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# Licensed under the Apache License: http://www.apache.org/licenses/LICENSE-2.0
# For details: https://github.com/nedbat/coveragepy/blob/master/NOTICE.txt
"""Tests of miscellaneous stuff."""
import pytest
from coverage.misc import contract, dummy_decorator_with_args, file_be_gone
from coverage.misc import Hasher, one_of, substitute_variables
from coverage.misc import CoverageException, USE_CONTRACTS
from tests.coveragetest import CoverageTest
class HasherTest(CoverageTest):
"""Test our wrapper of md5 hashing."""
run_in_temp_dir = False
def test_string_hashing(self):
h1 = Hasher()
h1.update("Hello, world!")
h2 = Hasher()
h2.update("Goodbye!")
h3 = Hasher()
h3.update("Hello, world!")
self.assertNotEqual(h1.hexdigest(), h2.hexdigest())
self.assertEqual(h1.hexdigest(), h3.hexdigest())
def test_bytes_hashing(self):
h1 = Hasher()
h1.update(b"Hello, world!")
h2 = Hasher()
h2.update(b"Goodbye!")
self.assertNotEqual(h1.hexdigest(), h2.hexdigest())
def test_unicode_hashing(self):
h1 = Hasher()
h1.update(u"Hello, world! \N{SNOWMAN}")
h2 = Hasher()
h2.update(u"Goodbye!")
self.assertNotEqual(h1.hexdigest(), h2.hexdigest())
def test_dict_hashing(self):
h1 = Hasher()
h1.update({'a': 17, 'b': 23})
h2 = Hasher()
h2.update({'b': 23, 'a': 17})
self.assertEqual(h1.hexdigest(), h2.hexdigest())
def test_dict_collision(self):
h1 = Hasher()
h1.update({'a': 17, 'b': {'c': 1, 'd': 2}})
h2 = Hasher()
h2.update({'a': 17, 'b': {'c': 1}, 'd': 2})
self.assertNotEqual(h1.hexdigest(), h2.hexdigest())
class RemoveFileTest(CoverageTest):
"""Tests of misc.file_be_gone."""
def test_remove_nonexistent_file(self):
# It's OK to try to remove a file that doesn't exist.
file_be_gone("not_here.txt")
def test_remove_actual_file(self):
# It really does remove a file that does exist.
self.make_file("here.txt", "We are here, we are here, we are here!")
file_be_gone("here.txt")
self.assert_doesnt_exist("here.txt")
def test_actual_errors(self):
# Errors can still happen.
# ". is a directory" on Unix, or "Access denied" on Windows
with self.assertRaises(OSError):
file_be_gone(".")
class ContractTest(CoverageTest):
"""Tests of our contract decorators."""
run_in_temp_dir = False
def setUp(self):
super(ContractTest, self).setUp()
if not USE_CONTRACTS:
self.skipTest("Contracts are disabled")
def test_bytes(self):
@contract(text='bytes|None')
def need_bytes(text=None):
return text
assert need_bytes(b"Hey") == b"Hey"
assert need_bytes() is None
with pytest.raises(Exception):
need_bytes(u"Oops")
def test_unicode(self):
@contract(text='unicode|None')
def need_unicode(text=None):
return text
assert need_unicode(u"Hey") == u"Hey"
assert need_unicode() is None
with pytest.raises(Exception):
need_unicode(b"Oops")
def test_one_of(self):
@one_of("a, b, c")
def give_me_one(a=None, b=None, c=None):
return (a, b, c)
assert give_me_one(a=17) == (17, None, None)
assert give_me_one(b=set()) == (None, set(), None)
assert give_me_one(c=17) == (None, None, 17)
with pytest.raises(AssertionError):
give_me_one(a=17, b=set())
with pytest.raises(AssertionError):
give_me_one()
def test_dummy_decorator_with_args(self):
@dummy_decorator_with_args("anything", this=17, that="is fine")
def undecorated(a=None, b=None):
return (a, b)
assert undecorated() == (None, None)
assert undecorated(17) == (17, None)
assert undecorated(b=23) == (None, 23)
assert undecorated(b=42, a=3) == (3, 42)
VARS = {
'FOO': 'fooey',
'BAR': 'xyzzy',
}
@pytest.mark.parametrize("before, after", [
("Nothing to do", "Nothing to do"),
("Dollar: $$", "Dollar: $"),
("Simple: $FOO is fooey", "Simple: fooey is fooey"),
("Braced: X${FOO}X.", "Braced: XfooeyX."),
("Missing: x${NOTHING}y is xy", "Missing: xy is xy"),
("Multiple: $$ $FOO $BAR ${FOO}", "Multiple: $ fooey xyzzy fooey"),
("Ill-formed: ${%5} ${{HI}} ${", "Ill-formed: ${%5} ${{HI}} ${"),
("Strict: ${FOO?} is there", "Strict: fooey is there"),
("Defaulted: ${WUT-missing}!", "Defaulted: missing!"),
("Defaulted empty: ${WUT-}!", "Defaulted empty: !"),
])
def test_substitute_variables(before, after):
assert substitute_variables(before, VARS) == after
@pytest.mark.parametrize("text", [
"Strict: ${NOTHING?} is an error",
])
def test_substitute_variables_errors(text):
with pytest.raises(CoverageException) as exc_info:
substitute_variables(text, VARS)
assert text in str(exc_info.value)
assert "Variable NOTHING is undefined" in str(exc_info.value)
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