diff --git a/tests/formatting/correct1.blp b/tests/formatting/correct1.blp
new file mode 100644
index 0000000..4646bac
--- /dev/null
+++ b/tests/formatting/correct1.blp
@@ -0,0 +1,18 @@
+using Gtk 4.0;
+
+template $MyTemplate: Label {
+  /**
+   * A list of strings.
+   */
+  StringList {
+    // comment
+    strings [
+      'Hello',
+      C_('Greeting', 'World'),
+    ]
+  }
+
+  object: Button {
+    label: 'Click me';
+  };
+}
diff --git a/tests/test_formatter.py b/tests/test_formatter.py
index ff4ed36..65e865e 100644
--- a/tests/test_formatter.py
+++ b/tests/test_formatter.py
@@ -18,7 +18,6 @@
 # SPDX-License-Identifier: LGPL-3.0-or-later
 
 
-import difflib
 import unittest
 from pathlib import Path
 
@@ -45,3 +44,4 @@ class TestFormatter(unittest.TestCase):
     def test_formatter(self):
         self.assert_format_test("in1.blp", "out.blp")
         self.assert_format_test("in2.blp", "out.blp")
+        self.assert_format_test("correct1.blp", "correct1.blp")