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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.
59 lines
1.1 KiB
Python
59 lines
1.1 KiB
Python
"""Evaluation order tests for with statements."""
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from contextlib import contextmanager
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from timer import test
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@contextmanager
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def ctx(value=None):
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yield value
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@test
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def test_simple_with(t):
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x = 1 @ t[0]
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with (ctx @ t[1])() @ t[2]:
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y = 2 @ t[3]
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z = 3 @ t[4]
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@test
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def test_with_as(t):
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with (ctx @ t[0])(42 @ t[1]) @ t[2] as v:
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x = v @ t[3]
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y = 0 @ t[4]
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@test
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def test_nested_with(t):
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with (ctx @ t[0])() @ t[1]:
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with (ctx @ t[2])() @ t[3]:
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x = 1 @ t[4]
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y = 2 @ t[5]
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@test
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def test_multiple_context_managers(t):
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with (ctx @ t[0])(1 @ t[1]) @ t[2] as a, (ctx @ t[3])(2 @ t[4]) @ t[5] as b:
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x = (a @ t[6], b @ t[7]) @ t[8]
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y = 0 @ t[9]
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@test
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def test_with_exception_handling(t):
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try:
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with (ctx @ t[0])() @ t[1]:
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x = 1 @ t[2]
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raise ((ValueError @ t[3])() @ t[4])
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except ValueError:
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y = 2 @ t[5]
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z = 3 @ t[6]
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@test
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def test_with_in_loop(t):
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for i in [1 @ t[0], 2 @ t[1]] @ t[2]:
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with (ctx @ t[3, 6])() @ t[4, 7]:
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x = i @ t[5, 8]
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y = 0 @ t[9]
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