tests: add a module that can perform the equivalent of `SIGKILL` on any OS
I started with this being Windows specific, but let's push all of the decision
making into this function so that it can just be called by the tests. The
tradeoff is that this is very specific to sending `SIGKILL`- since
`signal.SIGKILL` doesn't exist on Windows, the desired signal can't be passed
from the caller. Maybe there's a way, but let's wait until there's a need.
We don't use `killdaemons.py` unconditionally because it starts with a more
graceful `SIGTERM` on posix.
import collections
import struct
import unittest
from mercurial import mdiff
class diffreplace(collections.namedtuple('diffreplace', 'start end from_ to')):
def __repr__(self):
return 'diffreplace(%r, %r, %r, %r)' % self
class BdiffTests(unittest.TestCase):
def assert_bdiff_applies(self, a, b):
d = mdiff.textdiff(a, b)
c = a
if d:
c = mdiff.patches(a, [d])
self.assertEqual(
c,
b,
(
"bad diff+patch result from\n %r to\n "
"%r: \nbdiff: %r\npatched: %r" % (a, b, d, c[:200])
),
)
def assert_bdiff(self, a, b):
self.assert_bdiff_applies(a, b)
self.assert_bdiff_applies(b, a)
def test_bdiff_basic(self):
cases = [
(b"a\nc\n\n\n\n", b"a\nb\n\n\n"),
(b"a\nb\nc\n", b"a\nc\n"),
(b"", b""),
(b"a\nb\nc", b"a\nb\nc"),
(b"a\nb\nc\nd\n", b"a\nd\n"),
(b"a\nb\nc\nd\n", b"a\nc\ne\n"),
(b"a\nb\nc\n", b"a\nc\n"),
(b"a\n", b"c\na\nb\n"),
(b"a\n", b""),
(b"a\n", b"b\nc\n"),
(b"a\n", b"c\na\n"),
(b"", b"adjfkjdjksdhfksj"),
(b"", b"ab"),
(b"", b"abc"),
(b"a", b"a"),
(b"ab", b"ab"),
(b"abc", b"abc"),
(b"a\n", b"a\n"),
(b"a\nb", b"a\nb"),
]
for a, b in cases:
self.assert_bdiff(a, b)
def showdiff(self, a, b):
bin = mdiff.textdiff(a, b)
pos = 0
q = 0
actions = []
while pos < len(bin):
p1, p2, l = struct.unpack(">lll", bin[pos : pos + 12])
pos += 12
if p1:
actions.append(a[q:p1])
actions.append(diffreplace(p1, p2, a[p1:p2], bin[pos : pos + l]))
pos += l
q = p2
if q < len(a):
actions.append(a[q:])
return actions
def test_issue1295(self):
cases = [
(
b"x\n\nx\n\nx\n\nx\n\nz\n",
b"x\n\nx\n\ny\n\nx\n\nx\n\nz\n",
[
b'x\n\nx\n\n',
diffreplace(6, 6, b'', b'y\n\n'),
b'x\n\nx\n\nz\n',
],
),
(
b"x\n\nx\n\nx\n\nx\n\nz\n",
b"x\n\nx\n\ny\n\nx\n\ny\n\nx\n\nz\n",
[
b'x\n\nx\n\n',
diffreplace(6, 6, b'', b'y\n\n'),
b'x\n\n',
diffreplace(9, 9, b'', b'y\n\n'),
b'x\n\nz\n',
],
),
]
for old, new, want in cases:
self.assertEqual(self.showdiff(old, new), want)
def test_issue1295_varies_on_pure(self):
# we should pick up abbbc. rather than bc.de as the longest match
got = self.showdiff(
b"a\nb\nb\nb\nc\n.\nd\ne\n.\nf\n",
b"a\nb\nb\na\nb\nb\nb\nc\n.\nb\nc\n.\nd\ne\nf\n",
)
want_c = [
b'a\nb\nb\n',
diffreplace(6, 6, b'', b'a\nb\nb\nb\nc\n.\n'),
b'b\nc\n.\nd\ne\n',
diffreplace(16, 18, b'.\n', b''),
b'f\n',
]
want_pure = [
diffreplace(0, 0, b'', b'a\nb\nb\n'),
b'a\nb\nb\nb\nc\n.\n',
diffreplace(12, 12, b'', b'b\nc\n.\n'),
b'd\ne\n',
diffreplace(16, 18, b'.\n', b''),
b'f\n',
]
self.assertTrue(
got in (want_c, want_pure),
'got: %r, wanted either %r or %r' % (got, want_c, want_pure),
)
def test_fixws(self):
cases = [
(b" \ta\r b\t\n", b"ab\n", 1),
(b" \ta\r b\t\n", b" a b\n", 0),
(b"", b"", 1),
(b"", b"", 0),
]
for a, b, allws in cases:
c = mdiff.fixws(a, allws)
self.assertEqual(
c, b, 'fixws(%r) want %r got %r (allws=%r)' % (a, b, c, allws)
)
def test_nice_diff_for_trivial_change(self):
self.assertEqual(
self.showdiff(
b''.join(b'<%d\n-\n' % i for i in range(5)),
b''.join(b'>%d\n-\n' % i for i in range(5)),
),
[
diffreplace(0, 3, b'<0\n', b'>0\n'),
b'-\n',
diffreplace(5, 8, b'<1\n', b'>1\n'),
b'-\n',
diffreplace(10, 13, b'<2\n', b'>2\n'),
b'-\n',
diffreplace(15, 18, b'<3\n', b'>3\n'),
b'-\n',
diffreplace(20, 23, b'<4\n', b'>4\n'),
b'-\n',
],
)
def test_prefer_appending(self):
# 1 line to 3 lines
self.assertEqual(
self.showdiff(b'a\n', b'a\n' * 3),
[b'a\n', diffreplace(2, 2, b'', b'a\na\n')],
)
# 1 line to 5 lines
self.assertEqual(
self.showdiff(b'a\n', b'a\n' * 5),
[b'a\n', diffreplace(2, 2, b'', b'a\na\na\na\n')],
)
def test_prefer_removing_trailing(self):
# 3 lines to 1 line
self.assertEqual(
self.showdiff(b'a\n' * 3, b'a\n'),
[b'a\n', diffreplace(2, 6, b'a\na\n', b'')],
)
# 5 lines to 1 line
self.assertEqual(
self.showdiff(b'a\n' * 5, b'a\n'),
[b'a\n', diffreplace(2, 10, b'a\na\na\na\n', b'')],
)
if __name__ == '__main__':
import silenttestrunner
silenttestrunner.main(__name__)