !
self.assertEqual(len(called), 1)
self.assertEqual(f.foo, 1)
self.assertEqual(f.foo, 1)
self.assertEqual(len(called), 1)
lazy_property.invalidate(f, "foo")
self.assertEqual(f.foo, 1)
self.assertEqual(len(called), 2)
self.assertEqual(f.foo, 1)
self.assertEqual(f.foo, 1)
self.assertEqual(len(called), 2)
def test_readonly_object(self):
# The descriptor should raise an AttributeError when lazy_property is
# used on a read-only object (an object with __slots__).
called = []
class Foo:
__slots__ = ()
@lazy_property
def foo(self):
called.append("foo")
return 1
f = Foo()
self.assertEqual(len(called), 0)
self.assertException(
AttributeError,
"'Foo' object has no attribute '__dict__'",
getattr,
f,
"foo",
)
# The function was not called
self.assertEqual(len(called), 0)
def test_introspection(self):
# The lazy_property decorator should support basic introspection.
class Foo:
def foo(self):
"""foo func doc"""
@lazy_property
def bar(self):
"""bar func doc"""
self.assertEqual(Foo.foo.__name__, "foo")
self.assertEqual(Foo.foo.__doc__, "foo func doc")
self.assertIn("test_functools", Foo.foo.__module__)
self.assertEqual(Foo.bar.__name__, "bar")
self.assertEqual(Foo.bar.__doc__, "bar func doc")
self.assertIn("test_functools", Foo.bar.__module__)
class InvalidateTests(TestCase):
def test_invalidate_attribute(self):
# It should be possible to invalidate a lazy_property attribute.
called = []
class Foo:
@lazy_property
def foo(self):
called.append("foo")
return 1
f = Foo()
self.assertEqual(f.foo, 1)
self.assertEqual(len(called), 1)
lazy_property.invalidate(f, "foo")
self.assertEqual(f.foo, 1)
self.assertEqual(len(called), 2)
def test_invalidate_attribute_twice(self):
# It should be possible to invalidate a lazy_property attribute
# twice without causing harm.
called = []
class Foo:
@lazy_property
def foo(self):
called.append("foo")
return 1
f = Foo()
self.assertEqual(f.foo, 1)
self.assertEqual(len(called), 1)
lazy_property.invalidate(f, "foo")
lazy_property.invalidate(f, "foo") # Nothing happens
self.assertEqual(f.foo, 1)
self.assertEqual(len(called), 2)
def test_invalidate_uncalled_attribute(self):
# It should be possible to invalidate an empty attribute
# cache without causing harm.
called = []
class Foo:
@lazy_property
def foo(self):
called.append("foo")
return 1
f = Foo()
self.assertEqual(len(called), 0)
lazy_property.invalidate(f, "foo") # Nothing happens
def test_invalidate_private_attribute(self):
# It should be possible to invalidate a private lazy_property attribute.
called = []
class Foo:
@lazy_property
def __foo(self):
called.append("foo")
return 1
def get_foo(self):
return self.__foo
f = Foo()
self.assertEqual(f.get_foo(), 1)
self.assertEqual(len(called), 1)
lazy_property.invalidate(f, "__foo")
self.assertEqual(f.get_foo(), 1)
self.assertEqual(len(called), 2)
def test_invalidate_mangled_attribute(self):
# It should be possible to invalidate a private lazy_property attribute
# by its mangled name.
called = []
class Foo:
@lazy_property
def __foo(self):
called.append("foo")
return 1
def get_foo(self):
return self.__foo
f = Foo()
self.assertEqual(f.get_foo(), 1)
self.assertEqual(len(called), 1)
lazy_property.invalidate(f, "_Foo__foo")
self.assertEqual(f.get_foo(), 1)
self.assertEqual(len(called), 2)
def test_invalidate_reserved_attribute(self):
# It should be possible to invalidate a reserved lazy_property attribute.
called = []
class Foo:
@lazy_property
def __foo__(self):
called.append("foo")
return 1
f = Foo()
self.assertEqual(f.__foo__, 1)
self.assertEqual(len(called), 1)
lazy_property.invalidate(f, "__foo__")
self.assertEqual(f.__foo__, 1)
self.assertEqual(len(called), 2)
def test_invalidate_nonlazy_attribute(self):
# Invalidating an attribute that is not lazy_property should
# raise an AttributeError.
called = []
class Foo:
def foo(self):
called.append("foo")
return 1
f = Foo()
self.assertException(
AttributeError,
"'Foo.foo' is not a lazy_property attribute",
lazy_property.invalidate,
f,
"foo",
)
def test_invalidate_nonlazy_private_attribute(self):
# Invalidating a private attribute that is not lazy_property should
# raise an AttributeError.
called = []
class Foo:
def __foo(self):
called.append("foo")
return 1
f = Foo()
self.assertException(
AttributeError,
"'Foo._Foo__foo' is not a lazy_property attribute",
lazy_property.invalidate,
f,
"__foo",
)
def test_invalidate_unknown_attribute(self):
# Invalidating an unknown attribute should
# raise an AttributeError.
called = []
class Foo:
@lazy_property
def foo(self):
called.append("foo")
return 1
f = Foo()
self.assertException(
AttributeError,
"type object 'Foo' has no attribute 'bar'",
lazy_property.invalidate,
f,
"bar",
)
def test_invalidate_readonly_object(self):
# Calling invalidate on a read-only object should
# raise an AttributeError.
called = []
class Foo:
__slots__ = ()
@lazy_property
def foo(self):
called.append("foo")
return 1
f = Foo()
self.assertException(
AttributeError,
"'Foo' object has no attribute '__dict__'",
lazy_property.invalidate,
f,
"foo",
)
# A lazy_property subclass
class cached(lazy_property):
pass
class InvalidateSubclassTests(TestCase):
def test_invalidate_attribute(self):
# It should be possible to invalidate a cached attribute.
called = []
class Bar:
@cached
def bar(self):
called.append("bar")
return 1
b = Bar()
self.assertEqual(b.bar, 1)
self.assertEqual(len(called), 1)
cached.invalidate(b, "bar")
self.assertEqual(b.bar, 1)
self.assertEqual(len(called), 2)
def test_invalidate_attribute_twice(self):
# It should be possible to invalidate a cached attribute
# twice without causing harm.
called = []
class Bar:
@cached
def bar(self):
called.append("bar")
return 1
b = Bar()
self.assertEqual(b.bar, 1)
self.assertEqual(len(called), 1)
cached.invalidate(b, "bar")
cached.invalidate(b, "bar") # Nothing happens
self.assertEqual(b.bar, 1)
self.assertEqual(len(called), 2)
def test_invalidate_uncalled_attribute(self):
# It should be possible to invalidate an empty attribute
# cache without causing harm.
called = []
class Bar:
@cached
def bar(self):
called.append("bar")
return 1
b = Bar()
self.assertEqual(len(called), 0)
cached.invalidate(b, "bar") # Nothing happens
def test_invalidate_private_attribute(self):
# It should be possible to invalidate a private cached attribute.
called = []
class Bar:
@cached
def __bar(self):
called.append("bar")
return 1
def get_bar(self):
return self.__bar
b = Bar()
self.assertEqual(b.get_bar(), 1)
self.assertEqual(len(called), 1)
cached.invalidate(b, "__bar")
self.assertEqual(b.get_bar(), 1)
self.assertEqual(len(called), 2)
def test_invalidate_mangled_attribute(self):
# It should be possible to invalidate a private cached attribute
# by its mangled name.
called = []
class Bar:
@cached
def __bar(self):
called.append("bar")
return 1
def get_bar(self):
return self.__bar
b = Bar()
self.assertEqual(b.get_bar(), 1)
self.assertEqual(len(called), 1)
cached.invalidate(b, "_Bar__bar")
self.assertEqual(b.get_bar(), 1)
self.assertEqual(len(called), 2)
def test_invalidate_reserved_attribute(self):
# It should be possible to invalidate a reserved cached attribute.
called = []
class Bar:
@cached
def __bar__(self):
called.append("bar")
return 1
b = Bar()
self.assertEqual(b.__bar__, 1)
self.assertEqual(len(called), 1)
cached.invalidate(b, "__bar__")
self.assertEqual(b.__bar__, 1)
self.assertEqual(len(called), 2)
def test_invalidate_uncached_attribute(self):
# Invalidating an attribute that is not cached should
# raise an AttributeError.
called = []
class Bar:
def bar(self):
called.append("bar")
return 1
b = Bar()
self.assertException(
AttributeError,
"'Bar.bar' is not a cached attribute",
cached.invalidate,
b,
"bar",
)
def test_invalidate_uncached_private_attribute(self):
# Invalidating a private attribute that is not cached should
# raise an AttributeError.
called = []
class Bar:
def __bar(self):
called.append("bar")
return 1
b = Bar()
self.assertException(
AttributeError,
"'Bar._Bar__bar' is not a cached attribute",
cached.invalidate,
b,
"__bar",
)
def test_invalidate_unknown_attribute(self):
# Invalidating an unknown attribute should
# raise an AttributeError.
called = []
class Bar:
@cached
def bar(self):
called.append("bar")
return 1
b = Bar()
self.assertException(
AttributeError,
"type object 'Bar' has no attribute 'baz'",
lazy_property.invalidate,
b,
"baz",
)
def test_invalidate_readonly_object(self):
# Calling invalidate on a read-only object should
# raise an AttributeError.
called = []
class Bar:
__slots__ = ()
@cached
def bar(self):
called.append("bar")
return 1
b = Bar()
self.assertException(
AttributeError,
"'Bar' object has no attribute '__dict__'",
cached.invalidate,
b,
"bar",
)
def test_invalidate_superclass_attribute(self):
# cached.invalidate CANNOT invalidate a superclass (lazy_property) attribute.
called = []
class Bar:
@lazy_property
def bar(self):
called.append("bar")
return 1
b = Bar()
self.assertException(
AttributeError,
"'Bar.bar' is not a cached attribute",
cached.invalidate,
b,
"bar",
)
def test_invalidate_subclass_attribute(self):
# Whereas lazy_property.invalidate CAN invalidate a subclass (cached) attribute.
called = []
class Bar:
@cached
def bar(self):
called.append("bar")
return 1
b = Bar()
self.assertEqual(b.bar, 1)
self.assertEqual(len(called), 1)
lazy_property.invalidate(b, "bar")
self.assertEqual(b.bar, 1)
self.assertEqual(len(called), 2)
class AssertExceptionTests(TestCase):
def test_assert_AttributeError(self):
self.assertException(
AttributeError,
"'AssertExceptionTests' object has no attribute 'foobar'",
getattr,
self,
"foobar",
)
def test_assert_IOError(self):
self.assertException(IOError, "No such file or directory", open, "./foo/bar/baz/peng/quux", "rb")
def test_assert_SystemExit(self):
self.assertException(SystemExit, "", sys.exit)
def test_assert_exception_not_raised(self):
self.assertRaises(
AssertionError,
self.assertException,
AttributeError,
"'AssertExceptionTests' object has no attribute 'run'",
getattr,
self,
"run",
)
def test_assert_pattern_mismatch(self):
self.assertRaises(
AssertionError,
self.assertException,
AttributeError,
"baz",
getattr,
self,
"foobar",
)
class TryOrReturnTest(unittest.TestCase):
def test_decorator(self):
class A:
@return_if_raise(ValueError, "hello")
def return_one(self):
return 1
@return_if_raise(ValueError, "hello")
def return_hello(self):
raise ValueError()
@return_if_raise(KeyError, "hello")
def reraise_value_error(self):
raise ValueError()
@return_if_raise([KeyError, ValueError], "hello")
def catch_exc_list(self):
import random
if random.randint(0, 1) == 0:
raise ValueError()
else:
raise KeyError()
@return_none_if_raise(TypeError)
def return_none(self):
raise TypeError()
a = A()
aequal = self.assertEqual
aequal(a.return_one(), 1)
aequal(a.return_hello(), "hello")
with self.assertRaises(ValueError):
a.reraise_value_error()
aequal(a.catch_exc_list(), "hello")
self.assertTrue(a.return_none() is None)
class TimeoutTest(unittest.TestCase):
@unittest.skipIf(platform.system() == "Windows", "Skip on windows")
def test_with(self):
try:
with timeout(1, "timeout!"):
time.sleep(2)
self.assertTrue(False, "Did not timeout!")
except TimeoutError as ex:
self.assertEqual(ex.message, "timeout!")
class ProfMainTest(unittest.TestCase):
def test_prof_decorator(self):
"""Testing prof_main decorator."""
import sys
@prof_main
def main():
return sys.exit(1)
# Have to change argv before calling main.
# Will restore original values before returning.
bkp_sysargv = sys.argv[:]
if len(sys.argv) == 1:
sys.argv.append("prof")
else:
sys.argv[1] = "prof"
if __name__ == "__main__":
unittest.main()