tests/cpydiff: Add initial set of tests for uPy-CPython differences.

These tests are intended to fail, as they provide a programatic record of
differences between uPy and CPython.  They also contain a special comment
at the start of the file which has meta-data describing the difference,
including known causes and known workarounds.
This commit is contained in:
Rami Ali 2017-02-07 15:55:37 +11:00 committed by Damien George
parent 89267886cc
commit 86c7507233
42 changed files with 445 additions and 0 deletions

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"""
categories: Core
description: Error messages may display incorrect argument counts
cause: Unknown
workaround: Unknown
"""
try:
[].append()
except Exception as e:
print(e)

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"""
categories: Core,Classes
description: Special method __del__ not implemented for user-defined classes
cause: Unknown
workaround: Unknown
"""
import gc
class Foo():
def __del__(self):
print('__del__')
f = Foo()
del f
gc.collect()

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"""
categories: Core,Classes
description: Bug when using "super" as a local
cause: Unknown
workaround: Unknown
"""
class A:
def foo(self):
super = [1]
super.pop()
print(super)
A().foo()

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"""
categories: Core,Classes
description: When inheriting from multiple classes super() only calls one class
cause: Depth first non-exhaustive method resolution order
workaround: Unknown
"""
class A:
def __init__(self):
print("A.__init__")
class B(A):
def __init__(self):
print("B.__init__")
super().__init__()
class C(A):
def __init__(self):
print("C.__init__")
super().__init__()
class D(B,C):
def __init__(self):
print("D.__init__")
super().__init__()
D()

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"""
categories: Core,Classes
description: Calling super() getter property in subclass will return a property object, not the value
cause: Unknown
workaround: Unknown
"""
class A:
@property
def p(self):
return {"a":10}
class AA(A):
@property
def p(self):
return super().p
a = AA()
print(a.p)

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"""
categories: Core,Functions
description: Assign instance variable to function
cause: Unknown
workaround: Unknown
"""
def f():
pass
f.x = 0
print(f.x)

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"""
categories: Core,Functions
description: Unpacking function arguments in non-last position gives incorrect result
cause: Unknown
workaround: Unknown
"""
print(*(1, 2), 3)

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"""
categories: Core,Generator
description: Context manager __exit__() not called in a generator which does not run to completion
cause: Unknown
workaround: Unknown
"""
class foo(object):
def __enter__(self):
print('Enter')
def __exit__(self, *args):
print('Exit')
def bar(x):
with foo():
while True:
x += 1
yield x
def func():
g = bar(0)
for _ in range(3):
print(next(g))
func()

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"""
categories: Core,import
description: Failed to load modules are still registered as loaded
cause: Unknown
workaround: Unknown
"""
import sys
try:
from modules import foo
except NameError as e:
print(e)
try:
from modules import foo
print('Should not get here')
except NameError as e:
print(e)

15
tests/cpydiff/core_mro.py Normal file
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"""
categories: Core
description: Method Resolution Order (MRO) is not compliant with CPython
cause: Unknown
workaround: Unknown
"""
class Foo:
def __str__(self):
return "Foo"
class C(tuple, Foo):
pass
t = C((1, 2, 3))
print(t)

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print('foo')
xxx

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"""
categories: Modules,array
description: Looking for integer not implemented
cause: Unknown
workaround: Unknown
"""
import array
print(1 in array.array('B', b'12'))

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"""
categories: Modules,array
description: Array deletion not implemented
cause: Unknown
workaround: Unknown
"""
import array
a = array.array('b', (1, 2, 3))
del a[1]
print(a)

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"""
categories: Modules,array
description: Subscript with step != 1 is not yet implemented
cause: Unknown
workaround: Unknown
"""
import array
a = array.array('b', (1, 2, 3))
print(a[3:2:2])

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"""
categories: Modules,deque
description: Deque not implemented
cause: Unknown
workaround: Use regular queues or lists creatively
"""
import collections
D = collections.deque()
print(D)

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"""
categories: Modules,json
description: JSON module does not throw exception when object is not serialisable
cause: Unknown
workaround: Unknown
"""
import json
a = bytes(x for x in range(256))
try:
z = json.dumps(a)
x = json.loads(z)
print('Should not get here')
except TypeError:
print('TypeError')

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"""
categories: Modules,struct
description: Struct pack with too few args, not checked by uPy
cause: Unknown
workaround: Unknown
"""
import struct
try:
print(struct.pack('bb', 1))
print('Should not get here')
except:
print('struct.error')

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"""
categories: Modules,struct
description: Struct pack with too many args, not checked by uPy
cause: Unknown
workaround: Unknown
"""
import struct
try:
print(struct.pack('bb', 1, 2, 3))
print('Should not get here')
except:
print('struct.error')

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"""
categories: Modules,sys
description: Override sys.stdin, sys.stdout and sys.stderr. Impossible as they are stored in read-only memory.
cause: Unknown
workaround: Unknown
"""
import sys
sys.stdin = None
print(sys.stdin)

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"""
categories: Syntax,Spaces
description: uPy requires spaces between literal numbers and keywords, CPy doesn't
cause: Unknown
workaround: Unknown
"""
try:
print(eval('1and 0'))
except SyntaxError:
print('Should have worked')
try:
print(eval('1or 0'))
except SyntaxError:
print('Should have worked')
try:
print(eval('1if 1else 0'))
except SyntaxError:
print('Should have worked')

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"""
categories: Syntax,Unicode
description: Unicode name escapes are not implemented
cause: Unknown
workaround: Unknown
"""
print("\N{LATIN SMALL LETTER A}")

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"""
categories: Types,bytearray
description: Array slice assignment with unsupported RHS
cause: Unknown
workaround: Unknown
"""
b = bytearray(4)
b[0:1] = [1, 2]
print(b)

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"""
categories: Types,bytes
description: bytes(...) with keywords not implemented
cause: Unknown
workaround: Input the encoding format directly. eg. ``print(bytes('abc', 'utf-8'))``
"""
print(bytes('abc', encoding='utf8'))

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"""
categories: Types,bytes
description: Bytes subscr with step != 1 not implemented
cause: Unknown
workaround: Unknown
"""
print(b'123'[0:3:2])

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"""
categories: Types,Exception
description: Exception chaining not implemented
cause: Unknown
workaround: Unknown
"""
try:
raise TypeError
except TypeError:
raise ValueError

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"""
categories: Types,Exception
description: Assign instance variable to exception
cause: Unknown
workaround: Unknown
"""
e = Exception()
e.x = 0
print(e.x)

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"""
categories: Types,Exception
description: While loop guards will obscure exception line number reporting due to being optimised onto the end of the code block
cause: Unknown
workaround: Unknown
"""
l = ["-foo", "-bar"]
i = 0
while l[i][0] == "-":
print("iter")
i += 1

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"""
categories: Types,Exception
description: Exception.__init__ raises TypeError if overridden and called by subclass
cause: Unknown
workaround: Unknown
"""
class A(Exception):
def __init__(self):
Exception.__init__(self)
a = A()

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"""
categories: Types,float
description: uPy and CPython outputs formats differ
cause: Unknown
workaround: Unknown
"""
print('%.1g' % -9.9)
print('%.1e' % 9.99)
print('%.1e' % 0.999)

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"""
categories: Types,int
description: No int conversion for int-derived types available
cause: Unknown
workaround: Unknown
"""
class A(int):
__add__ = lambda self, other: A(int(self) + other)
a = A(42)
print(a+a)

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"""
categories: Types,int
description: Incorrect error message when passing float into to_bytes
cause: Unknown
workaround: Unknown
"""
try:
int('1').to_bytes(1.0)
except TypeError as e:
print(e)

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"""
categories: Types,list
description: List delete with step != 1 not implemented
cause: Unknown
workaround: Unknown
"""
l = [1, 2, 3, 4]
del l[0:4:2]
print(l)

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"""
categories: Types,list
description: List store with step != 1 not implemented
cause: Unknown
workaround: Unknown
"""
l = [1, 2, 3, 4]
l[0:4:2] = [5, 6]
print(l)

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"""
categories: Types,str
description: UnicodeDecodeError not raised when expected
cause: Unknown
workaround: Unknown
"""
try:
print(repr(str(b"\xa1\x80", 'utf8')))
print('Should not get here')
except UnicodeDecodeError:
print('UnicodeDecodeError')

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"""
categories: Types,str
description: Start/end indices such as str.endswith(s, start) not implemented
cause: Unknown
workaround: Unknown
"""
print('abc'.endswith('c', 1))

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"""
categories: Types,str
description: Attributes/subscr not implemented
cause: Unknown
workaround: Unknown
"""
print('{a[0]}'.format(a=[1, 2]))

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"""
categories: Types,str
description: str(...) with keywords not implemented
cause: Unknown
workaround: Input the encoding format directly. eg ``print(bytes('abc', 'utf-8'))``
"""
print(str(b'abc', encoding='utf8'))

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"""
categories: Types,str
description: None as first argument for rsplit such as str.rsplit(None, n) not implemented
cause: Unknown
workaround: Unknown
"""
print('a a a'.rsplit(None, 1))

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"""
categories: Types,str
description: Instance of a subclass of str cannot be compared for equality with an instance of a str
cause: Unknown
workaround: Unknown
"""
class S(str):
pass
s = S('hello')
print(s == 'hello')

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"""
categories: Types,str
description: Subscript with step != 1 is not yet implemented
cause: Unknown
workaround: Unknown
"""
print('abcdefghi'[0:9:2])

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"""
categories: Types,tuple
description: Tuple load with step != 1 not implemented
cause: Unknown
workaround: Unknown
"""
print((1, 2, 3, 4)[0:4:2])