diff --git a/src/borg/testsuite/archiver/mount2_cmds_test.py b/src/borg/testsuite/archiver/mount2_cmds_test.py
deleted file mode 100644
index 49796f2a2..000000000
--- a/src/borg/testsuite/archiver/mount2_cmds_test.py
+++ /dev/null
@@ -1,392 +0,0 @@
-# this is testing the mount/umount commands with mfusepy implementation
-
-import errno
-import os
-import sys
-import time
-import subprocess
-from contextlib import contextmanager
-from unittest.mock import patch
-
-import pytest
-
-from ...constants import *  # NOQA
-from ...helpers import flags_noatime, flags_normal
-from .. import has_lchflags, changedir
-from .. import same_ts_ns
-from ..platform.platform_test import fakeroot_detected
-from . import (
-    RK_ENCRYPTION,
-    cmd,
-    assert_dirs_equal,
-    create_test_files,
-    generate_archiver_tests,
-    create_src_archive,
-    open_archive,
-    src_file,
-    create_regular_file,
-)
-from . import requires_hardlinks, _extract_hardlinks_setup, are_hardlinks_supported
-
-try:
-    import mfusepy
-except ImportError:
-    mfusepy = None
-
-pytest_generate_tests = lambda metafunc: generate_archiver_tests(metafunc, kinds="local,remote,binary")  # NOQA
-
-
-@contextmanager
-def fuse_mount2(archiver, mountpoint, *args, **kwargs):
-    os.makedirs(mountpoint, exist_ok=True)
-
-    # We use subprocess to run borg mount to ensure it runs in a separate process
-    # and we can control it via signals if needed.
-    # We use --foreground to keep it running.
-
-    cmd_args = ["mount", "--foreground"]
-
-    # We need to construct the command line carefully.
-    # args might contain options or paths.
-
-    # Usage: fuse_mount2(archiver, mountpoint, options...)
-    # The repo path is archiver.repository_path
-
-    # If we want to mount a specific archive: fuse_mount2(archiver, mountpoint, "-a", "archive_name", ...)
-    # The mount command uses: borg mount --repo REPO [options] MOUNTPOINT
-
-    location = archiver.repository_path
-
-    # Check if we have extra args that look like options
-    # Just pass all args to the command
-    # We put mountpoint first, then --repo location, then all other args
-    # This supports: borg mount [options] MOUNTPOINT --repo LOCATION [more options]
-
-    borg_cmd = [sys.executable, "-m", "borg"]
-    full_cmd = borg_cmd + cmd_args + [mountpoint, "--repo", location] + list(args)
-
-    # The mount command supports various options like -a/--match-archives, -o, paths, etc.
-    # All options are passed through in args.
-
-    # Command: borg mount [options] MOUNTPOINT --repo=LOCATION
-
-    borg_cmd = [sys.executable, "-m", "borg"]
-    # We pass mountpoint as positional arg, and repo as --repo
-    # options and other_args are passed as is
-    # full_cmd constructed above
-
-    env = os.environ.copy()
-    # Set BORG_FUSE_IMPL to use mfusepy implementation
-    env["BORG_FUSE_IMPL"] = "mfusepy"
-
-    # env["BORG_REPO"] = archiver.repository_location # Not needed if --repo is used, but keeps it safe?
-    # Actually, if we use --repo, we don't need BORG_REPO env var for the command,
-    # but we might need it for other things?
-    # Let's keep it but --repo should take precedence or be used.
-    env["BORG_RELOCATED_REPO_ACCESS_IS_OK"] = "yes"
-
-    # p = subprocess.Popen(full_cmd, env=env, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
-    # For debugging, let's inherit stderr
-    # p = subprocess.Popen(full_cmd, env=env, stdout=subprocess.PIPE, stderr=None)
-
-    log_file_path = os.path.join(os.getcwd(), "mount2.log")
-    log_file = open(log_file_path, "w")
-    p = subprocess.Popen(full_cmd, env=env, stdout=log_file, stderr=log_file)
-
-    # Wait for mount
-    timeout = 5
-    start = time.time()
-    while time.time() - start < timeout:
-        if os.path.ismount(mountpoint):
-            break
-        time.sleep(0.1)
-    else:
-        # Timeout or failed
-        p.terminate()
-        p.wait()
-        log_file.close()
-        with open(log_file_path, "r") as f:
-            output = f.read()
-        print("Mount failed to appear. Output:", output, file=sys.stderr)
-        # We might want to raise, but let's yield to let the test fail with a better error
-        # or maybe the test expects failure?
-
-    try:
-        yield
-    finally:
-        if not log_file.closed:
-            log_file.close()
-        if os.path.ismount(mountpoint):
-            # Try to umount
-            subprocess.call(["umount", mountpoint])
-            # If that fails (e.g. busy), we might need force or fusermount -u
-            if os.path.ismount(mountpoint):
-                subprocess.call(["fusermount", "-u", "-z", mountpoint])
-
-        p.terminate()
-        p.wait()
-        # Cleanup mountpoint dir if empty
-        try:
-            os.rmdir(mountpoint)
-        except OSError:
-            pass
-
-
-def test_mount2_missing_mfuse(archivers, request):
-    archiver = request.getfixturevalue(archivers)
-    # Ensure mfuse is NOT in sys.modules or is None
-    with patch.dict(sys.modules, {"mfusepy": None}):
-        cmd(archiver, "repo-create", RK_ENCRYPTION)
-        cmd(archiver, "create", "archive", "input")
-        mountpoint = os.path.join(archiver.tmpdir, "mountpoint")
-        os.makedirs(mountpoint, exist_ok=True)
-
-        from ...helpers import CommandError
-
-        # Set BORG_FUSE_IMPL to mfusepy, but it won't be available
-        env = os.environ.copy()
-        env["BORG_FUSE_IMPL"] = "mfusepy"
-
-        try:
-            # This should fail because mfusepy is not available
-            cmd(archiver, "mount", "--repo", archiver.repository_path, "-a", "archive", mountpoint, fork=True, env=env)
-        except CommandError:
-            # We expect it to fail because mfuse is missing
-            # The error message might vary depending on how it's handled
-            pass
-        except Exception:
-            pass
-
-
-@requires_hardlinks
-@pytest.mark.skipif(mfusepy is None, reason="mfusepy not installed")
-def test_fuse_mount_hardlinks(archivers, request):
-    archiver = request.getfixturevalue(archivers)
-    _extract_hardlinks_setup(archiver)
-    mountpoint = os.path.join(archiver.tmpdir, "mountpoint")
-    # we need to get rid of permissions checking because fakeroot causes issues with it.
-    # On all platforms, borg defaults to "default_permissions" and we need to get rid of it via "ignore_permissions".
-    # On macOS (darwin), we additionally need "defer_permissions" to switch off the checks in osxfuse.
-    if sys.platform == "darwin":
-        ignore_perms = ["-o", "ignore_permissions,defer_permissions"]
-    else:
-        ignore_perms = ["-o", "ignore_permissions"]
-    with fuse_mount2(archiver, mountpoint, "-a", "test", "--strip-components=2", *ignore_perms):
-        with changedir(os.path.join(mountpoint, "test")):
-            assert os.stat("hardlink").st_nlink == 2
-            assert os.stat("subdir/hardlink").st_nlink == 2
-            assert open("subdir/hardlink", "rb").read() == b"123456"
-            assert os.stat("aaaa").st_nlink == 2
-            assert os.stat("source2").st_nlink == 2
-
-    with fuse_mount2(archiver, mountpoint, "input/dir1", "-a", "test", *ignore_perms):
-        with changedir(os.path.join(mountpoint, "test")):
-            assert os.stat("input/dir1/hardlink").st_nlink == 2
-            assert os.stat("input/dir1/subdir/hardlink").st_nlink == 2
-            assert open("input/dir1/subdir/hardlink", "rb").read() == b"123456"
-            assert os.stat("input/dir1/aaaa").st_nlink == 2
-            assert os.stat("input/dir1/source2").st_nlink == 2
-
-    with fuse_mount2(archiver, mountpoint, "-a", "test", *ignore_perms):
-        with changedir(os.path.join(mountpoint, "test")):
-            assert os.stat("input/source").st_nlink == 4
-            assert os.stat("input/abba").st_nlink == 4
-            assert os.stat("input/dir1/hardlink").st_nlink == 4
-            assert os.stat("input/dir1/subdir/hardlink").st_nlink == 4
-            assert open("input/dir1/subdir/hardlink", "rb").read() == b"123456"
-
-
-@pytest.mark.skipif(mfusepy is None, reason="mfusepy not installed")
-def test_fuse_duplicate_name(archivers, request):
-    archiver = request.getfixturevalue(archivers)
-    cmd(archiver, "repo-create", RK_ENCRYPTION)
-    cmd(archiver, "create", "duplicate", "input")
-    cmd(archiver, "create", "duplicate", "input")
-    cmd(archiver, "create", "unique1", "input")
-    cmd(archiver, "create", "unique2", "input")
-    mountpoint = os.path.join(archiver.tmpdir, "mountpoint")
-    # mount the whole repository, archives show up as toplevel directories:
-    with fuse_mount2(archiver, mountpoint):
-        path = os.path.join(mountpoint)
-        dirs = os.listdir(path)
-        assert len(set(dirs)) == 4  # there must be 4 unique dir names for 4 archives
-        assert "unique1" in dirs  # if an archive has a unique name, do not append the archive id
-        assert "unique2" in dirs
-
-
-@pytest.mark.skipif(mfusepy is None, reason="mfusepy not installed")
-def test_fuse_allow_damaged_files(archivers, request):
-    archiver = request.getfixturevalue(archivers)
-    cmd(archiver, "repo-create", RK_ENCRYPTION)
-    create_src_archive(archiver, "archive")
-    # Get rid of a chunk
-    archive, repository = open_archive(archiver.repository_path, "archive")
-    with repository:
-        for item in archive.iter_items():
-            if item.path.endswith(src_file):
-                repository.delete(item.chunks[-1].id)
-                path = item.path  # store full path for later
-                break
-        else:
-            assert False  # missed the file
-
-    mountpoint = os.path.join(archiver.tmpdir, "mountpoint")
-    with fuse_mount2(archiver, mountpoint, "-a", "archive"):
-        with open(os.path.join(mountpoint, "archive", path), "rb") as f:
-            with pytest.raises(OSError) as excinfo:
-                f.read()
-            assert excinfo.value.errno == errno.EIO
-
-    with fuse_mount2(archiver, mountpoint, "-a", "archive", "-o", "allow_damaged_files"):
-        with open(os.path.join(mountpoint, "archive", path), "rb") as f:
-            # no exception raised, missing data will be all-zero
-            data = f.read()
-        assert data.endswith(b"\0\0")
-
-
-@pytest.mark.skipif(mfusepy is None, reason="mfusepy not installed")
-def test_fuse_versions_view(archivers, request):
-    archiver = request.getfixturevalue(archivers)
-    cmd(archiver, "repo-create", RK_ENCRYPTION)
-    create_regular_file(archiver.input_path, "test", contents=b"first")
-    if are_hardlinks_supported():
-        create_regular_file(archiver.input_path, "hardlink1", contents=b"123456")
-        os.link("input/hardlink1", "input/hardlink2")
-        os.link("input/hardlink1", "input/hardlink3")
-    cmd(archiver, "create", "archive1", "input")
-    create_regular_file(archiver.input_path, "test", contents=b"second")
-    cmd(archiver, "create", "archive2", "input")
-    mountpoint = os.path.join(archiver.tmpdir, "mountpoint")
-    # mount the whole repository, archive contents shall show up in versioned view:
-    with fuse_mount2(archiver, mountpoint, "-o", "versions"):
-        path = os.path.join(mountpoint, "input", "test")  # filename shows up as directory ...
-        files = os.listdir(path)
-        assert all(f.startswith("test.") for f in files)  # ... with files test.xxxxx in there
-        assert {b"first", b"second"} == {open(os.path.join(path, f), "rb").read() for f in files}
-        if are_hardlinks_supported():
-            hl1 = os.path.join(mountpoint, "input", "hardlink1", "hardlink1.00001")
-            hl2 = os.path.join(mountpoint, "input", "hardlink2", "hardlink2.00001")
-            hl3 = os.path.join(mountpoint, "input", "hardlink3", "hardlink3.00001")
-            # Note: In fuse2.py versions mode, hardlinks don't share inodes due to Node architecture
-            # but they do have correct nlink counts and content
-            # assert os.stat(hl1).st_ino == os.stat(hl2).st_ino == os.stat(hl3).st_ino
-            assert os.stat(hl1).st_nlink == 3
-            assert os.stat(hl2).st_nlink == 3
-            assert os.stat(hl3).st_nlink == 3
-            assert open(hl3, "rb").read() == b"123456"
-    # similar again, but exclude the 1st hard link:
-    with fuse_mount2(archiver, mountpoint, "-o", "versions", "-e", "input/hardlink1"):
-        if are_hardlinks_supported():
-            hl2 = os.path.join(mountpoint, "input", "hardlink2", "hardlink2.00001")
-            hl3 = os.path.join(mountpoint, "input", "hardlink3", "hardlink3.00001")
-            # Note: Same limitation as above
-            # assert os.stat(hl2).st_ino == os.stat(hl3).st_ino
-            assert os.stat(hl2).st_nlink == 2
-            assert os.stat(hl3).st_nlink == 2
-            assert open(hl3, "rb").read() == b"123456"
-
-
-@pytest.mark.skipif(mfusepy is None, reason="mfusepy not installed")
-def test_fuse_mount_options(archivers, request):
-    archiver = request.getfixturevalue(archivers)
-    cmd(archiver, "repo-create", RK_ENCRYPTION)
-    create_src_archive(archiver, "arch11")
-    create_src_archive(archiver, "arch12")
-    create_src_archive(archiver, "arch21")
-    create_src_archive(archiver, "arch22")
-    mountpoint = os.path.join(archiver.tmpdir, "mountpoint")
-    with fuse_mount2(archiver, mountpoint, "--first=2", "--sort-by=name"):
-        assert sorted(os.listdir(os.path.join(mountpoint))) == ["arch11", "arch12"]
-    with fuse_mount2(archiver, mountpoint, "--last=2", "--sort-by=name"):
-        assert sorted(os.listdir(os.path.join(mountpoint))) == ["arch21", "arch22"]
-    with fuse_mount2(archiver, mountpoint, "--match-archives=sh:arch1*"):
-        assert sorted(os.listdir(os.path.join(mountpoint))) == ["arch11", "arch12"]
-    with fuse_mount2(archiver, mountpoint, "--match-archives=sh:arch2*"):
-        assert sorted(os.listdir(os.path.join(mountpoint))) == ["arch21", "arch22"]
-    with fuse_mount2(archiver, mountpoint, "--match-archives=sh:arch*"):
-        assert sorted(os.listdir(os.path.join(mountpoint))) == ["arch11", "arch12", "arch21", "arch22"]
-    with fuse_mount2(archiver, mountpoint, "--match-archives=nope"):
-        assert sorted(os.listdir(os.path.join(mountpoint))) == []
-
-
-def test_fuse2(archivers, request):
-    archiver = request.getfixturevalue(archivers)
-    if archiver.EXE and fakeroot_detected():
-        pytest.skip("test_fuse with the binary is not compatible with fakeroot")
-
-    def has_noatime(some_file):
-        atime_before = os.stat(some_file).st_atime_ns
-        try:
-            os.close(os.open(some_file, flags_noatime))
-        except PermissionError:
-            return False
-        else:
-            atime_after = os.stat(some_file).st_atime_ns
-            noatime_used = flags_noatime != flags_normal
-            return noatime_used and atime_before == atime_after
-
-    cmd(archiver, "repo-create", RK_ENCRYPTION)
-    create_test_files(archiver.input_path)
-    have_noatime = has_noatime("input/file1")
-    cmd(archiver, "create", "--atime", "archive", "input")
-    cmd(archiver, "create", "--atime", "archive2", "input")
-
-    if has_lchflags:
-        os.remove(os.path.join("input", "flagfile"))
-
-    mountpoint = os.path.join(archiver.tmpdir, "mountpoint")
-
-    # Mount specific archive
-    with fuse_mount2(archiver, mountpoint, "-a", "archive"):
-        # Check if archive is listed
-        assert "archive" in os.listdir(mountpoint)
-
-        # Check contents
-        assert_dirs_equal(
-            archiver.input_path, os.path.join(mountpoint, "archive", "input"), ignore_flags=True, ignore_xattrs=True
-        )
-
-        # Check details of a file
-        in_fn = "input/file1"
-        out_fn = os.path.join(mountpoint, "archive", "input", "file1")
-
-        sti1 = os.stat(in_fn)
-        sto1 = os.stat(out_fn)
-
-        assert sti1.st_mode == sto1.st_mode
-        assert sti1.st_uid == sto1.st_uid
-        assert sti1.st_gid == sto1.st_gid
-        assert sti1.st_size == sto1.st_size
-
-        # Check timestamps (nanosecond resolution)
-        # We enabled use_ns = True, so we expect high precision if supported
-        assert same_ts_ns(sti1.st_mtime * 1e9, sto1.st_mtime * 1e9)
-        assert same_ts_ns(sti1.st_ctime * 1e9, sto1.st_ctime * 1e9)
-
-        if have_noatime:
-            assert same_ts_ns(sti1.st_atime * 1e9, sto1.st_atime * 1e9)
-
-        # Read content
-        with open(in_fn, "rb") as f1, open(out_fn, "rb") as f2:
-            assert f1.read() == f2.read()
-
-    # Mount whole repository
-    with fuse_mount2(archiver, mountpoint):
-        assert_dirs_equal(
-            archiver.input_path, os.path.join(mountpoint, "archive", "input"), ignore_flags=True, ignore_xattrs=True
-        )
-        assert_dirs_equal(
-            archiver.input_path, os.path.join(mountpoint, "archive2", "input"), ignore_flags=True, ignore_xattrs=True
-        )
-
-    # Ignore permissions
-    with fuse_mount2(archiver, mountpoint, "-o", "ignore_permissions"):
-        assert_dirs_equal(
-            archiver.input_path, os.path.join(mountpoint, "archive", "input"), ignore_flags=True, ignore_xattrs=True
-        )
-
-    # Allow damaged files
-    with fuse_mount2(archiver, mountpoint, "-o", "allow_damaged_files"):
-        assert_dirs_equal(
-            archiver.input_path, os.path.join(mountpoint, "archive", "input"), ignore_flags=True, ignore_xattrs=True
-        )
diff --git a/src/borg/testsuite/archiver/mount_cmds_test.py b/src/borg/testsuite/archiver/mount_cmds_test.py
index 6209ad708..34266a788 100644
--- a/src/borg/testsuite/archiver/mount_cmds_test.py
+++ b/src/borg/testsuite/archiver/mount_cmds_test.py
@@ -1,3 +1,9 @@
+# This file tests the mount/umount commands.
+# The FUSE implementation used depends on the BORG_FUSE_IMPL environment variable:
+# - BORG_FUSE_IMPL=pyfuse3,llfuse: Tests run with llfuse/pyfuse3 (skipped if not available)
+# - BORG_FUSE_IMPL=mfusepy: Tests run with mfusepy (skipped if not available)
+# The tox configuration (pyproject.toml) runs these tests with different BORG_FUSE_IMPL settings.
+
 import errno
 import os
 import stat
@@ -5,6 +11,11 @@ import sys
 
 import pytest
 
+try:
+    import mfusepy
+except ImportError:
+    mfusepy = None
+
 from ... import xattr, platform
 from ...constants import *  # NOQA
 from ...platform import ENOATTR
@@ -21,7 +32,7 @@ pytest_generate_tests = lambda metafunc: generate_archiver_tests(metafunc, kinds
 
 
 @requires_hardlinks
-@pytest.mark.skipif(not llfuse, reason="llfuse not installed")
+@pytest.mark.skipif(not llfuse and not mfusepy, reason="FUSE not available")
 def test_fuse_mount_hardlinks(archivers, request):
     archiver = request.getfixturevalue(archivers)
     _extract_hardlinks_setup(archiver)
@@ -59,7 +70,7 @@ def test_fuse_mount_hardlinks(archivers, request):
         assert open("input/dir1/subdir/hardlink", "rb").read() == b"123456"
 
 
-@pytest.mark.skipif(not llfuse, reason="llfuse not installed")
+@pytest.mark.skipif(not llfuse and not mfusepy, reason="FUSE not available")
 def test_fuse(archivers, request):
     archiver = request.getfixturevalue(archivers)
     if archiver.EXE and fakeroot_detected():
@@ -167,7 +178,7 @@ def test_fuse(archivers, request):
                 raise
 
 
-@pytest.mark.skipif(not llfuse, reason="llfuse not installed")
+@pytest.mark.skipif(not llfuse and not mfusepy, reason="FUSE not available")
 def test_fuse_versions_view(archivers, request):
     archiver = request.getfixturevalue(archivers)
     cmd(archiver, "repo-create", RK_ENCRYPTION)
@@ -201,7 +212,7 @@ def test_fuse_versions_view(archivers, request):
             assert open(hl3, "rb").read() == b"123456"
 
 
-@pytest.mark.skipif(not llfuse, reason="llfuse not installed")
+@pytest.mark.skipif(not llfuse and not mfusepy, reason="FUSE not available")
 def test_fuse_duplicate_name(archivers, request):
     archiver = request.getfixturevalue(archivers)
     cmd(archiver, "repo-create", RK_ENCRYPTION)
@@ -219,7 +230,7 @@ def test_fuse_duplicate_name(archivers, request):
         assert "unique2" in dirs
 
 
-@pytest.mark.skipif(not llfuse, reason="llfuse not installed")
+@pytest.mark.skipif(not llfuse and not mfusepy, reason="FUSE not available")
 def test_fuse_allow_damaged_files(archivers, request):
     archiver = request.getfixturevalue(archivers)
     cmd(archiver, "repo-create", RK_ENCRYPTION)
@@ -249,7 +260,7 @@ def test_fuse_allow_damaged_files(archivers, request):
         assert data.endswith(b"\0\0")
 
 
-@pytest.mark.skipif(not llfuse, reason="llfuse not installed")
+@pytest.mark.skipif(not llfuse and not mfusepy, reason="FUSE not available")
 def test_fuse_mount_options(archivers, request):
     archiver = request.getfixturevalue(archivers)
     cmd(archiver, "repo-create", RK_ENCRYPTION)
@@ -272,7 +283,7 @@ def test_fuse_mount_options(archivers, request):
         assert sorted(os.listdir(os.path.join(mountpoint))) == []
 
 
-@pytest.mark.skipif(not llfuse, reason="llfuse not installed")
+@pytest.mark.skipif(not llfuse and not mfusepy, reason="FUSE not available")
 def test_migrate_lock_alive(archivers, request):
     """Both old_id and new_id must not be stale during lock migration / daemonization."""
     archiver = request.getfixturevalue(archivers)