diff --git a/tests/__init__.py b/tests/__init__.py
index c7c7e47..70e7c21 100644
--- a/tests/__init__.py
+++ b/tests/__init__.py
@@ -1,3 +1,4 @@
+import platform
 import sys
 import zipfile
 from pathlib import Path
@@ -117,6 +118,22 @@ def uncommon_text() -> str:
     return "\033[31;1;4m BaD TeΧt \u200d ❌ \033[0m"
 
 
+@pytest.fixture
+def uncommon_filename(uncommon_text: str) -> str:
+    """Craft a filename with Unicode characters that are considered not common.
+
+    We reuse the same uncommon string as above, with a small exception for macOS.
+    Because the APFS filesystem in macOS accepts only UTF-8 encoded strings [1], we
+    cannot create a filename with invalid Unicode characters. So, in order to test the
+    rest of the corner cases, we replace U+DCF0 with an empty string.
+
+    [1]: https://en.wikipedia.org/wiki/Filename#Comparison_of_filename_limitations
+    """
+    if platform.system() == "Darwin":
+        uncommon_text = uncommon_text.replace("\udcf0", "")
+    return uncommon_text + ".pdf"
+
+
 @pytest.fixture
 def sanitized_text() -> str:
     """Return a sanitized version of the uncommon_text."""