Implement test for dirname normalised bug

test.py

@@ -1,4 +1,5 @@
 from string import punctuation, whitespace
+from os.path import dirname
 
 import pytest
 
@@ -36,8 +37,16 @@ def test_remove_accent_from_letters(normalise):
     assert normalise('éáűöüóőú') == 'eauouoou'
 
 
-def test_dirname_is_not_changed(normalise):
-    assert False
+@pytest.mark.parametrize(
+    'path', [
+        '/home/user/Desktop/cica sajt',
+        '/Users/cat/big\tcheese',
+        '/etc/nginx/sites-enabled/cat.conf'
+        '/root/what/big  celebration.txt'
+    ]
+)
+def test_dirname_is_not_changed(normalise, path):
+    assert dirname(normalise(path)) == dirname(path)
 
 
 def test_name_with_trailing_slash_is_normalised(normalise):