Test if icons from css urls is a subset of filenames in icon dir

src/moin/macros/_tests/test_ShowIcons.py

@@ -5,8 +5,12 @@
 Test for macros.ShowIcons
 """
 
+import re
+import os
 from moin.macros.ShowIcons import Macro
 
+my_dir = os.path.abspath(os.path.dirname(__file__))
+
 
 def test_ShowIconsMacro():
     """Call ShowIcons macro and test output"""
@@ -30,3 +34,35 @@ def test_ShowIconsMacro():
     assert expected_tags.issubset(result_tags)
     assert expected_texts.issubset(result_texts)
     assert expected_paths.issubset(result_paths)
+
+
+def get_css_icon_names():
+    """Read css file and search for icon urls"""
+    css_file = os.path.join(os.path.split(my_dir)[0], "..", "static", "css", "common.css")
+    with open(css_file, encoding="utf-8") as f:
+        common_css = f.readlines()
+    icon_list = set()
+    for line in common_css:
+        link = re.search(r"url\([\'\"]?([(.)/].*?)[\'\"]?\)", line)
+        if link and link.group(0)[5:].startswith("../img/icons"):
+            icon_list.add(link.group(0).split("/", 3)[3][:-2])
+    return icon_list
+
+
+def get_icon_filenames():
+    """Scan img/icons dir for filenames"""
+    icon_dir = os.path.join(os.path.split(my_dir)[0], "..", "static", "img", "icons")
+    filenames = set()
+    with os.scandir(icon_dir) as files:
+        for file in files:
+            if not file.name.startswith(".") and file.is_file():
+                filenames.add(file.name)
+    return filenames
+
+
+def test_all_icon_files_exist():
+    """Test if icons from css urls is a subset of filenames in icon dir"""
+    icons = get_css_icon_names()
+    files = get_icon_filenames()
+    missing_icons = list(icons - files)
+    assert not missing_icons