X-Git-Url: https://git.madduck.net/etc/vim.git/blobdiff_plain/d0e06b53b09248be34c1d5c0fa8f050bff1d201c..72de89f54e744a8b3bbc9d3ea71f78a67d8ba82e:/tests/util.py

diff --git a/tests/util.py b/tests/util.py
index 3670952..e83017f 100644
--- a/tests/util.py
+++ b/tests/util.py
@@ -1,10 +1,14 @@
 import os
 import unittest
 from pathlib import Path
-from typing import List, Tuple, Any
-import black
+from typing import Iterator, List, Tuple, Any
+from contextlib import contextmanager
 from functools import partial
 
+import black
+from black.output import out, err
+from black.debug import DebugVisitor
+
 THIS_DIR = Path(__file__).parent
 PROJECT_ROOT = THIS_DIR.parent
 EMPTY_LINE = "# EMPTY LINE WITH WHITESPACE" + " (this comment will be removed)"
@@ -26,21 +30,21 @@ class BlackBaseTestCase(unittest.TestCase):
 
     def assertFormatEqual(self, expected: str, actual: str) -> None:
         if actual != expected and not os.environ.get("SKIP_AST_PRINT"):
-            bdv: black.DebugVisitor[Any]
-            black.out("Expected tree:", fg="green")
+            bdv: DebugVisitor[Any]
+            out("Expected tree:", fg="green")
             try:
                 exp_node = black.lib2to3_parse(expected)
-                bdv = black.DebugVisitor()
+                bdv = DebugVisitor()
                 list(bdv.visit(exp_node))
             except Exception as ve:
-                black.err(str(ve))
-            black.out("Actual tree:", fg="red")
+                err(str(ve))
+            out("Actual tree:", fg="red")
             try:
                 exp_node = black.lib2to3_parse(actual)
-                bdv = black.DebugVisitor()
+                bdv = DebugVisitor()
                 list(bdv.visit(exp_node))
             except Exception as ve:
-                black.err(str(ve))
+                err(str(ve))
         self.assertMultiLineEqual(expected, actual)
 
 
@@ -69,3 +73,14 @@ def read_data_from_file(file_name: Path) -> Tuple[str, str]:
         # If there's no output marker, treat the entire file as already pre-formatted.
         _output = _input[:]
     return "".join(_input).strip() + "\n", "".join(_output).strip() + "\n"
+
+
+@contextmanager
+def change_directory(path: Path) -> Iterator[None]:
+    """Context manager to temporarily chdir to a different directory."""
+    previous_dir = os.getcwd()
+    try:
+        os.chdir(path)
+        yield
+    finally:
+        os.chdir(previous_dir)