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"""
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Test for async helpers.
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Should only trigger on python 3.5+ or will have syntax errors.
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"""
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import platform
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from itertools import chain, repeat
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from textwrap import dedent, indent
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from unittest import TestCase
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from IPython.testing.decorators import skip_without
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import sys
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from typing import TYPE_CHECKING
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if TYPE_CHECKING:
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from IPython import get_ipython
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ip = get_ipython()
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iprc = lambda x: ip.run_cell(dedent(x)).raise_error()
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iprc_nr = lambda x: ip.run_cell(dedent(x))
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from IPython.core.async_helpers import _should_be_async
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class AsyncTest(TestCase):
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def test_should_be_async(self):
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self.assertFalse(_should_be_async("False"))
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self.assertTrue(_should_be_async("await bar()"))
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self.assertTrue(_should_be_async("x = await bar()"))
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self.assertFalse(
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_should_be_async(
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dedent(
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"""
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async def awaitable():
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pass
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"""
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)
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)
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)
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def _get_top_level_cases(self):
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# These are test cases that should be valid in a function
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# but invalid outside of a function.
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test_cases = []
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test_cases.append(('basic', "{val}"))
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# Note, in all conditional cases, I use True instead of
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# False so that the peephole optimizer won't optimize away
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# the return, so CPython will see this as a syntax error:
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#
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# while True:
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# break
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# return
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#
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# But not this:
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#
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# while False:
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# return
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#
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# See https://bugs.python.org/issue1875
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test_cases.append(('if', dedent("""
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if True:
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{val}
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""")))
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test_cases.append(('while', dedent("""
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while True:
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{val}
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break
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""")))
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test_cases.append(('try', dedent("""
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try:
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{val}
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except:
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pass
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""")))
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test_cases.append(('except', dedent("""
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try:
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pass
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except:
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{val}
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""")))
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test_cases.append(('finally', dedent("""
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try:
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pass
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except:
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pass
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finally:
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{val}
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""")))
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test_cases.append(('for', dedent("""
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for _ in range(4):
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{val}
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""")))
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test_cases.append(('nested', dedent("""
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if True:
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while True:
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{val}
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break
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""")))
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test_cases.append(('deep-nested', dedent("""
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if True:
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while True:
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break
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for x in range(3):
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if True:
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while True:
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for x in range(3):
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{val}
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""")))
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return test_cases
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def _get_ry_syntax_errors(self):
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# This is a mix of tests that should be a syntax error if
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# return or yield whether or not they are in a function
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test_cases = []
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test_cases.append(('class', dedent("""
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class V:
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{val}
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""")))
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test_cases.append(('nested-class', dedent("""
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class V:
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class C:
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{val}
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""")))
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return test_cases
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def test_top_level_return_error(self):
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tl_err_test_cases = self._get_top_level_cases()
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tl_err_test_cases.extend(self._get_ry_syntax_errors())
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vals = ('return', 'yield', 'yield from (_ for _ in range(3))',
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dedent('''
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def f():
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pass
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return
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'''),
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)
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for test_name, test_case in tl_err_test_cases:
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# This example should work if 'pass' is used as the value
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with self.subTest((test_name, 'pass')):
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iprc(test_case.format(val='pass'))
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# It should fail with all the values
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for val in vals:
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with self.subTest((test_name, val)):
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msg = "Syntax error not raised for %s, %s" % (test_name, val)
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with self.assertRaises(SyntaxError, msg=msg):
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iprc(test_case.format(val=val))
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def test_in_func_no_error(self):
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# Test that the implementation of top-level return/yield
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# detection isn't *too* aggressive, and works inside a function
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func_contexts = []
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func_contexts.append(('func', False, dedent("""
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def f():""")))
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func_contexts.append(('method', False, dedent("""
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class MyClass:
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def __init__(self):
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""")))
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func_contexts.append(('async-func', True, dedent("""
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async def f():""")))
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func_contexts.append(('async-method', True, dedent("""
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class MyClass:
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async def f(self):""")))
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func_contexts.append(('closure', False, dedent("""
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def f():
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def g():
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""")))
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def nest_case(context, case):
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# Detect indentation
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lines = context.strip().splitlines()
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prefix_len = 0
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for c in lines[-1]:
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if c != ' ':
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break
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prefix_len += 1
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indented_case = indent(case, ' ' * (prefix_len + 4))
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return context + '\n' + indented_case
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# Gather and run the tests
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# yield is allowed in async functions, starting in Python 3.6,
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# and yield from is not allowed in any version
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vals = ('return', 'yield', 'yield from (_ for _ in range(3))')
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success_tests = zip(self._get_top_level_cases(), repeat(False))
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failure_tests = zip(self._get_ry_syntax_errors(), repeat(True))
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tests = chain(success_tests, failure_tests)
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for context_name, async_func, context in func_contexts:
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for (test_name, test_case), should_fail in tests:
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nested_case = nest_case(context, test_case)
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for val in vals:
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test_id = (context_name, test_name, val)
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cell = nested_case.format(val=val)
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with self.subTest(test_id):
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if should_fail:
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msg = ("SyntaxError not raised for %s" %
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str(test_id))
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with self.assertRaises(SyntaxError, msg=msg):
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iprc(cell)
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print(cell)
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else:
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iprc(cell)
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def test_nonlocal(self):
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# fails if outer scope is not a function scope or if var not defined
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with self.assertRaises(SyntaxError):
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iprc("nonlocal x")
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iprc("""
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x = 1
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def f():
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nonlocal x
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x = 10000
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yield x
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""")
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iprc("""
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def f():
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def g():
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nonlocal x
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x = 10000
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yield x
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""")
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# works if outer scope is a function scope and var exists
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iprc("""
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def f():
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x = 20
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def g():
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nonlocal x
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x = 10000
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yield x
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""")
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def test_execute(self):
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iprc("""
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import asyncio
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await asyncio.sleep(0.001)
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"""
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)
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def test_autoawait(self):
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iprc("%autoawait False")
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iprc("%autoawait True")
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iprc("""
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from asyncio import sleep
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await sleep(0.1)
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"""
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)
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def test_memory_error(self):
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"""
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The pgen parser in 3.8 or before use to raise MemoryError on too many
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nested parens anymore"""
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iprc("(" * 200 + ")" * 200)
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@skip_without('curio')
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def test_autoawait_curio(self):
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iprc("%autoawait curio")
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@skip_without('trio')
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def test_autoawait_trio(self):
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iprc("%autoawait trio")
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@skip_without('trio')
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def test_autoawait_trio_wrong_sleep(self):
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iprc("%autoawait trio")
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res = iprc_nr("""
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import asyncio
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await asyncio.sleep(0)
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""")
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with self.assertRaises(TypeError):
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res.raise_error()
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@skip_without('trio')
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def test_autoawait_asyncio_wrong_sleep(self):
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iprc("%autoawait asyncio")
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res = iprc_nr("""
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import trio
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await trio.sleep(0)
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""")
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with self.assertRaises(RuntimeError):
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res.raise_error()
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def tearDown(self):
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ip.loop_runner = "asyncio"
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