Merging upstream version 3.1.0.

Signed-off-by: Daniel Baumann <daniel@debian.org>

testing/language_helpers.py

@@ -3,7 +3,7 @@ from __future__ import annotations
 import os
 from typing import Sequence
 
-from pre_commit.languages.all import Language
+from pre_commit.lang_base import Language
 from pre_commit.prefix import Prefix
 
 
@@ -16,13 +16,16 @@ def run_language(
         version: str | None = None,
         deps: Sequence[str] = (),
         is_local: bool = False,
+        require_serial: bool = True,
+        color: bool = False,
 ) -> tuple[int, bytes]:
     prefix = Prefix(str(path))
     version = version or language.get_default_version()
 
-    language.install_environment(prefix, version, deps)
-    health_error = language.health_check(prefix, version)
-    assert health_error is None, health_error
+    if language.ENVIRONMENT_DIR is not None:
+        language.install_environment(prefix, version, deps)
+        health_error = language.health_check(prefix, version)
+        assert health_error is None, health_error
     with language.in_env(prefix, version):
         ret, out = language.run_hook(
             prefix,
@@ -30,8 +33,8 @@ def run_language(
             args,
             file_args,
             is_local=is_local,
-            require_serial=True,
-            color=False,
+            require_serial=require_serial,
+            color=color,
         )
         out = out.replace(b'\r\n', b'\n')
         return ret, out