Optimized filter functions

tests/integration/test_no_applications_variable_usage.py

@@ -0,0 +1,47 @@
+# tests/integration/test_no_applications_variable_usage.py
+
+import os
+import re
+import unittest
+
+class TestNoApplicationsVariableUsage(unittest.TestCase):
+    """
+    This test ensures that the pattern `applications[some_variable]` is not used anywhere
+    under the roles/ directory. Instead, the usage of get_app_conf should be preferred.
+    """
+
+    APPLICATIONS_VARIABLE_PATTERN = re.compile(r"applications\[\s*[a-zA-Z_][a-zA-Z0-9_]*\s*\]")
+
+    def test_no_applications_variable_usage(self):
+        roles_dir = os.path.abspath(os.path.join(os.path.dirname(__file__), '..', '..', 'roles'))
+        found = []
+
+        for root, dirs, files in os.walk(roles_dir):
+            # Skip __pycache__ folders
+            dirs[:] = [d for d in dirs if d != '__pycache__']
+            for file in files:
+                if file.endswith('.pyc'):
+                    continue
+                file_path = os.path.join(root, file)
+                # Skip this test file itself (so it can contain the pattern in docstrings)
+                if os.path.abspath(file_path) == os.path.abspath(__file__):
+                    continue
+                try:
+                    with open(file_path, 'r', encoding='utf-8') as f:
+                        for lineno, line in enumerate(f, 1):
+                            match = self.APPLICATIONS_VARIABLE_PATTERN.search(line)
+                            if match:
+                                found.append(f"{file_path}:{lineno}: {line.strip()}")
+                except Exception:
+                    # Binary or unreadable file, skip
+                    continue
+
+        if found:
+            self.fail(
+                "Found illegal usages of 'applications[variable]' in the following locations:\n"
+                + "\n".join(found)
+                + "\n\nPlease use get_app_conf instead."
+            )
+
+if __name__ == '__main__':
+    unittest.main()