dulwich/tests/test_objectspec.py

# test_objectspec.py -- tests for objectspec.py
# Copyright (C) 2014 Jelmer Vernooij <jelmer@jelmer.uk>
#
# SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
# Dulwich is dual-licensed under the Apache License, Version 2.0 and the GNU
# General Public License as published by the Free Software Foundation; version 2.0
# or (at your option) any later version. You can redistribute it and/or
# modify it under the terms of either of these two licenses.
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# You should have received a copy of the licenses; if not, see
# <http://www.gnu.org/licenses/> for a copy of the GNU General Public License
# and <http://www.apache.org/licenses/LICENSE-2.0> for a copy of the Apache
# License, Version 2.0.
#

"""Tests for revision spec parsing."""

# TODO: Round-trip parse-serialize-parse and serialize-parse-serialize tests.

from dulwich.objects import Blob, Commit, Tag, Tree
from dulwich.objectspec import (
    parse_commit,
    parse_commit_range,
    parse_object,
    parse_ref,
    parse_refs,
    parse_reftuple,
    parse_reftuples,
    parse_tree,
)
from dulwich.repo import MemoryRepo
from dulwich.tests.utils import build_commit_graph

from . import TestCase


class ParseObjectTests(TestCase):
    """Test parse_object."""

    def test_nonexistent(self) -> None:
        r = MemoryRepo()
        self.addCleanup(r.close)
        self.assertRaises(KeyError, parse_object, r, "thisdoesnotexist")

    def test_blob_by_sha(self) -> None:
        r = MemoryRepo()
        self.addCleanup(r.close)
        b = Blob.from_string(b"Blah")
        r.object_store.add_object(b)
        self.assertEqual(b, parse_object(r, b.id))

    def test_parent_caret(self) -> None:
        r = MemoryRepo()
        self.addCleanup(r.close)
        c1, c2, c3 = build_commit_graph(r.object_store, [[1], [2, 1], [3, 1, 2]])
        # c3's parents are [c1, c2]
        self.assertEqual(c1, parse_object(r, c3.id + b"^1"))
        self.assertEqual(c1, parse_object(r, c3.id + b"^"))  # ^ defaults to ^1
        self.assertEqual(c2, parse_object(r, c3.id + b"^2"))

    def test_parent_tilde(self) -> None:
        r = MemoryRepo()
        self.addCleanup(r.close)
        c1, c2, c3 = build_commit_graph(r.object_store, [[1], [2, 1], [3, 2]])
        self.assertEqual(c2, parse_object(r, c3.id + b"~"))
        self.assertEqual(c2, parse_object(r, c3.id + b"~1"))
        self.assertEqual(c1, parse_object(r, c3.id + b"~2"))

    def test_combined_operators(self) -> None:
        r = MemoryRepo()
        self.addCleanup(r.close)
        c1, c2, _c3, c4 = build_commit_graph(
            r.object_store, [[1], [2, 1], [3, 1, 2], [4, 3]]
        )
        # c4~1^2 means: go back 1 generation from c4 (to c3), then take its 2nd parent
        # c3's parents are [c1, c2], so ^2 is c2
        self.assertEqual(c2, parse_object(r, c4.id + b"~1^2"))
        self.assertEqual(c1, parse_object(r, c4.id + b"~^"))

    def test_with_ref(self) -> None:
        r = MemoryRepo()
        self.addCleanup(r.close)
        c1, c2, c3 = build_commit_graph(r.object_store, [[1], [2, 1], [3, 2]])
        r.refs[b"refs/heads/master"] = c3.id
        self.assertEqual(c2, parse_object(r, b"master~"))
        self.assertEqual(c1, parse_object(r, b"master~2"))

    def test_caret_zero(self) -> None:
        r = MemoryRepo()
        self.addCleanup(r.close)
        c1, c2 = build_commit_graph(r.object_store, [[1], [2, 1]])
        # ^0 means the commit itself
        self.assertEqual(c2, parse_object(r, c2.id + b"^0"))
        self.assertEqual(c1, parse_object(r, c2.id + b"~^0"))

    def test_missing_parent(self) -> None:
        r = MemoryRepo()
        self.addCleanup(r.close)
        c1, c2 = build_commit_graph(r.object_store, [[1], [2, 1]])
        # c2 only has 1 parent, so ^2 should fail
        self.assertRaises(ValueError, parse_object, r, c2.id + b"^2")
        # c1 has no parents, so ~ should fail
        self.assertRaises(ValueError, parse_object, r, c1.id + b"~")

    def test_empty_base(self) -> None:
        r = MemoryRepo()
        self.addCleanup(r.close)
        self.assertRaises(ValueError, parse_object, r, b"~1")
        self.assertRaises(ValueError, parse_object, r, b"^1")

    def test_non_commit_with_operators(self) -> None:
        r = MemoryRepo()
        self.addCleanup(r.close)
        b = Blob.from_string(b"Blah")
        r.object_store.add_object(b)
        # Can't apply ~ or ^ to a blob
        self.assertRaises(ValueError, parse_object, r, b.id + b"~1")

    def test_tag_dereference(self) -> None:
        r = MemoryRepo()
        self.addCleanup(r.close)
        [c1] = build_commit_graph(r.object_store, [[1]])
        # Create an annotated tag
        tag = Tag()
        tag.name = b"v1.0"
        tag.message = b"Test tag"
        tag.tag_time = 1234567890
        tag.tag_timezone = 0
        tag.object = (Commit, c1.id)
        tag.tagger = b"Test Tagger <test@example.com>"
        r.object_store.add_object(tag)
        # ^{} dereferences the tag
        self.assertEqual(c1, parse_object(r, tag.id + b"^{}"))

    def test_nested_tag_dereference(self) -> None:
        r = MemoryRepo()
        self.addCleanup(r.close)
        [c1] = build_commit_graph(r.object_store, [[1]])
        # Create a tag pointing to a commit
        tag1 = Tag()
        tag1.name = b"v1.0"
        tag1.message = b"Test tag"
        tag1.tag_time = 1234567890
        tag1.tag_timezone = 0
        tag1.object = (Commit, c1.id)
        tag1.tagger = b"Test Tagger <test@example.com>"
        r.object_store.add_object(tag1)

        # Create another tag pointing to the first tag
        tag2 = Tag()
        tag2.name = b"v1.0-release"
        tag2.message = b"Release tag"
        tag2.tag_time = 1234567900
        tag2.tag_timezone = 0
        tag2.object = (Tag, tag1.id)
        tag2.tagger = b"Test Tagger <test@example.com>"
        r.object_store.add_object(tag2)

        # ^{} should recursively dereference to the commit
        self.assertEqual(c1, parse_object(r, tag2.id + b"^{}"))

    def test_path_in_tree(self) -> None:
        r = MemoryRepo()
        self.addCleanup(r.close)
        # Create a blob
        b = Blob.from_string(b"Test content")

        # Create a commit with the blob in its tree
        [c1] = build_commit_graph(r.object_store, [[1]], trees={1: [(b"test.txt", b)]})

        # HEAD:test.txt should return the blob
        r.refs[b"HEAD"] = c1.id
        result = parse_object(r, b"HEAD:test.txt")
        self.assertEqual(b"Test content", result.data)

    def test_path_in_tree_nested(self) -> None:
        r = MemoryRepo()
        self.addCleanup(r.close)
        # Create blobs
        b1 = Blob.from_string(b"Content 1")
        b2 = Blob.from_string(b"Content 2")

        # For nested trees, we need to create them manually
        # Create subtree
        subtree = Tree()
        subtree.add(b"file.txt", 0o100644, b1.id)
        r.object_store.add_object(b1)
        r.object_store.add_object(subtree)

        # Create main tree
        main_tree = Tree()
        main_tree.add(b"README", 0o100644, b2.id)
        main_tree.add(b"subdir", 0o040000, subtree.id)
        r.object_store.add_object(b2)
        r.object_store.add_object(main_tree)

        # Create commit with our tree
        c = Commit()
        c.tree = main_tree.id
        c.author = c.committer = b"Test User <test@example.com>"
        c.author_time = c.commit_time = 1234567890
        c.author_timezone = c.commit_timezone = 0
        c.message = b"Test commit"
        r.object_store.add_object(c)

        # Lookup nested path
        result = parse_object(r, c.id + b":subdir/file.txt")
        self.assertEqual(b"Content 1", result.data)

    def test_reflog_lookup(self) -> None:
        # Use a real repo for reflog testing
        import tempfile

        from dulwich.repo import Repo

        with tempfile.TemporaryDirectory() as tmpdir:
            r = Repo.init_bare(tmpdir)
            c1, c2, c3 = build_commit_graph(r.object_store, [[1], [2, 1], [3, 2]])

            # Write reflog entries using the repo's _write_reflog method
            # These are written in chronological order (oldest first)
            r._write_reflog(
                b"HEAD",
                None,
                c1.id,
                b"Test User <test@example.com>",
                1234567890,
                0,
                b"commit: Initial commit",
            )
            r._write_reflog(
                b"HEAD",
                c1.id,
                c2.id,
                b"Test User <test@example.com>",
                1234567891,
                0,
                b"commit: Second commit",
            )
            r._write_reflog(
                b"HEAD",
                c2.id,
                c3.id,
                b"Test User <test@example.com>",
                1234567892,
                0,
                b"commit: Third commit",
            )

            # HEAD@{0} is the most recent (c3)
            self.assertEqual(c3, parse_object(r, b"HEAD@{0}"))
            # HEAD@{1} is the second most recent (c2)
            self.assertEqual(c2, parse_object(r, b"HEAD@{1}"))
            # HEAD@{2} is the third/oldest (c1)
            self.assertEqual(c1, parse_object(r, b"HEAD@{2}"))

    def test_reflog_time_lookup(self) -> None:
        # Use a real repo for reflog testing with time specifications
        import tempfile

        from dulwich.repo import Repo

        with tempfile.TemporaryDirectory() as tmpdir:
            r = Repo.init_bare(tmpdir)
            c1, c2, c3 = build_commit_graph(r.object_store, [[1], [2, 1], [3, 2]])

            # Write reflog entries with specific timestamps
            # 1234567890 = 2009-02-13 23:31:30 UTC
            r._write_reflog(
                b"HEAD",
                None,
                c1.id,
                b"Test User <test@example.com>",
                1234567890,
                0,
                b"commit: Initial commit",
            )
            # 1234657890 = 2009-02-14 23:31:30 UTC (1 day + 1 second later)
            r._write_reflog(
                b"HEAD",
                c1.id,
                c2.id,
                b"Test User <test@example.com>",
                1234657890,
                0,
                b"commit: Second commit",
            )
            # 1235000000 = 2009-02-18 19:33:20 UTC
            r._write_reflog(
                b"HEAD",
                c2.id,
                c3.id,
                b"Test User <test@example.com>",
                1235000000,
                0,
                b"commit: Third commit",
            )

            # Lookup by timestamp - should get the most recent entry at or before time
            self.assertEqual(c1, parse_object(r, b"HEAD@{1234567890}"))
            self.assertEqual(c2, parse_object(r, b"HEAD@{1234657890}"))
            self.assertEqual(c3, parse_object(r, b"HEAD@{1235000000}"))
            # Future timestamp should get latest entry
            self.assertEqual(c3, parse_object(r, b"HEAD@{9999999999}"))

    def test_index_path_lookup_stage0(self) -> None:
        # Test index path lookup for stage 0 (normal files)
        import tempfile

        from dulwich.repo import Repo

        with tempfile.TemporaryDirectory() as tmpdir:
            r = Repo.init(tmpdir)

            # Create a blob and add it to the index
            b = Blob.from_string(b"Test content")
            r.object_store.add_object(b)

            # Add to index
            index = r.open_index()
            from dulwich.index import IndexEntry

            index[b"test.txt"] = IndexEntry(
                ctime=(0, 0),
                mtime=(0, 0),
                dev=0,
                ino=0,
                mode=0o100644,
                uid=0,
                gid=0,
                size=len(b.data),
                sha=b.id,
            )
            index.write()

            # Test :path syntax (defaults to stage 0)
            result = parse_object(r, b":test.txt")
            self.assertEqual(b"Test content", result.data)

            # Test :0:path syntax (explicit stage 0)
            result = parse_object(r, b":0:test.txt")
            self.assertEqual(b"Test content", result.data)

    def test_index_path_lookup_conflicts(self) -> None:
        # Test index path lookup with merge conflicts (stages 1-3)
        import tempfile

        from dulwich.index import ConflictedIndexEntry, IndexEntry
        from dulwich.repo import Repo

        with tempfile.TemporaryDirectory() as tmpdir:
            r = Repo.init(tmpdir)

            # Create three different versions of a file
            b_ancestor = Blob.from_string(b"Ancestor content")
            b_this = Blob.from_string(b"This content")
            b_other = Blob.from_string(b"Other content")
            r.object_store.add_object(b_ancestor)
            r.object_store.add_object(b_this)
            r.object_store.add_object(b_other)

            # Add conflicted entry to index
            index = r.open_index()
            index[b"conflict.txt"] = ConflictedIndexEntry(
                ancestor=IndexEntry(
                    ctime=(0, 0),
                    mtime=(0, 0),
                    dev=0,
                    ino=0,
                    mode=0o100644,
                    uid=0,
                    gid=0,
                    size=len(b_ancestor.data),
                    sha=b_ancestor.id,
                ),
                this=IndexEntry(
                    ctime=(0, 0),
                    mtime=(0, 0),
                    dev=0,
                    ino=0,
                    mode=0o100644,
                    uid=0,
                    gid=0,
                    size=len(b_this.data),
                    sha=b_this.id,
                ),
                other=IndexEntry(
                    ctime=(0, 0),
                    mtime=(0, 0),
                    dev=0,
                    ino=0,
                    mode=0o100644,
                    uid=0,
                    gid=0,
                    size=len(b_other.data),
                    sha=b_other.id,
                ),
            )
            index.write()

            # Test stage 1 (ancestor)
            result = parse_object(r, b":1:conflict.txt")
            self.assertEqual(b"Ancestor content", result.data)

            # Test stage 2 (this)
            result = parse_object(r, b":2:conflict.txt")
            self.assertEqual(b"This content", result.data)

            # Test stage 3 (other)
            result = parse_object(r, b":3:conflict.txt")
            self.assertEqual(b"Other content", result.data)

            # Test that :conflict.txt raises an error for conflicted files
            self.assertRaises(ValueError, parse_object, r, b":conflict.txt")

    def test_index_path_not_found(self) -> None:
        # Test error when path not in index
        import tempfile

        from dulwich.repo import Repo

        with tempfile.TemporaryDirectory() as tmpdir:
            r = Repo.init(tmpdir)

            # Try to lookup non-existent path
            self.assertRaises(KeyError, parse_object, r, b":nonexistent.txt")


class ParseCommitRangeTests(TestCase):
    """Test parse_commit_range."""

    def test_nonexistent(self) -> None:
        r = MemoryRepo()
        self.addCleanup(r.close)
        self.assertRaises(KeyError, parse_commit_range, r, "thisdoesnotexist..HEAD")

    def test_commit_by_sha(self) -> None:
        r = MemoryRepo()
        self.addCleanup(r.close)
        c1, _c2, _c3 = build_commit_graph(r.object_store, [[1], [2, 1], [3, 1, 2]])
        self.assertIsNone(parse_commit_range(r, c1.id))

    def test_commit_range(self) -> None:
        r = MemoryRepo()
        self.addCleanup(r.close)
        c1, c2, _c3 = build_commit_graph(r.object_store, [[1], [2, 1], [3, 1, 2]])
        result = parse_commit_range(r, f"{c1.id.decode()}..{c2.id.decode()}")
        self.assertIsNotNone(result)
        start_commit, end_commit = result
        self.assertEqual(c1, start_commit)
        self.assertEqual(c2, end_commit)


class ParseCommitTests(TestCase):
    """Test parse_commit."""

    def test_nonexistent(self) -> None:
        r = MemoryRepo()
        self.addCleanup(r.close)
        self.assertRaises(KeyError, parse_commit, r, "thisdoesnotexist")

    def test_commit_by_sha(self) -> None:
        r = MemoryRepo()
        self.addCleanup(r.close)
        [c1] = build_commit_graph(r.object_store, [[1]])
        self.assertEqual(c1, parse_commit(r, c1.id))

    def test_commit_by_short_sha(self) -> None:
        r = MemoryRepo()
        self.addCleanup(r.close)
        [c1] = build_commit_graph(r.object_store, [[1]])
        self.assertEqual(c1, parse_commit(r, c1.id[:10]))

    def test_annotated_tag(self) -> None:
        r = MemoryRepo()
        self.addCleanup(r.close)
        [c1] = build_commit_graph(r.object_store, [[1]])
        # Create an annotated tag pointing to the commit
        tag = Tag()
        tag.name = b"v1.0"
        tag.message = b"Test tag"
        tag.tag_time = 1234567890
        tag.tag_timezone = 0
        tag.object = (Commit, c1.id)
        tag.tagger = b"Test Tagger <test@example.com>"
        r.object_store.add_object(tag)
        # parse_commit should follow the tag to the commit
        self.assertEqual(c1, parse_commit(r, tag.id))

    def test_nested_tags(self) -> None:
        r = MemoryRepo()
        self.addCleanup(r.close)
        [c1] = build_commit_graph(r.object_store, [[1]])
        # Create an annotated tag pointing to the commit
        tag1 = Tag()
        tag1.name = b"v1.0"
        tag1.message = b"Test tag"
        tag1.tag_time = 1234567890
        tag1.tag_timezone = 0
        tag1.object = (Commit, c1.id)
        tag1.tagger = b"Test Tagger <test@example.com>"
        r.object_store.add_object(tag1)

        # Create another tag pointing to the first tag
        tag2 = Tag()
        tag2.name = b"v1.0-release"
        tag2.message = b"Release tag"
        tag2.tag_time = 1234567900
        tag2.tag_timezone = 0
        tag2.object = (Tag, tag1.id)
        tag2.tagger = b"Test Tagger <test@example.com>"
        r.object_store.add_object(tag2)

        # parse_commit should follow both tags to the commit
        self.assertEqual(c1, parse_commit(r, tag2.id))

    def test_tag_to_missing_commit(self) -> None:
        r = MemoryRepo()
        # Create a tag pointing to a non-existent commit
        missing_sha = b"1234567890123456789012345678901234567890"
        tag = Tag()
        tag.name = b"v1.0"
        tag.message = b"Test tag"
        tag.tag_time = 1234567890
        tag.tag_timezone = 0
        tag.object = (Commit, missing_sha)
        tag.tagger = b"Test Tagger <test@example.com>"
        r.object_store.add_object(tag)

        # Should raise KeyError for missing commit
        self.assertRaises(KeyError, parse_commit, r, tag.id)

    def test_tag_to_blob(self) -> None:
        r = MemoryRepo()
        self.addCleanup(r.close)
        # Create a blob
        blob = Blob.from_string(b"Test content")
        r.object_store.add_object(blob)

        # Create a tag pointing to the blob
        tag = Tag()
        tag.name = b"blob-tag"
        tag.message = b"Tag pointing to blob"
        tag.tag_time = 1234567890
        tag.tag_timezone = 0
        tag.object = (Blob, blob.id)
        tag.tagger = b"Test Tagger <test@example.com>"
        r.object_store.add_object(tag)

        # Should raise ValueError as it's not a commit
        self.assertRaises(ValueError, parse_commit, r, tag.id)

    def test_commit_object(self) -> None:
        r = MemoryRepo()
        self.addCleanup(r.close)
        [c1] = build_commit_graph(r.object_store, [[1]])
        # Test that passing a Commit object directly returns the same object
        self.assertEqual(c1, parse_commit(r, c1))


class ParseRefTests(TestCase):
    def test_nonexistent(self) -> None:
        r = {}
        self.assertRaises(KeyError, parse_ref, r, b"thisdoesnotexist")

    def test_ambiguous_ref(self) -> None:
        r = {
            b"ambig1": "bla",
            b"refs/ambig1": "bla",
            b"refs/tags/ambig1": "bla",
            b"refs/heads/ambig1": "bla",
            b"refs/remotes/ambig1": "bla",
            b"refs/remotes/ambig1/HEAD": "bla",
        }
        self.assertEqual(b"ambig1", parse_ref(r, b"ambig1"))

    def test_ambiguous_ref2(self) -> None:
        r = {
            b"refs/ambig2": "bla",
            b"refs/tags/ambig2": "bla",
            b"refs/heads/ambig2": "bla",
            b"refs/remotes/ambig2": "bla",
            b"refs/remotes/ambig2/HEAD": "bla",
        }
        self.assertEqual(b"refs/ambig2", parse_ref(r, b"ambig2"))

    def test_ambiguous_tag(self) -> None:
        r = {
            b"refs/tags/ambig3": "bla",
            b"refs/heads/ambig3": "bla",
            b"refs/remotes/ambig3": "bla",
            b"refs/remotes/ambig3/HEAD": "bla",
        }
        self.assertEqual(b"refs/tags/ambig3", parse_ref(r, b"ambig3"))

    def test_ambiguous_head(self) -> None:
        r = {
            b"refs/heads/ambig4": "bla",
            b"refs/remotes/ambig4": "bla",
            b"refs/remotes/ambig4/HEAD": "bla",
        }
        self.assertEqual(b"refs/heads/ambig4", parse_ref(r, b"ambig4"))

    def test_ambiguous_remote(self) -> None:
        r = {b"refs/remotes/ambig5": "bla", b"refs/remotes/ambig5/HEAD": "bla"}
        self.assertEqual(b"refs/remotes/ambig5", parse_ref(r, b"ambig5"))

    def test_ambiguous_remote_head(self) -> None:
        r = {b"refs/remotes/ambig6/HEAD": "bla"}
        self.assertEqual(b"refs/remotes/ambig6/HEAD", parse_ref(r, b"ambig6"))

    def test_heads_full(self) -> None:
        r = {b"refs/heads/foo": "bla"}
        self.assertEqual(b"refs/heads/foo", parse_ref(r, b"refs/heads/foo"))

    def test_heads_partial(self) -> None:
        r = {b"refs/heads/foo": "bla"}
        self.assertEqual(b"refs/heads/foo", parse_ref(r, b"heads/foo"))

    def test_tags_partial(self) -> None:
        r = {b"refs/tags/foo": "bla"}
        self.assertEqual(b"refs/tags/foo", parse_ref(r, b"tags/foo"))


class ParseRefsTests(TestCase):
    def test_nonexistent(self) -> None:
        r = {}
        self.assertRaises(KeyError, parse_refs, r, [b"thisdoesnotexist"])

    def test_head(self) -> None:
        r = {b"refs/heads/foo": "bla"}
        self.assertEqual([b"refs/heads/foo"], parse_refs(r, [b"foo"]))

    def test_full(self) -> None:
        r = {b"refs/heads/foo": "bla"}
        self.assertEqual([b"refs/heads/foo"], parse_refs(r, b"refs/heads/foo"))


class ParseReftupleTests(TestCase):
    def test_nonexistent(self) -> None:
        r = {}
        self.assertRaises(KeyError, parse_reftuple, r, r, b"thisdoesnotexist")

    def test_head(self) -> None:
        r = {b"refs/heads/foo": "bla"}
        self.assertEqual(
            (b"refs/heads/foo", b"refs/heads/foo", False),
            parse_reftuple(r, r, b"foo"),
        )
        self.assertEqual(
            (b"refs/heads/foo", b"refs/heads/foo", True),
            parse_reftuple(r, r, b"+foo"),
        )
        self.assertEqual(
            (b"refs/heads/foo", b"refs/heads/foo", True),
            parse_reftuple(r, {}, b"+foo"),
        )
        self.assertEqual(
            (b"refs/heads/foo", b"refs/heads/foo", True),
            parse_reftuple(r, {}, b"foo", True),
        )

    def test_full(self) -> None:
        r = {b"refs/heads/foo": "bla"}
        self.assertEqual(
            (b"refs/heads/foo", b"refs/heads/foo", False),
            parse_reftuple(r, r, b"refs/heads/foo"),
        )

    def test_no_left_ref(self) -> None:
        r = {b"refs/heads/foo": "bla"}
        self.assertEqual(
            (None, b"refs/heads/foo", False),
            parse_reftuple(r, r, b":refs/heads/foo"),
        )

    def test_no_right_ref(self) -> None:
        r = {b"refs/heads/foo": "bla"}
        self.assertEqual(
            (b"refs/heads/foo", None, False),
            parse_reftuple(r, r, b"refs/heads/foo:"),
        )

    def test_default_with_string(self) -> None:
        r = {b"refs/heads/foo": "bla"}
        self.assertEqual(
            (b"refs/heads/foo", b"refs/heads/foo", False),
            parse_reftuple(r, r, "foo"),
        )


class ParseReftuplesTests(TestCase):
    def test_nonexistent(self) -> None:
        r = {}
        self.assertRaises(KeyError, parse_reftuples, r, r, [b"thisdoesnotexist"])

    def test_head(self) -> None:
        r = {b"refs/heads/foo": "bla"}
        self.assertEqual(
            [(b"refs/heads/foo", b"refs/heads/foo", False)],
            parse_reftuples(r, r, [b"foo"]),
        )

    def test_full(self) -> None:
        r = {b"refs/heads/foo": "bla"}
        self.assertEqual(
            [(b"refs/heads/foo", b"refs/heads/foo", False)],
            parse_reftuples(r, r, b"refs/heads/foo"),
        )
        r = {b"refs/heads/foo": "bla"}
        self.assertEqual(
            [(b"refs/heads/foo", b"refs/heads/foo", True)],
            parse_reftuples(r, r, b"refs/heads/foo", True),
        )


class ParseTreeTests(TestCase):
    """Test parse_tree."""

    def test_nonexistent(self) -> None:
        r = MemoryRepo()
        self.addCleanup(r.close)
        self.assertRaises(KeyError, parse_tree, r, "thisdoesnotexist")

    def test_from_commit(self) -> None:
        r = MemoryRepo()
        self.addCleanup(r.close)
        c1, _c2, _c3 = build_commit_graph(r.object_store, [[1], [2, 1], [3, 1, 2]])
        self.assertEqual(r[c1.tree], parse_tree(r, c1.id))
        self.assertEqual(r[c1.tree], parse_tree(r, c1.tree))

    def test_from_ref(self) -> None:
        r = MemoryRepo()
        self.addCleanup(r.close)
        c1, _c2, _c3 = build_commit_graph(r.object_store, [[1], [2, 1], [3, 1, 2]])
        r.refs[b"refs/heads/foo"] = c1.id
        self.assertEqual(r[c1.tree], parse_tree(r, b"foo"))

    def test_tree_object(self) -> None:
        r = MemoryRepo()
        self.addCleanup(r.close)
        [c1] = build_commit_graph(r.object_store, [[1]])
        tree = r[c1.tree]
        # Test that passing a Tree object directly returns the same object
        self.assertEqual(tree, parse_tree(r, tree))

    def test_commit_object(self) -> None:
        r = MemoryRepo()
        self.addCleanup(r.close)
        [c1] = build_commit_graph(r.object_store, [[1]])
        # Test that passing a Commit object returns its tree
        self.assertEqual(r[c1.tree], parse_tree(r, c1))

    def test_tag_object(self) -> None:
        r = MemoryRepo()
        self.addCleanup(r.close)
        [c1] = build_commit_graph(r.object_store, [[1]])
        # Create an annotated tag pointing to the commit
        tag = Tag()
        tag.name = b"v1.0"
        tag.message = b"Test tag"
        tag.tag_time = 1234567890
        tag.tag_timezone = 0
        tag.object = (Commit, c1.id)
        tag.tagger = b"Test Tagger <test@example.com>"
        r.object_store.add_object(tag)
        # parse_tree should follow the tag to the commit's tree
        self.assertEqual(r[c1.tree], parse_tree(r, tag))