view tests/test-match.py @ 44363:f7459da77f23

nodemap: introduce an option to use mmap to read the nodemap mapping

The performance and memory benefit is much greater if we don't have to copy all
the data in memory for each information. So we introduce an option (on by
default) to read the data using mmap.

This changeset is the last one definition the API for index support nodemap
data. (they have to be able to use the mmaping).

Below are some benchmark comparing the best we currently have in 5.3 with the
final step of this series (using the persistent nodemap implementation in
Rust). The benchmark run `hg perfindex` with various revset and the following
variants:

Before:

 * do not use the persistent nodemap
 * use the CPython implementation of the index for nodemap
 * use mmapping of the changelog index

After:

 * use the MixedIndex Rust code, with the NodeTree object for nodemap access
   (still in review)
 * use the persistent nodemap data from disk
 * access the persistent nodemap data through mmap
 * use mmapping of the changelog index

The persistent nodemap greatly speed up  most operation on very large
repositories. Some of the previously very fast lookup end up a bit slower because
the persistent nodemap has to be setup. However the absolute slowdown is very
small and won't matters in the big picture.

Here are some numbers (in seconds) for the reference copy of mozilla-try:

Revset            Before   After     abs-change speedup

-10000:           0.004622 0.005532   0.000910  ×   0.83
-10:              0.000050 0.000132   0.000082  ×   0.37
tip               0.000052 0.000085   0.000033  ×   0.61
0 + (-10000:)     0.028222 0.005337  -0.022885  ×   5.29
0                 0.023521 0.000084  -0.023437  × 280.01
(-10000:) + 0     0.235539 0.005308  -0.230231  ×  44.37
(-10:) + :9       0.232883 0.000180  -0.232703  ×1293.79
(-10000:) + (:99) 0.238735 0.005358  -0.233377  ×  44.55
:99 + (-10000:)   0.317942 0.005593  -0.312349  ×  56.84
:9 + (-10:)       0.313372 0.000179  -0.313193  ×1750.68
:9                0.316450 0.000143  -0.316307  ×2212.93


On smaller repositories, the cost of nodemap related operation is not as big, so
the win is much more modest. Yet it helps shaving a handful of millisecond here
and there.

Here are some numbers (in seconds) for the reference copy of mercurial:

Revset            Before   After     abs-change speedup
-10:              0.000065 0.000097   0.000032  × 0.67
tip               0.000063 0.000078   0.000015  × 0.80
0                 0.000561 0.000079  -0.000482  × 7.10
-10000:           0.004609 0.003648  -0.000961  × 1.26
0 + (-10000:)     0.005023 0.003715  -0.001307  × 1.35
(-10:) + :9       0.002187 0.000108  -0.002079  ×20.25
(-10000:) + 0     0.006252 0.003716  -0.002536  × 1.68
(-10000:) + (:99) 0.006367 0.003707  -0.002660  × 1.71
:9 + (-10:)       0.003846 0.000110  -0.003736  ×34.96
:9                0.003854 0.000099  -0.003755  ×38.92
:99 + (-10000:)   0.007644 0.003778  -0.003866  × 2.02

Differential Revision: https://phab.mercurial-scm.org/D7894

from __future__ import absolute_import

import unittest

import silenttestrunner

from mercurial import (
    match as matchmod,
    util,
)


noop_auditor = lambda name: None


class BaseMatcherTests(unittest.TestCase):
    def testVisitdir(self):
        m = matchmod.basematcher()
        self.assertTrue(m.visitdir(b''))
        self.assertTrue(m.visitdir(b'dir'))

    def testVisitchildrenset(self):
        m = matchmod.basematcher()
        self.assertEqual(m.visitchildrenset(b''), b'this')
        self.assertEqual(m.visitchildrenset(b'dir'), b'this')


class AlwaysMatcherTests(unittest.TestCase):
    def testVisitdir(self):
        m = matchmod.alwaysmatcher()
        self.assertEqual(m.visitdir(b''), b'all')
        self.assertEqual(m.visitdir(b'dir'), b'all')

    def testVisitchildrenset(self):
        m = matchmod.alwaysmatcher()
        self.assertEqual(m.visitchildrenset(b''), b'all')
        self.assertEqual(m.visitchildrenset(b'dir'), b'all')


class NeverMatcherTests(unittest.TestCase):
    def testVisitdir(self):
        m = matchmod.nevermatcher()
        self.assertFalse(m.visitdir(b''))
        self.assertFalse(m.visitdir(b'dir'))

    def testVisitchildrenset(self):
        m = matchmod.nevermatcher()
        self.assertEqual(m.visitchildrenset(b''), set())
        self.assertEqual(m.visitchildrenset(b'dir'), set())


class PredicateMatcherTests(unittest.TestCase):
    # predicatematcher does not currently define either of these methods, so
    # this is equivalent to BaseMatcherTests.

    def testVisitdir(self):
        m = matchmod.predicatematcher(lambda *a: False)
        self.assertTrue(m.visitdir(b''))
        self.assertTrue(m.visitdir(b'dir'))

    def testVisitchildrenset(self):
        m = matchmod.predicatematcher(lambda *a: False)
        self.assertEqual(m.visitchildrenset(b''), b'this')
        self.assertEqual(m.visitchildrenset(b'dir'), b'this')


class PatternMatcherTests(unittest.TestCase):
    def testVisitdirPrefix(self):
        m = matchmod.match(
            util.localpath(b'/repo'), b'', patterns=[b'path:dir/subdir']
        )
        assert isinstance(m, matchmod.patternmatcher)
        self.assertTrue(m.visitdir(b''))
        self.assertTrue(m.visitdir(b'dir'))
        self.assertEqual(m.visitdir(b'dir/subdir'), b'all')
        # OPT: This should probably be 'all' if its parent is?
        self.assertTrue(m.visitdir(b'dir/subdir/x'))
        self.assertFalse(m.visitdir(b'folder'))

    def testVisitchildrensetPrefix(self):
        m = matchmod.match(
            util.localpath(b'/repo'), b'', patterns=[b'path:dir/subdir']
        )
        assert isinstance(m, matchmod.patternmatcher)
        self.assertEqual(m.visitchildrenset(b''), b'this')
        self.assertEqual(m.visitchildrenset(b'dir'), b'this')
        self.assertEqual(m.visitchildrenset(b'dir/subdir'), b'all')
        # OPT: This should probably be 'all' if its parent is?
        self.assertEqual(m.visitchildrenset(b'dir/subdir/x'), b'this')
        self.assertEqual(m.visitchildrenset(b'folder'), set())

    def testVisitdirRootfilesin(self):
        m = matchmod.match(
            util.localpath(b'/repo'), b'', patterns=[b'rootfilesin:dir/subdir'],
        )
        assert isinstance(m, matchmod.patternmatcher)
        self.assertFalse(m.visitdir(b'dir/subdir/x'))
        self.assertFalse(m.visitdir(b'folder'))
        # FIXME: These should probably be True.
        self.assertFalse(m.visitdir(b''))
        self.assertFalse(m.visitdir(b'dir'))
        self.assertFalse(m.visitdir(b'dir/subdir'))

    def testVisitchildrensetRootfilesin(self):
        m = matchmod.match(
            util.localpath(b'/repo'), b'', patterns=[b'rootfilesin:dir/subdir'],
        )
        assert isinstance(m, matchmod.patternmatcher)
        self.assertEqual(m.visitchildrenset(b'dir/subdir/x'), set())
        self.assertEqual(m.visitchildrenset(b'folder'), set())
        # FIXME: These should probably be {'dir'}, {'subdir'} and 'this',
        # respectively, or at least 'this' for all three.
        self.assertEqual(m.visitchildrenset(b''), set())
        self.assertEqual(m.visitchildrenset(b'dir'), set())
        self.assertEqual(m.visitchildrenset(b'dir/subdir'), set())

    def testVisitdirGlob(self):
        m = matchmod.match(
            util.localpath(b'/repo'), b'', patterns=[b'glob:dir/z*']
        )
        assert isinstance(m, matchmod.patternmatcher)
        self.assertTrue(m.visitdir(b''))
        self.assertTrue(m.visitdir(b'dir'))
        self.assertFalse(m.visitdir(b'folder'))
        # OPT: these should probably be False.
        self.assertTrue(m.visitdir(b'dir/subdir'))
        self.assertTrue(m.visitdir(b'dir/subdir/x'))

    def testVisitchildrensetGlob(self):
        m = matchmod.match(
            util.localpath(b'/repo'), b'', patterns=[b'glob:dir/z*']
        )
        assert isinstance(m, matchmod.patternmatcher)
        self.assertEqual(m.visitchildrenset(b''), b'this')
        self.assertEqual(m.visitchildrenset(b'folder'), set())
        self.assertEqual(m.visitchildrenset(b'dir'), b'this')
        # OPT: these should probably be set().
        self.assertEqual(m.visitchildrenset(b'dir/subdir'), b'this')
        self.assertEqual(m.visitchildrenset(b'dir/subdir/x'), b'this')


class IncludeMatcherTests(unittest.TestCase):
    def testVisitdirPrefix(self):
        m = matchmod.match(
            util.localpath(b'/repo'), b'', include=[b'path:dir/subdir']
        )
        assert isinstance(m, matchmod.includematcher)
        self.assertTrue(m.visitdir(b''))
        self.assertTrue(m.visitdir(b'dir'))
        self.assertEqual(m.visitdir(b'dir/subdir'), b'all')
        # OPT: This should probably be 'all' if its parent is?
        self.assertTrue(m.visitdir(b'dir/subdir/x'))
        self.assertFalse(m.visitdir(b'folder'))

    def testVisitchildrensetPrefix(self):
        m = matchmod.match(
            util.localpath(b'/repo'), b'', include=[b'path:dir/subdir']
        )
        assert isinstance(m, matchmod.includematcher)
        self.assertEqual(m.visitchildrenset(b''), {b'dir'})
        self.assertEqual(m.visitchildrenset(b'dir'), {b'subdir'})
        self.assertEqual(m.visitchildrenset(b'dir/subdir'), b'all')
        # OPT: This should probably be 'all' if its parent is?
        self.assertEqual(m.visitchildrenset(b'dir/subdir/x'), b'this')
        self.assertEqual(m.visitchildrenset(b'folder'), set())

    def testVisitdirRootfilesin(self):
        m = matchmod.match(
            util.localpath(b'/repo'), b'', include=[b'rootfilesin:dir/subdir']
        )
        assert isinstance(m, matchmod.includematcher)
        self.assertTrue(m.visitdir(b''))
        self.assertTrue(m.visitdir(b'dir'))
        self.assertTrue(m.visitdir(b'dir/subdir'))
        self.assertFalse(m.visitdir(b'dir/subdir/x'))
        self.assertFalse(m.visitdir(b'folder'))

    def testVisitchildrensetRootfilesin(self):
        m = matchmod.match(
            util.localpath(b'/repo'), b'', include=[b'rootfilesin:dir/subdir']
        )
        assert isinstance(m, matchmod.includematcher)
        self.assertEqual(m.visitchildrenset(b''), {b'dir'})
        self.assertEqual(m.visitchildrenset(b'dir'), {b'subdir'})
        self.assertEqual(m.visitchildrenset(b'dir/subdir'), b'this')
        self.assertEqual(m.visitchildrenset(b'dir/subdir/x'), set())
        self.assertEqual(m.visitchildrenset(b'folder'), set())

    def testVisitdirGlob(self):
        m = matchmod.match(
            util.localpath(b'/repo'), b'', include=[b'glob:dir/z*']
        )
        assert isinstance(m, matchmod.includematcher)
        self.assertTrue(m.visitdir(b''))
        self.assertTrue(m.visitdir(b'dir'))
        self.assertFalse(m.visitdir(b'folder'))
        # OPT: these should probably be False.
        self.assertTrue(m.visitdir(b'dir/subdir'))
        self.assertTrue(m.visitdir(b'dir/subdir/x'))

    def testVisitchildrensetGlob(self):
        m = matchmod.match(
            util.localpath(b'/repo'), b'', include=[b'glob:dir/z*']
        )
        assert isinstance(m, matchmod.includematcher)
        self.assertEqual(m.visitchildrenset(b''), {b'dir'})
        self.assertEqual(m.visitchildrenset(b'folder'), set())
        self.assertEqual(m.visitchildrenset(b'dir'), b'this')
        # OPT: these should probably be set().
        self.assertEqual(m.visitchildrenset(b'dir/subdir'), b'this')
        self.assertEqual(m.visitchildrenset(b'dir/subdir/x'), b'this')


class ExactMatcherTests(unittest.TestCase):
    def testVisitdir(self):
        m = matchmod.exact(files=[b'dir/subdir/foo.txt'])
        assert isinstance(m, matchmod.exactmatcher)
        self.assertTrue(m.visitdir(b''))
        self.assertTrue(m.visitdir(b'dir'))
        self.assertTrue(m.visitdir(b'dir/subdir'))
        self.assertFalse(m.visitdir(b'dir/subdir/foo.txt'))
        self.assertFalse(m.visitdir(b'dir/foo'))
        self.assertFalse(m.visitdir(b'dir/subdir/x'))
        self.assertFalse(m.visitdir(b'folder'))

    def testVisitchildrenset(self):
        m = matchmod.exact(files=[b'dir/subdir/foo.txt'])
        assert isinstance(m, matchmod.exactmatcher)
        self.assertEqual(m.visitchildrenset(b''), {b'dir'})
        self.assertEqual(m.visitchildrenset(b'dir'), {b'subdir'})
        self.assertEqual(m.visitchildrenset(b'dir/subdir'), {b'foo.txt'})
        self.assertEqual(m.visitchildrenset(b'dir/subdir/x'), set())
        self.assertEqual(m.visitchildrenset(b'dir/subdir/foo.txt'), set())
        self.assertEqual(m.visitchildrenset(b'folder'), set())

    def testVisitchildrensetFilesAndDirs(self):
        m = matchmod.exact(
            files=[
                b'rootfile.txt',
                b'a/file1.txt',
                b'a/b/file2.txt',
                # no file in a/b/c
                b'a/b/c/d/file4.txt',
            ]
        )
        assert isinstance(m, matchmod.exactmatcher)
        self.assertEqual(m.visitchildrenset(b''), {b'a', b'rootfile.txt'})
        self.assertEqual(m.visitchildrenset(b'a'), {b'b', b'file1.txt'})
        self.assertEqual(m.visitchildrenset(b'a/b'), {b'c', b'file2.txt'})
        self.assertEqual(m.visitchildrenset(b'a/b/c'), {b'd'})
        self.assertEqual(m.visitchildrenset(b'a/b/c/d'), {b'file4.txt'})
        self.assertEqual(m.visitchildrenset(b'a/b/c/d/e'), set())
        self.assertEqual(m.visitchildrenset(b'folder'), set())


class DifferenceMatcherTests(unittest.TestCase):
    def testVisitdirM2always(self):
        m1 = matchmod.alwaysmatcher()
        m2 = matchmod.alwaysmatcher()
        dm = matchmod.differencematcher(m1, m2)
        # dm should be equivalent to a nevermatcher.
        self.assertFalse(dm.visitdir(b''))
        self.assertFalse(dm.visitdir(b'dir'))
        self.assertFalse(dm.visitdir(b'dir/subdir'))
        self.assertFalse(dm.visitdir(b'dir/subdir/z'))
        self.assertFalse(dm.visitdir(b'dir/foo'))
        self.assertFalse(dm.visitdir(b'dir/subdir/x'))
        self.assertFalse(dm.visitdir(b'folder'))

    def testVisitchildrensetM2always(self):
        m1 = matchmod.alwaysmatcher()
        m2 = matchmod.alwaysmatcher()
        dm = matchmod.differencematcher(m1, m2)
        # dm should be equivalent to a nevermatcher.
        self.assertEqual(dm.visitchildrenset(b''), set())
        self.assertEqual(dm.visitchildrenset(b'dir'), set())
        self.assertEqual(dm.visitchildrenset(b'dir/subdir'), set())
        self.assertEqual(dm.visitchildrenset(b'dir/subdir/z'), set())
        self.assertEqual(dm.visitchildrenset(b'dir/foo'), set())
        self.assertEqual(dm.visitchildrenset(b'dir/subdir/x'), set())
        self.assertEqual(dm.visitchildrenset(b'folder'), set())

    def testVisitdirM2never(self):
        m1 = matchmod.alwaysmatcher()
        m2 = matchmod.nevermatcher()
        dm = matchmod.differencematcher(m1, m2)
        # dm should be equivalent to a alwaysmatcher.
        #
        # We're testing Equal-to-True instead of just 'assertTrue' since
        # assertTrue does NOT verify that it's a bool, just that it's truthy.
        # While we may want to eventually make these return 'all', they should
        # not currently do so.
        self.assertEqual(dm.visitdir(b''), b'all')
        self.assertEqual(dm.visitdir(b'dir'), b'all')
        self.assertEqual(dm.visitdir(b'dir/subdir'), b'all')
        self.assertEqual(dm.visitdir(b'dir/subdir/z'), b'all')
        self.assertEqual(dm.visitdir(b'dir/foo'), b'all')
        self.assertEqual(dm.visitdir(b'dir/subdir/x'), b'all')
        self.assertEqual(dm.visitdir(b'folder'), b'all')

    def testVisitchildrensetM2never(self):
        m1 = matchmod.alwaysmatcher()
        m2 = matchmod.nevermatcher()
        dm = matchmod.differencematcher(m1, m2)
        # dm should be equivalent to a alwaysmatcher.
        self.assertEqual(dm.visitchildrenset(b''), b'all')
        self.assertEqual(dm.visitchildrenset(b'dir'), b'all')
        self.assertEqual(dm.visitchildrenset(b'dir/subdir'), b'all')
        self.assertEqual(dm.visitchildrenset(b'dir/subdir/z'), b'all')
        self.assertEqual(dm.visitchildrenset(b'dir/foo'), b'all')
        self.assertEqual(dm.visitchildrenset(b'dir/subdir/x'), b'all')
        self.assertEqual(dm.visitchildrenset(b'folder'), b'all')

    def testVisitdirM2SubdirPrefix(self):
        m1 = matchmod.alwaysmatcher()
        m2 = matchmod.match(
            util.localpath(b'/repo'), b'', patterns=[b'path:dir/subdir']
        )
        dm = matchmod.differencematcher(m1, m2)
        self.assertEqual(dm.visitdir(b''), True)
        self.assertEqual(dm.visitdir(b'dir'), True)
        self.assertFalse(dm.visitdir(b'dir/subdir'))
        # OPT: We should probably return False for these; we don't because
        # patternmatcher.visitdir() (our m2) doesn't return 'all' for subdirs of
        # an 'all' pattern, just True.
        self.assertEqual(dm.visitdir(b'dir/subdir/z'), True)
        self.assertEqual(dm.visitdir(b'dir/subdir/x'), True)
        self.assertEqual(dm.visitdir(b'dir/foo'), b'all')
        self.assertEqual(dm.visitdir(b'folder'), b'all')

    def testVisitchildrensetM2SubdirPrefix(self):
        m1 = matchmod.alwaysmatcher()
        m2 = matchmod.match(
            util.localpath(b'/repo'), b'', patterns=[b'path:dir/subdir']
        )
        dm = matchmod.differencematcher(m1, m2)
        self.assertEqual(dm.visitchildrenset(b''), b'this')
        self.assertEqual(dm.visitchildrenset(b'dir'), b'this')
        self.assertEqual(dm.visitchildrenset(b'dir/subdir'), set())
        self.assertEqual(dm.visitchildrenset(b'dir/foo'), b'all')
        self.assertEqual(dm.visitchildrenset(b'folder'), b'all')
        # OPT: We should probably return set() for these; we don't because
        # patternmatcher.visitdir() (our m2) doesn't return 'all' for subdirs of
        # an 'all' pattern, just 'this'.
        self.assertEqual(dm.visitchildrenset(b'dir/subdir/z'), b'this')
        self.assertEqual(dm.visitchildrenset(b'dir/subdir/x'), b'this')

    # We're using includematcher instead of patterns because it behaves slightly
    # better (giving narrower results) than patternmatcher.
    def testVisitdirIncludeInclude(self):
        m1 = matchmod.match(
            util.localpath(b'/repo'), b'', include=[b'path:dir/subdir']
        )
        m2 = matchmod.match(
            util.localpath(b'/repo'), b'', include=[b'rootfilesin:dir']
        )
        dm = matchmod.differencematcher(m1, m2)
        self.assertEqual(dm.visitdir(b''), True)
        self.assertEqual(dm.visitdir(b'dir'), True)
        self.assertEqual(dm.visitdir(b'dir/subdir'), b'all')
        self.assertFalse(dm.visitdir(b'dir/foo'))
        self.assertFalse(dm.visitdir(b'folder'))
        # OPT: We should probably return False for these; we don't because
        # patternmatcher.visitdir() (our m2) doesn't return 'all' for subdirs of
        # an 'all' pattern, just True.
        self.assertEqual(dm.visitdir(b'dir/subdir/z'), True)
        self.assertEqual(dm.visitdir(b'dir/subdir/x'), True)

    def testVisitchildrensetIncludeInclude(self):
        m1 = matchmod.match(
            util.localpath(b'/repo'), b'', include=[b'path:dir/subdir']
        )
        m2 = matchmod.match(
            util.localpath(b'/repo'), b'', include=[b'rootfilesin:dir']
        )
        dm = matchmod.differencematcher(m1, m2)
        self.assertEqual(dm.visitchildrenset(b''), {b'dir'})
        self.assertEqual(dm.visitchildrenset(b'dir'), {b'subdir'})
        self.assertEqual(dm.visitchildrenset(b'dir/subdir'), b'all')
        self.assertEqual(dm.visitchildrenset(b'dir/foo'), set())
        self.assertEqual(dm.visitchildrenset(b'folder'), set())
        # OPT: We should probably return set() for these; we don't because
        # patternmatcher.visitdir() (our m2) doesn't return 'all' for subdirs of
        # an 'all' pattern, just 'this'.
        self.assertEqual(dm.visitchildrenset(b'dir/subdir/z'), b'this')
        self.assertEqual(dm.visitchildrenset(b'dir/subdir/x'), b'this')


class IntersectionMatcherTests(unittest.TestCase):
    def testVisitdirM2always(self):
        m1 = matchmod.alwaysmatcher()
        m2 = matchmod.alwaysmatcher()
        im = matchmod.intersectmatchers(m1, m2)
        # im should be equivalent to a alwaysmatcher.
        self.assertEqual(im.visitdir(b''), b'all')
        self.assertEqual(im.visitdir(b'dir'), b'all')
        self.assertEqual(im.visitdir(b'dir/subdir'), b'all')
        self.assertEqual(im.visitdir(b'dir/subdir/z'), b'all')
        self.assertEqual(im.visitdir(b'dir/foo'), b'all')
        self.assertEqual(im.visitdir(b'dir/subdir/x'), b'all')
        self.assertEqual(im.visitdir(b'folder'), b'all')

    def testVisitchildrensetM2always(self):
        m1 = matchmod.alwaysmatcher()
        m2 = matchmod.alwaysmatcher()
        im = matchmod.intersectmatchers(m1, m2)
        # im should be equivalent to a alwaysmatcher.
        self.assertEqual(im.visitchildrenset(b''), b'all')
        self.assertEqual(im.visitchildrenset(b'dir'), b'all')
        self.assertEqual(im.visitchildrenset(b'dir/subdir'), b'all')
        self.assertEqual(im.visitchildrenset(b'dir/subdir/z'), b'all')
        self.assertEqual(im.visitchildrenset(b'dir/foo'), b'all')
        self.assertEqual(im.visitchildrenset(b'dir/subdir/x'), b'all')
        self.assertEqual(im.visitchildrenset(b'folder'), b'all')

    def testVisitdirM2never(self):
        m1 = matchmod.alwaysmatcher()
        m2 = matchmod.nevermatcher()
        im = matchmod.intersectmatchers(m1, m2)
        # im should be equivalent to a nevermatcher.
        self.assertFalse(im.visitdir(b''))
        self.assertFalse(im.visitdir(b'dir'))
        self.assertFalse(im.visitdir(b'dir/subdir'))
        self.assertFalse(im.visitdir(b'dir/subdir/z'))
        self.assertFalse(im.visitdir(b'dir/foo'))
        self.assertFalse(im.visitdir(b'dir/subdir/x'))
        self.assertFalse(im.visitdir(b'folder'))

    def testVisitchildrensetM2never(self):
        m1 = matchmod.alwaysmatcher()
        m2 = matchmod.nevermatcher()
        im = matchmod.intersectmatchers(m1, m2)
        # im should be equivalent to a nevermqtcher.
        self.assertEqual(im.visitchildrenset(b''), set())
        self.assertEqual(im.visitchildrenset(b'dir'), set())
        self.assertEqual(im.visitchildrenset(b'dir/subdir'), set())
        self.assertEqual(im.visitchildrenset(b'dir/subdir/z'), set())
        self.assertEqual(im.visitchildrenset(b'dir/foo'), set())
        self.assertEqual(im.visitchildrenset(b'dir/subdir/x'), set())
        self.assertEqual(im.visitchildrenset(b'folder'), set())

    def testVisitdirM2SubdirPrefix(self):
        m1 = matchmod.alwaysmatcher()
        m2 = matchmod.match(
            util.localpath(b'/repo'), b'', patterns=[b'path:dir/subdir']
        )
        im = matchmod.intersectmatchers(m1, m2)
        self.assertEqual(im.visitdir(b''), True)
        self.assertEqual(im.visitdir(b'dir'), True)
        self.assertEqual(im.visitdir(b'dir/subdir'), b'all')
        self.assertFalse(im.visitdir(b'dir/foo'))
        self.assertFalse(im.visitdir(b'folder'))
        # OPT: We should probably return 'all' for these; we don't because
        # patternmatcher.visitdir() (our m2) doesn't return 'all' for subdirs of
        # an 'all' pattern, just True.
        self.assertEqual(im.visitdir(b'dir/subdir/z'), True)
        self.assertEqual(im.visitdir(b'dir/subdir/x'), True)

    def testVisitchildrensetM2SubdirPrefix(self):
        m1 = matchmod.alwaysmatcher()
        m2 = matchmod.match(
            util.localpath(b'/repo'), b'', include=[b'path:dir/subdir']
        )
        im = matchmod.intersectmatchers(m1, m2)
        self.assertEqual(im.visitchildrenset(b''), {b'dir'})
        self.assertEqual(im.visitchildrenset(b'dir'), {b'subdir'})
        self.assertEqual(im.visitchildrenset(b'dir/subdir'), b'all')
        self.assertEqual(im.visitchildrenset(b'dir/foo'), set())
        self.assertEqual(im.visitchildrenset(b'folder'), set())
        # OPT: We should probably return 'all' for these
        self.assertEqual(im.visitchildrenset(b'dir/subdir/z'), b'this')
        self.assertEqual(im.visitchildrenset(b'dir/subdir/x'), b'this')

    # We're using includematcher instead of patterns because it behaves slightly
    # better (giving narrower results) than patternmatcher.
    def testVisitdirIncludeInclude(self):
        m1 = matchmod.match(
            util.localpath(b'/repo'), b'', include=[b'path:dir/subdir']
        )
        m2 = matchmod.match(
            util.localpath(b'/repo'), b'', include=[b'rootfilesin:dir']
        )
        im = matchmod.intersectmatchers(m1, m2)
        self.assertEqual(im.visitdir(b''), True)
        self.assertEqual(im.visitdir(b'dir'), True)
        self.assertFalse(im.visitdir(b'dir/subdir'))
        self.assertFalse(im.visitdir(b'dir/foo'))
        self.assertFalse(im.visitdir(b'folder'))
        self.assertFalse(im.visitdir(b'dir/subdir/z'))
        self.assertFalse(im.visitdir(b'dir/subdir/x'))

    def testVisitchildrensetIncludeInclude(self):
        m1 = matchmod.match(
            util.localpath(b'/repo'), b'', include=[b'path:dir/subdir']
        )
        m2 = matchmod.match(
            util.localpath(b'/repo'), b'', include=[b'rootfilesin:dir']
        )
        im = matchmod.intersectmatchers(m1, m2)
        self.assertEqual(im.visitchildrenset(b''), {b'dir'})
        self.assertEqual(im.visitchildrenset(b'dir'), b'this')
        self.assertEqual(im.visitchildrenset(b'dir/subdir'), set())
        self.assertEqual(im.visitchildrenset(b'dir/foo'), set())
        self.assertEqual(im.visitchildrenset(b'folder'), set())
        self.assertEqual(im.visitchildrenset(b'dir/subdir/z'), set())
        self.assertEqual(im.visitchildrenset(b'dir/subdir/x'), set())

    # We're using includematcher instead of patterns because it behaves slightly
    # better (giving narrower results) than patternmatcher.
    def testVisitdirIncludeInclude2(self):
        m1 = matchmod.match(
            util.localpath(b'/repo'), b'', include=[b'path:dir/subdir']
        )
        m2 = matchmod.match(
            util.localpath(b'/repo'), b'', include=[b'path:folder']
        )
        im = matchmod.intersectmatchers(m1, m2)
        # FIXME: is True correct here?
        self.assertEqual(im.visitdir(b''), True)
        self.assertFalse(im.visitdir(b'dir'))
        self.assertFalse(im.visitdir(b'dir/subdir'))
        self.assertFalse(im.visitdir(b'dir/foo'))
        self.assertFalse(im.visitdir(b'folder'))
        self.assertFalse(im.visitdir(b'dir/subdir/z'))
        self.assertFalse(im.visitdir(b'dir/subdir/x'))

    def testVisitchildrensetIncludeInclude2(self):
        m1 = matchmod.match(
            util.localpath(b'/repo'), b'', include=[b'path:dir/subdir']
        )
        m2 = matchmod.match(
            util.localpath(b'/repo'), b'', include=[b'path:folder']
        )
        im = matchmod.intersectmatchers(m1, m2)
        # FIXME: is set() correct here?
        self.assertEqual(im.visitchildrenset(b''), set())
        self.assertEqual(im.visitchildrenset(b'dir'), set())
        self.assertEqual(im.visitchildrenset(b'dir/subdir'), set())
        self.assertEqual(im.visitchildrenset(b'dir/foo'), set())
        self.assertEqual(im.visitchildrenset(b'folder'), set())
        self.assertEqual(im.visitchildrenset(b'dir/subdir/z'), set())
        self.assertEqual(im.visitchildrenset(b'dir/subdir/x'), set())

    # We're using includematcher instead of patterns because it behaves slightly
    # better (giving narrower results) than patternmatcher.
    def testVisitdirIncludeInclude3(self):
        m1 = matchmod.match(
            util.localpath(b'/repo'), b'', include=[b'path:dir/subdir/x']
        )
        m2 = matchmod.match(
            util.localpath(b'/repo'), b'', include=[b'path:dir/subdir']
        )
        im = matchmod.intersectmatchers(m1, m2)
        self.assertEqual(im.visitdir(b''), True)
        self.assertEqual(im.visitdir(b'dir'), True)
        self.assertEqual(im.visitdir(b'dir/subdir'), True)
        self.assertFalse(im.visitdir(b'dir/foo'))
        self.assertFalse(im.visitdir(b'folder'))
        self.assertFalse(im.visitdir(b'dir/subdir/z'))
        # OPT: this should probably be 'all' not True.
        self.assertEqual(im.visitdir(b'dir/subdir/x'), True)

    def testVisitchildrensetIncludeInclude3(self):
        m1 = matchmod.match(
            util.localpath(b'/repo'), b'', include=[b'path:dir/subdir/x']
        )
        m2 = matchmod.match(
            util.localpath(b'/repo'), b'', include=[b'path:dir/subdir']
        )
        im = matchmod.intersectmatchers(m1, m2)
        self.assertEqual(im.visitchildrenset(b''), {b'dir'})
        self.assertEqual(im.visitchildrenset(b'dir'), {b'subdir'})
        self.assertEqual(im.visitchildrenset(b'dir/subdir'), {b'x'})
        self.assertEqual(im.visitchildrenset(b'dir/foo'), set())
        self.assertEqual(im.visitchildrenset(b'folder'), set())
        self.assertEqual(im.visitchildrenset(b'dir/subdir/z'), set())
        # OPT: this should probably be 'all' not 'this'.
        self.assertEqual(im.visitchildrenset(b'dir/subdir/x'), b'this')

    # We're using includematcher instead of patterns because it behaves slightly
    # better (giving narrower results) than patternmatcher.
    def testVisitdirIncludeInclude4(self):
        m1 = matchmod.match(
            util.localpath(b'/repo'), b'', include=[b'path:dir/subdir/x']
        )
        m2 = matchmod.match(
            util.localpath(b'/repo'), b'', include=[b'path:dir/subdir/z']
        )
        im = matchmod.intersectmatchers(m1, m2)
        # OPT: these next three could probably be False as well.
        self.assertEqual(im.visitdir(b''), True)
        self.assertEqual(im.visitdir(b'dir'), True)
        self.assertEqual(im.visitdir(b'dir/subdir'), True)
        self.assertFalse(im.visitdir(b'dir/foo'))
        self.assertFalse(im.visitdir(b'folder'))
        self.assertFalse(im.visitdir(b'dir/subdir/z'))
        self.assertFalse(im.visitdir(b'dir/subdir/x'))

    def testVisitchildrensetIncludeInclude4(self):
        m1 = matchmod.match(
            util.localpath(b'/repo'), b'', include=[b'path:dir/subdir/x']
        )
        m2 = matchmod.match(
            util.localpath(b'/repo'), b'', include=[b'path:dir/subdir/z']
        )
        im = matchmod.intersectmatchers(m1, m2)
        # OPT: these next two could probably be set() as well.
        self.assertEqual(im.visitchildrenset(b''), {b'dir'})
        self.assertEqual(im.visitchildrenset(b'dir'), {b'subdir'})
        self.assertEqual(im.visitchildrenset(b'dir/subdir'), set())
        self.assertEqual(im.visitchildrenset(b'dir/foo'), set())
        self.assertEqual(im.visitchildrenset(b'folder'), set())
        self.assertEqual(im.visitchildrenset(b'dir/subdir/z'), set())
        self.assertEqual(im.visitchildrenset(b'dir/subdir/x'), set())


class UnionMatcherTests(unittest.TestCase):
    def testVisitdirM2always(self):
        m1 = matchmod.alwaysmatcher()
        m2 = matchmod.alwaysmatcher()
        um = matchmod.unionmatcher([m1, m2])
        # um should be equivalent to a alwaysmatcher.
        self.assertEqual(um.visitdir(b''), b'all')
        self.assertEqual(um.visitdir(b'dir'), b'all')
        self.assertEqual(um.visitdir(b'dir/subdir'), b'all')
        self.assertEqual(um.visitdir(b'dir/subdir/z'), b'all')
        self.assertEqual(um.visitdir(b'dir/foo'), b'all')
        self.assertEqual(um.visitdir(b'dir/subdir/x'), b'all')
        self.assertEqual(um.visitdir(b'folder'), b'all')

    def testVisitchildrensetM2always(self):
        m1 = matchmod.alwaysmatcher()
        m2 = matchmod.alwaysmatcher()
        um = matchmod.unionmatcher([m1, m2])
        # um should be equivalent to a alwaysmatcher.
        self.assertEqual(um.visitchildrenset(b''), b'all')
        self.assertEqual(um.visitchildrenset(b'dir'), b'all')
        self.assertEqual(um.visitchildrenset(b'dir/subdir'), b'all')
        self.assertEqual(um.visitchildrenset(b'dir/subdir/z'), b'all')
        self.assertEqual(um.visitchildrenset(b'dir/foo'), b'all')
        self.assertEqual(um.visitchildrenset(b'dir/subdir/x'), b'all')
        self.assertEqual(um.visitchildrenset(b'folder'), b'all')

    def testVisitdirM1never(self):
        m1 = matchmod.nevermatcher()
        m2 = matchmod.alwaysmatcher()
        um = matchmod.unionmatcher([m1, m2])
        # um should be equivalent to a alwaysmatcher.
        self.assertEqual(um.visitdir(b''), b'all')
        self.assertEqual(um.visitdir(b'dir'), b'all')
        self.assertEqual(um.visitdir(b'dir/subdir'), b'all')
        self.assertEqual(um.visitdir(b'dir/subdir/z'), b'all')
        self.assertEqual(um.visitdir(b'dir/foo'), b'all')
        self.assertEqual(um.visitdir(b'dir/subdir/x'), b'all')
        self.assertEqual(um.visitdir(b'folder'), b'all')

    def testVisitchildrensetM1never(self):
        m1 = matchmod.nevermatcher()
        m2 = matchmod.alwaysmatcher()
        um = matchmod.unionmatcher([m1, m2])
        # um should be equivalent to a alwaysmatcher.
        self.assertEqual(um.visitchildrenset(b''), b'all')
        self.assertEqual(um.visitchildrenset(b'dir'), b'all')
        self.assertEqual(um.visitchildrenset(b'dir/subdir'), b'all')
        self.assertEqual(um.visitchildrenset(b'dir/subdir/z'), b'all')
        self.assertEqual(um.visitchildrenset(b'dir/foo'), b'all')
        self.assertEqual(um.visitchildrenset(b'dir/subdir/x'), b'all')
        self.assertEqual(um.visitchildrenset(b'folder'), b'all')

    def testVisitdirM2never(self):
        m1 = matchmod.alwaysmatcher()
        m2 = matchmod.nevermatcher()
        um = matchmod.unionmatcher([m1, m2])
        # um should be equivalent to a alwaysmatcher.
        self.assertEqual(um.visitdir(b''), b'all')
        self.assertEqual(um.visitdir(b'dir'), b'all')
        self.assertEqual(um.visitdir(b'dir/subdir'), b'all')
        self.assertEqual(um.visitdir(b'dir/subdir/z'), b'all')
        self.assertEqual(um.visitdir(b'dir/foo'), b'all')
        self.assertEqual(um.visitdir(b'dir/subdir/x'), b'all')
        self.assertEqual(um.visitdir(b'folder'), b'all')

    def testVisitchildrensetM2never(self):
        m1 = matchmod.alwaysmatcher()
        m2 = matchmod.nevermatcher()
        um = matchmod.unionmatcher([m1, m2])
        # um should be equivalent to a alwaysmatcher.
        self.assertEqual(um.visitchildrenset(b''), b'all')
        self.assertEqual(um.visitchildrenset(b'dir'), b'all')
        self.assertEqual(um.visitchildrenset(b'dir/subdir'), b'all')
        self.assertEqual(um.visitchildrenset(b'dir/subdir/z'), b'all')
        self.assertEqual(um.visitchildrenset(b'dir/foo'), b'all')
        self.assertEqual(um.visitchildrenset(b'dir/subdir/x'), b'all')
        self.assertEqual(um.visitchildrenset(b'folder'), b'all')

    def testVisitdirM2SubdirPrefix(self):
        m1 = matchmod.alwaysmatcher()
        m2 = matchmod.match(
            util.localpath(b'/repo'), b'', patterns=[b'path:dir/subdir']
        )
        um = matchmod.unionmatcher([m1, m2])
        self.assertEqual(um.visitdir(b''), b'all')
        self.assertEqual(um.visitdir(b'dir'), b'all')
        self.assertEqual(um.visitdir(b'dir/subdir'), b'all')
        self.assertEqual(um.visitdir(b'dir/foo'), b'all')
        self.assertEqual(um.visitdir(b'folder'), b'all')
        self.assertEqual(um.visitdir(b'dir/subdir/z'), b'all')
        self.assertEqual(um.visitdir(b'dir/subdir/x'), b'all')

    def testVisitchildrensetM2SubdirPrefix(self):
        m1 = matchmod.alwaysmatcher()
        m2 = matchmod.match(
            util.localpath(b'/repo'), b'', include=[b'path:dir/subdir']
        )
        um = matchmod.unionmatcher([m1, m2])
        self.assertEqual(um.visitchildrenset(b''), b'all')
        self.assertEqual(um.visitchildrenset(b'dir'), b'all')
        self.assertEqual(um.visitchildrenset(b'dir/subdir'), b'all')
        self.assertEqual(um.visitchildrenset(b'dir/foo'), b'all')
        self.assertEqual(um.visitchildrenset(b'folder'), b'all')
        self.assertEqual(um.visitchildrenset(b'dir/subdir/z'), b'all')
        self.assertEqual(um.visitchildrenset(b'dir/subdir/x'), b'all')

    # We're using includematcher instead of patterns because it behaves slightly
    # better (giving narrower results) than patternmatcher.
    def testVisitdirIncludeInclude(self):
        m1 = matchmod.match(
            util.localpath(b'/repo'), b'', include=[b'path:dir/subdir']
        )
        m2 = matchmod.match(
            util.localpath(b'/repo'), b'', include=[b'rootfilesin:dir']
        )
        um = matchmod.unionmatcher([m1, m2])
        self.assertEqual(um.visitdir(b''), True)
        self.assertEqual(um.visitdir(b'dir'), True)
        self.assertEqual(um.visitdir(b'dir/subdir'), b'all')
        self.assertFalse(um.visitdir(b'dir/foo'))
        self.assertFalse(um.visitdir(b'folder'))
        # OPT: These two should probably be 'all' not True.
        self.assertEqual(um.visitdir(b'dir/subdir/z'), True)
        self.assertEqual(um.visitdir(b'dir/subdir/x'), True)

    def testVisitchildrensetIncludeInclude(self):
        m1 = matchmod.match(
            util.localpath(b'/repo'), b'', include=[b'path:dir/subdir']
        )
        m2 = matchmod.match(
            util.localpath(b'/repo'), b'', include=[b'rootfilesin:dir']
        )
        um = matchmod.unionmatcher([m1, m2])
        self.assertEqual(um.visitchildrenset(b''), {b'dir'})
        self.assertEqual(um.visitchildrenset(b'dir'), b'this')
        self.assertEqual(um.visitchildrenset(b'dir/subdir'), b'all')
        self.assertEqual(um.visitchildrenset(b'dir/foo'), set())
        self.assertEqual(um.visitchildrenset(b'folder'), set())
        # OPT: These next two could be 'all' instead of 'this'.
        self.assertEqual(um.visitchildrenset(b'dir/subdir/z'), b'this')
        self.assertEqual(um.visitchildrenset(b'dir/subdir/x'), b'this')

    # We're using includematcher instead of patterns because it behaves slightly
    # better (giving narrower results) than patternmatcher.
    def testVisitdirIncludeInclude2(self):
        m1 = matchmod.match(
            util.localpath(b'/repo'), b'', include=[b'path:dir/subdir']
        )
        m2 = matchmod.match(
            util.localpath(b'/repo'), b'', include=[b'path:folder']
        )
        um = matchmod.unionmatcher([m1, m2])
        self.assertEqual(um.visitdir(b''), True)
        self.assertEqual(um.visitdir(b'dir'), True)
        self.assertEqual(um.visitdir(b'dir/subdir'), b'all')
        self.assertFalse(um.visitdir(b'dir/foo'))
        self.assertEqual(um.visitdir(b'folder'), b'all')
        # OPT: These should probably be 'all' not True.
        self.assertEqual(um.visitdir(b'dir/subdir/z'), True)
        self.assertEqual(um.visitdir(b'dir/subdir/x'), True)

    def testVisitchildrensetIncludeInclude2(self):
        m1 = matchmod.match(
            util.localpath(b'/repo'), b'', include=[b'path:dir/subdir']
        )
        m2 = matchmod.match(
            util.localpath(b'/repo'), b'', include=[b'path:folder']
        )
        um = matchmod.unionmatcher([m1, m2])
        self.assertEqual(um.visitchildrenset(b''), {b'folder', b'dir'})
        self.assertEqual(um.visitchildrenset(b'dir'), {b'subdir'})
        self.assertEqual(um.visitchildrenset(b'dir/subdir'), b'all')
        self.assertEqual(um.visitchildrenset(b'dir/foo'), set())
        self.assertEqual(um.visitchildrenset(b'folder'), b'all')
        # OPT: These next two could be 'all' instead of 'this'.
        self.assertEqual(um.visitchildrenset(b'dir/subdir/z'), b'this')
        self.assertEqual(um.visitchildrenset(b'dir/subdir/x'), b'this')

    # We're using includematcher instead of patterns because it behaves slightly
    # better (giving narrower results) than patternmatcher.
    def testVisitdirIncludeInclude3(self):
        m1 = matchmod.match(
            util.localpath(b'/repo'), b'', include=[b'path:dir/subdir/x']
        )
        m2 = matchmod.match(
            util.localpath(b'/repo'), b'', include=[b'path:dir/subdir']
        )
        um = matchmod.unionmatcher([m1, m2])
        self.assertEqual(um.visitdir(b''), True)
        self.assertEqual(um.visitdir(b'dir'), True)
        self.assertEqual(um.visitdir(b'dir/subdir'), b'all')
        self.assertFalse(um.visitdir(b'dir/foo'))
        self.assertFalse(um.visitdir(b'folder'))
        self.assertEqual(um.visitdir(b'dir/subdir/x'), b'all')
        # OPT: this should probably be 'all' not True.
        self.assertEqual(um.visitdir(b'dir/subdir/z'), True)

    def testVisitchildrensetIncludeInclude3(self):
        m1 = matchmod.match(
            util.localpath(b'/repo'), b'', include=[b'path:dir/subdir/x']
        )
        m2 = matchmod.match(
            util.localpath(b'/repo'), b'', include=[b'path:dir/subdir']
        )
        um = matchmod.unionmatcher([m1, m2])
        self.assertEqual(um.visitchildrenset(b''), {b'dir'})
        self.assertEqual(um.visitchildrenset(b'dir'), {b'subdir'})
        self.assertEqual(um.visitchildrenset(b'dir/subdir'), b'all')
        self.assertEqual(um.visitchildrenset(b'dir/foo'), set())
        self.assertEqual(um.visitchildrenset(b'folder'), set())
        self.assertEqual(um.visitchildrenset(b'dir/subdir/x'), b'all')
        # OPT: this should probably be 'all' not 'this'.
        self.assertEqual(um.visitchildrenset(b'dir/subdir/z'), b'this')

    # We're using includematcher instead of patterns because it behaves slightly
    # better (giving narrower results) than patternmatcher.
    def testVisitdirIncludeInclude4(self):
        m1 = matchmod.match(
            util.localpath(b'/repo'), b'', include=[b'path:dir/subdir/x']
        )
        m2 = matchmod.match(
            util.localpath(b'/repo'), b'', include=[b'path:dir/subdir/z']
        )
        um = matchmod.unionmatcher([m1, m2])
        # OPT: these next three could probably be False as well.
        self.assertEqual(um.visitdir(b''), True)
        self.assertEqual(um.visitdir(b'dir'), True)
        self.assertEqual(um.visitdir(b'dir/subdir'), True)
        self.assertFalse(um.visitdir(b'dir/foo'))
        self.assertFalse(um.visitdir(b'folder'))
        self.assertEqual(um.visitdir(b'dir/subdir/z'), b'all')
        self.assertEqual(um.visitdir(b'dir/subdir/x'), b'all')

    def testVisitchildrensetIncludeInclude4(self):
        m1 = matchmod.match(
            util.localpath(b'/repo'), b'', include=[b'path:dir/subdir/x']
        )
        m2 = matchmod.match(
            util.localpath(b'/repo'), b'', include=[b'path:dir/subdir/z']
        )
        um = matchmod.unionmatcher([m1, m2])
        self.assertEqual(um.visitchildrenset(b''), {b'dir'})
        self.assertEqual(um.visitchildrenset(b'dir'), {b'subdir'})
        self.assertEqual(um.visitchildrenset(b'dir/subdir'), {b'x', b'z'})
        self.assertEqual(um.visitchildrenset(b'dir/foo'), set())
        self.assertEqual(um.visitchildrenset(b'folder'), set())
        self.assertEqual(um.visitchildrenset(b'dir/subdir/z'), b'all')
        self.assertEqual(um.visitchildrenset(b'dir/subdir/x'), b'all')


class SubdirMatcherTests(unittest.TestCase):
    def testVisitdir(self):
        m = matchmod.match(
            util.localpath(b'/repo'), b'', include=[b'path:dir/subdir']
        )
        sm = matchmod.subdirmatcher(b'dir', m)

        self.assertEqual(sm.visitdir(b''), True)
        self.assertEqual(sm.visitdir(b'subdir'), b'all')
        # OPT: These next two should probably be 'all' not True.
        self.assertEqual(sm.visitdir(b'subdir/x'), True)
        self.assertEqual(sm.visitdir(b'subdir/z'), True)
        self.assertFalse(sm.visitdir(b'foo'))

    def testVisitchildrenset(self):
        m = matchmod.match(
            util.localpath(b'/repo'), b'', include=[b'path:dir/subdir']
        )
        sm = matchmod.subdirmatcher(b'dir', m)

        self.assertEqual(sm.visitchildrenset(b''), {b'subdir'})
        self.assertEqual(sm.visitchildrenset(b'subdir'), b'all')
        # OPT: These next two should probably be 'all' not 'this'.
        self.assertEqual(sm.visitchildrenset(b'subdir/x'), b'this')
        self.assertEqual(sm.visitchildrenset(b'subdir/z'), b'this')
        self.assertEqual(sm.visitchildrenset(b'foo'), set())


class PrefixdirMatcherTests(unittest.TestCase):
    def testVisitdir(self):
        m = matchmod.match(
            util.localpath(b'/root/d'),
            b'e/f',
            [b'../a.txt', b'b.txt'],
            auditor=noop_auditor,
        )
        pm = matchmod.prefixdirmatcher(b'd', m)

        # `m` elides 'd' because it's part of the root, and the rest of the
        # patterns are relative.
        self.assertEqual(bool(m(b'a.txt')), False)
        self.assertEqual(bool(m(b'b.txt')), False)
        self.assertEqual(bool(m(b'e/a.txt')), True)
        self.assertEqual(bool(m(b'e/b.txt')), False)
        self.assertEqual(bool(m(b'e/f/b.txt')), True)

        # The prefix matcher re-adds 'd' to the paths, so they need to be
        # specified when using the prefixdirmatcher.
        self.assertEqual(bool(pm(b'a.txt')), False)
        self.assertEqual(bool(pm(b'b.txt')), False)
        self.assertEqual(bool(pm(b'd/e/a.txt')), True)
        self.assertEqual(bool(pm(b'd/e/b.txt')), False)
        self.assertEqual(bool(pm(b'd/e/f/b.txt')), True)

        self.assertEqual(m.visitdir(b''), True)
        self.assertEqual(m.visitdir(b'e'), True)
        self.assertEqual(m.visitdir(b'e/f'), True)
        self.assertEqual(m.visitdir(b'e/f/g'), False)

        self.assertEqual(pm.visitdir(b''), True)
        self.assertEqual(pm.visitdir(b'd'), True)
        self.assertEqual(pm.visitdir(b'd/e'), True)
        self.assertEqual(pm.visitdir(b'd/e/f'), True)
        self.assertEqual(pm.visitdir(b'd/e/f/g'), False)

    def testVisitchildrenset(self):
        m = matchmod.match(
            util.localpath(b'/root/d'),
            b'e/f',
            [b'../a.txt', b'b.txt'],
            auditor=noop_auditor,
        )
        pm = matchmod.prefixdirmatcher(b'd', m)

        # OPT: visitchildrenset could possibly return {'e'} and {'f'} for these
        # next two, respectively; patternmatcher does not have this
        # optimization.
        self.assertEqual(m.visitchildrenset(b''), b'this')
        self.assertEqual(m.visitchildrenset(b'e'), b'this')
        self.assertEqual(m.visitchildrenset(b'e/f'), b'this')
        self.assertEqual(m.visitchildrenset(b'e/f/g'), set())

        # OPT: visitchildrenset could possibly return {'d'}, {'e'}, and {'f'}
        # for these next three, respectively; patternmatcher does not have this
        # optimization.
        self.assertEqual(pm.visitchildrenset(b''), b'this')
        self.assertEqual(pm.visitchildrenset(b'd'), b'this')
        self.assertEqual(pm.visitchildrenset(b'd/e'), b'this')
        self.assertEqual(pm.visitchildrenset(b'd/e/f'), b'this')
        self.assertEqual(pm.visitchildrenset(b'd/e/f/g'), set())


if __name__ == '__main__':
    silenttestrunner.main(__name__)