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These tests consist of various Python constructions (hopefully a somewhat comprehensive set) with specific timestamp annotations scattered throughout. When the tests are run using the Python 3 interpreter, these annotations are checked and compared to the "current timestamp" to see that they are in agreement. This is what makes the tests "self-validating". There are a few different kinds of annotations: the basic `t[4]` style (meaning this is executed at timestamp 4), the `t.dead[4]` variant (meaning this _would_ happen at timestamp 4, but it is in a dead branch), and `t.never` (meaning this is never executed at all). In addition to this, there is a query, MissingAnnotations, which checks whether we have applied these annotations maximally. Many expression nodes are not actually annotatable, so there is a sizeable list of excluded nodes for that query.
86 lines
2.4 KiB
Python
86 lines
2.4 KiB
Python
"""Function calls and definitions — evaluation order."""
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from timer import test
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@test
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def test_argument_order(t):
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"""Arguments evaluate left-to-right before the call."""
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def add(a, b):
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return (a @ t[3] + b @ t[4]) @ t[5]
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result = (add @ t[0])(1 @ t[1], 2 @ t[2]) @ t[6]
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@test
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def test_multiple_arguments(t):
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"""All arguments left-to-right, then the call."""
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def f(a, b, c):
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return ((a @ t[4] + b @ t[5]) @ t[6] + c @ t[7]) @ t[8]
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result = (f @ t[0])(1 @ t[1], 2 @ t[2], 3 @ t[3]) @ t[9]
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@test
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def test_default_arguments(t):
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"""Default expressions are evaluated at definition time."""
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val = 5 @ t[0]
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def f(a, b=val @ t[1]):
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return (a @ t[4] + b @ t[5]) @ t[6]
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result = (f @ t[2])(10 @ t[3]) @ t[7]
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@test
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def test_args_kwargs(t):
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"""*args and **kwargs — expressions evaluated before the call."""
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def f(*args, **kwargs):
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return ((sum @ t[9])(args @ t[10]) @ t[11] + (sum @ t[12])(((kwargs @ t[13]).values @ t[14])() @ t[15]) @ t[16]) @ t[17]
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args = [1 @ t[0], 2 @ t[1]] @ t[2]
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kwargs = {"c" @ t[3]: 3 @ t[4]} @ t[5]
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result = (f @ t[6])(*args @ t[7], **kwargs @ t[8]) @ t[18]
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@test
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def test_nested_calls(t):
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"""Inner call completes before becoming an argument to outer call."""
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def f(x):
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return (x @ t[7] + 1 @ t[8]) @ t[9]
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def g(x):
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return (x @ t[3] * 2 @ t[4]) @ t[5]
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result = (f @ t[0])((g @ t[1])(1 @ t[2]) @ t[6]) @ t[10]
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@test
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def test_function_as_argument(t):
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"""Function object is just another argument, evaluated left-to-right."""
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def apply(fn, x):
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return (fn @ t[3])(x @ t[4]) @ t[8]
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def double(x):
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return (x @ t[5] * 2 @ t[6]) @ t[7]
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result = (apply @ t[0])(double @ t[1], 5 @ t[2]) @ t[9]
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@test
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def test_decorator(t):
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"""Decorator: expression evaluated, function defined, decorator called."""
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def my_decorator(fn):
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return fn @ t[1]
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@(my_decorator @ t[0])
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def f():
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return 42 @ t[3]
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result = (f @ t[2])() @ t[4]
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@test
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def test_keyword_arguments(t):
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"""Keyword argument values evaluate left-to-right."""
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def f(a, b):
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return (a @ t[3] + b @ t[4]) @ t[5]
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result = (f @ t[0])(a=1 @ t[1], b=2 @ t[2]) @ t[6]
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@test
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def test_return_value(t):
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"""The return value is just the result of the call expression."""
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def f(x):
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return (x @ t[2] * 2 @ t[3]) @ t[4]
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result = (f @ t[0])(3 @ t[1]) @ t[5]
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