X-Git-Url: https://git.madduck.net/etc/vim.git/blobdiff_plain/1e557184b0a9f43bfbff862669966bc5328517e9..e7b967132fdbb9e2e4c4e9916530d238848ab183:/tests/test_black.py

diff --git a/tests/test_black.py b/tests/test_black.py
index 02a707e..81e7a9a 100644
--- a/tests/test_black.py
+++ b/tests/test_black.py
@@ -6,6 +6,7 @@ import io
 import logging
 import multiprocessing
 import os
+import re
 import sys
 import types
 import unittest
@@ -31,7 +32,6 @@ from unittest.mock import MagicMock, patch
 
 import click
 import pytest
-import re
 from click import unstyle
 from click.testing import CliRunner
 from pathspec import PathSpec
@@ -59,8 +59,8 @@ from tests.util import (
     dump_to_stderr,
     ff,
     fs,
-    read_data,
     get_case_path,
+    read_data,
     read_data_from_file,
 )
 
@@ -310,6 +310,26 @@ class BlackTestCase(BlackBaseTestCase):
         versions = black.detect_target_versions(root)
         self.assertIn(black.TargetVersion.PY38, versions)
 
+    def test_detect_debug_f_strings(self) -> None:
+        root = black.lib2to3_parse("""f"{x=}" """)
+        features = black.get_features_used(root)
+        self.assertIn(black.Feature.DEBUG_F_STRINGS, features)
+        versions = black.detect_target_versions(root)
+        self.assertIn(black.TargetVersion.PY38, versions)
+
+        root = black.lib2to3_parse(
+            """f"{x}"\nf'{"="}'\nf'{(x:=5)}'\nf'{f(a="3=")}'\nf'{x:=10}'\n"""
+        )
+        features = black.get_features_used(root)
+        self.assertNotIn(black.Feature.DEBUG_F_STRINGS, features)
+
+        # We don't yet support feature version detection in nested f-strings
+        root = black.lib2to3_parse(
+            """f"heard a rumour that { f'{1+1=}' } ... seems like it could be true" """
+        )
+        features = black.get_features_used(root)
+        self.assertNotIn(black.Feature.DEBUG_F_STRINGS, features)
+
     @patch("black.dump_to_file", dump_to_stderr)
     def test_string_quotes(self) -> None:
         source, expected = read_data("miscellaneous", "string_quotes")
@@ -1461,7 +1481,6 @@ class BlackTestCase(BlackBaseTestCase):
         black.assert_stable(source, output, mode=DEFAULT_MODE)
 
     def test_bpo_2142_workaround(self) -> None:
-
         # https://bugs.python.org/issue2142
 
         source, _ = read_data("miscellaneous", "missing_final_newline")