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# This module is part of GitDB and is released under

# the New BSD License: https://opensource.org/license/bsd-3-clause/

from gitdb.test.db.lib import (

TestDBBase,

with_rw_directory,

)

from gitdb.db import ReferenceDB

from gitdb.util import (

NULL_BIN_SHA,

hex_to_bin

)

import os

class TestReferenceDB(TestDBBase):

def make_alt_file(self, alt_path, alt_list):

"""Create an alternates file which contains the given alternates.

The list can be empty"""

with open(alt_path, "wb") as alt_file:

for alt in alt_list:

alt_file.write(alt.encode("utf-8") + b"\n")

@with_rw_directory

def test_writing(self, path):

alt_path = os.path.join(path, 'alternates')

rdb = ReferenceDB(alt_path)

assert len(rdb.databases()) == 0

assert rdb.size() == 0

assert len(list(rdb.sha_iter())) == 0

# try empty, non-existing

assert not rdb.has_object(NULL_BIN_SHA)

# setup alternate file

# add two, one is invalid

own_repo_path = os.path.join(self.gitrepopath, 'objects') # use own repo

self.make_alt_file(alt_path, [own_repo_path, "invalid/path"])

rdb.update_cache()

assert len(rdb.databases()) == 1

# we should now find a default revision of ours

gitdb_sha = next(rdb.sha_iter())

assert rdb.has_object(gitdb_sha)

# remove valid

self.make_alt_file(alt_path, ["just/one/invalid/path"])

rdb.update_cache()

assert len(rdb.databases()) == 0

# add valid

self.make_alt_file(alt_path, [own_repo_path])

rdb.update_cache()

assert len(rdb.databases()) == 1

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