@@ -3,7 +3,6 @@
 import os
 from typing import Sequence
 
-import pre_commit.constants as C
 from pre_commit.languages.all import Language
 from pre_commit.prefix import Prefix
 
@@ -14,11 +13,12 @@ def run_language(
         exe: str,
         args: Sequence[str] = (),
         file_args: Sequence[str] = (),
-        version: str = C.DEFAULT,
+        version: str | None = None,
         deps: Sequence[str] = (),
         is_local: bool = False,
 ) -> tuple[int, bytes]:
     prefix = Prefix(str(path))
+    version = version or language.get_default_version()
 
     language.install_environment(prefix, version, deps)
     with language.in_env(prefix, version):
 
@@ -1,15 +1,14 @@
 from __future__ import annotations
 
-from typing import Mapping
 from unittest import mock
 
 import pytest
 
 import pre_commit.constants as C
 from pre_commit import parse_shebang
 from pre_commit.languages import rust
-from pre_commit.prefix import Prefix
-from pre_commit.util import cmd_output
+from pre_commit.store import _make_local_repo
+from testing.language_helpers import run_language
 
 ACTUAL_GET_DEFAULT_VERSION = rust.get_default_version.__wrapped__
 
@@ -30,64 +29,78 @@ def test_uses_default_when_rust_is_not_available(cmd_output_b_mck):
     assert ACTUAL_GET_DEFAULT_VERSION() == C.DEFAULT
 
 
-@pytest.mark.parametrize('language_version', (C.DEFAULT, '1.56.0'))
-def test_installs_with_bootstrapped_rustup(tmpdir, language_version):
-    tmpdir.join('src', 'main.rs').ensure().write(
+def _make_hello_world(tmp_path):
+    src_dir = tmp_path.joinpath('src')
+    src_dir.mkdir()
+    src_dir.joinpath('main.rs').write_text(
         'fn main() {\n'
         '    println!("Hello, world!");\n'
         '}\n',
     )
-    tmpdir.join('Cargo.toml').ensure().write(
+    tmp_path.joinpath('Cargo.toml').write_text(
         '[package]\n'
         'name = "hello_world"\n'
         'version = "0.1.0"\n'
         'edition = "2021"\n',
     )
-    prefix = Prefix(str(tmpdir))
 
-    find_executable_exes = []
 
-    original_find_executable = parse_shebang.find_executable
+def test_installs_rust_missing_rustup(tmp_path):
+    _make_hello_world(tmp_path)
 
-    def mocked_find_executable(
-            exe: str, *, env: Mapping[str, str] | None = None,
-    ) -> str | None:
-        """
-        Return `None` the first time `find_executable` is called to ensure
-        that the bootstrapping code is executed, then just let the function
-        work as normal.
+    # pretend like `rustup` doesn't exist so it gets bootstrapped
+    calls = []
+    orig = parse_shebang.find_executable
 
-        Also log the arguments to ensure that everything works as expected.
-        """
-        find_executable_exes.append(exe)
-        if len(find_executable_exes) == 1:
+    def mck(exe, env=None):
+        calls.append(exe)
+        if len(calls) == 1:
+            assert exe == 'rustup'
             return None
-        return original_find_executable(exe, env=env)
+        return orig(exe, env=env)
 
-    with mock.patch.object(parse_shebang, 'find_executable') as find_exe_mck:
-        find_exe_mck.side_effect = mocked_find_executable
-        rust.install_environment(prefix, language_version, ())
-        assert find_executable_exes == ['rustup', 'rustup', 'cargo']
+    with mock.patch.object(parse_shebang, 'find_executable', side_effect=mck):
+        ret = run_language(tmp_path, rust, 'hello_world', version='1.56.0')
+    assert calls == ['rustup', 'rustup', 'cargo', 'hello_world']
+    assert ret == (0, b'Hello, world!\n')
 
-    with rust.in_env(prefix, language_version):
-        assert cmd_output('hello_world')[1] == 'Hello, world!\n'
 
+@pytest.mark.parametrize('version', (C.DEFAULT, '1.56.0'))
+def test_language_version_with_rustup(tmp_path, version):
+    assert parse_shebang.find_executable('rustup') is not None
 
-def test_installs_with_existing_rustup(tmpdir):
-    tmpdir.join('src', 'main.rs').ensure().write(
-        'fn main() {\n'
-        '    println!("Hello, world!");\n'
-        '}\n',
-    )
-    tmpdir.join('Cargo.toml').ensure().write(
-        '[package]\n'
-        'name = "hello_world"\n'
-        'version = "0.1.0"\n'
-        'edition = "2021"\n',
+    _make_hello_world(tmp_path)
+
+    ret = run_language(tmp_path, rust, 'hello_world', version=version)
+    assert ret == (0, b'Hello, world!\n')
+
+
+@pytest.mark.parametrize('dep', ('cli:shellharden:4.2.0', 'cli:shellharden'))
+def test_rust_cli_additional_dependencies(tmp_path, dep):
+    _make_local_repo(str(tmp_path))
+
+    t_sh = tmp_path.joinpath('t.sh')
+    t_sh.write_text('echo $hi\n')
+
+    assert rust.get_default_version() == 'system'
+    ret = run_language(
+        tmp_path,
+        rust,
+        'shellharden --transform',
+        deps=(dep,),
+        args=(str(t_sh),),
     )
-    prefix = Prefix(str(tmpdir))
+    assert ret == (0, b'echo "$hi"\n')
 
-    assert parse_shebang.find_executable('rustup') is not None
-    rust.install_environment(prefix, '1.56.0', ())
-    with rust.in_env(prefix, '1.56.0'):
-        assert cmd_output('hello_world')[1] == 'Hello, world!\n'
+
+def test_run_lib_additional_dependencies(tmp_path):
+    _make_hello_world(tmp_path)
+
+    deps = ('shellharden:4.2.0', 'git-version')
+    ret = run_language(tmp_path, rust, 'hello_world', deps=deps)
+    assert ret == (0, b'Hello, world!\n')
+
+    bin_dir = tmp_path.joinpath('rustenv-system', 'bin')
+    assert bin_dir.is_dir()
+    assert not bin_dir.joinpath('shellharden').exists()
+    assert not bin_dir.joinpath('shellharden.exe').exists()
@@ -20,7 +20,6 @@
 from pre_commit.languages import node
 from pre_commit.languages import python
 from pre_commit.languages import ruby
-from pre_commit.languages import rust
 from pre_commit.languages.all import languages
 from pre_commit.prefix import Prefix
 from pre_commit.repository import _hook_installed
@@ -367,54 +366,6 @@ def test_golang_with_recursive_submodule(tmpdir, tempdir_factory, store):
     assert _norm_out(out) == b'hello hello world\n'
 
 
-def test_rust_hook(tempdir_factory, store):
-    _test_hook_repo(
-        tempdir_factory, store, 'rust_hooks_repo',
-        'rust-hook', [], b'hello world\n',
-    )
-
-
-@pytest.mark.parametrize('dep', ('cli:shellharden:3.1.0', 'cli:shellharden'))
-def test_additional_rust_cli_dependencies_installed(
-        tempdir_factory, store, dep,
-):
-    path = make_repo(tempdir_factory, 'rust_hooks_repo')
-    config = make_config_from_repo(path)
-    # A small rust package with no dependencies.
-    config['hooks'][0]['additional_dependencies'] = [dep]
-    hook = _get_hook(config, store, 'rust-hook')
-    envdir = helpers.environment_dir(
-        hook.prefix,
-        rust.ENVIRONMENT_DIR,
-        'system',
-    )
-    binaries = os.listdir(os.path.join(envdir, 'bin'))
-    # normalize for windows
-    binaries = [os.path.splitext(binary)[0] for binary in binaries]
-    assert 'shellharden' in binaries
-
-
-def test_additional_rust_lib_dependencies_installed(
-        tempdir_factory, store,
-):
-    path = make_repo(tempdir_factory, 'rust_hooks_repo')
-    config = make_config_from_repo(path)
-    # A small rust package with no dependencies.
-    deps = ['shellharden:3.1.0', 'git-version']
-    config['hooks'][0]['additional_dependencies'] = deps
-    hook = _get_hook(config, store, 'rust-hook')
-    envdir = helpers.environment_dir(
-        hook.prefix,
-        rust.ENVIRONMENT_DIR,
-        'system',
-    )
-    binaries = os.listdir(os.path.join(envdir, 'bin'))
-    # normalize for windows
-    binaries = [os.path.splitext(binary)[0] for binary in binaries]
-    assert 'rust-hello-world' in binaries
-    assert 'shellharden' not in binaries
-
-
 def test_missing_executable(tempdir_factory, store):
     _test_hook_repo(
         tempdir_factory, store, 'not_found_exe',
@@ -637,23 +588,6 @@ def test_local_golang_additional_dependencies(store):
     assert _norm_out(out) == b'Hello, Go examples!\n'
 
 
-def test_local_rust_additional_dependencies(store):
-    config = {
-        'repo': 'local',
-        'hooks': [{
-            'id': 'hello',
-            'name': 'hello',
-            'entry': 'hello',
-            'language': 'rust',
-            'additional_dependencies': ['cli:hello-cli:0.2.2'],
-        }],
-    }
-    hook = _get_hook(config, store, 'hello')
-    ret, out = _hook_run(hook, (), color=False)
-    assert ret == 0
-    assert _norm_out(out) == b'Hello World!\n'
-
-
 def test_fail_hooks(store):
     config = {
         'repo': 'local',