test: add RED test for config schema advanced flags (TDD checkpoint)

Adds test_config_schema.py verifying every visible field has an
explicit 'advanced' bool, basic fields are advanced=False, and
sampled advanced fields are advanced=True.

backend/tests/adapters/arma3/test_config_schema.py

@@ -0,0 +1,89 @@
+"""Tests for Arma3ConfigGenerator.get_ui_schema() — advanced flag completeness."""
+import pytest
+from adapters.arma3.config_generator import Arma3ConfigGenerator
+
+BASIC_FIELDS = {
+    "server": {
+        "hostname", "max_players", "password", "password_admin",
+        "motd_lines", "motd_interval",
+        "forced_difficulty", "auto_select_mission", "random_mission_order",
+        "persistent", "skip_lobby", "drawing_in_map",
+        "battleye", "verify_signatures", "allowed_file_patching",
+        "disable_von", "von_codec",
+    },
+    "profile": {
+        "group_indicators", "friendly_tags", "enemy_tags",
+        "commands", "waypoints", "weapon_info", "stance_indicator",
+        "ai_level_preset", "skill_ai", "precision_ai",
+    },
+    "rcon": {"rcon_password", "enabled"},
+}
+
+ADVANCED_SAMPLES = {
+    "server": {
+        "server_command_password", "kick_duplicate", "vote_threshold",
+        "max_ping", "max_packet_loss", "disconnect_timeout",
+        "kick_on_ping", "log_file", "upnp", "loopback",
+        "admin_uids", "headless_clients", "local_clients",
+        "default_mission_params",
+    },
+    "basic": {
+        "min_bandwidth", "max_bandwidth", "max_msg_send",
+        "max_size_guaranteed", "min_error_to_send",
+    },
+    "profile": {
+        "reduced_damage", "tactical_ping", "weapon_crosshair",
+        "vision_aid", "third_person_view", "score_table",
+        "death_messages", "von_id",
+    },
+    "launch": {
+        "world", "limit_fps", "cpu_count", "max_mem",
+        "enable_ht", "huge_pages", "no_logs", "netlog",
+    },
+    "rcon": {"max_ping"},
+}
+
+
+@pytest.fixture
+def schema():
+    return Arma3ConfigGenerator().get_ui_schema()
+
+
+def test_every_visible_field_has_advanced_key(schema):
+    """Every non-hidden field must carry an explicit `advanced` bool."""
+    for section, fields in schema.items():
+        for field, entry in fields.items():
+            if entry.get("widget") == "hidden":
+                continue
+            assert "advanced" in entry, (
+                f"section={section!r} field={field!r} is missing 'advanced' key"
+            )
+
+
+def test_basic_fields_are_not_advanced(schema):
+    """Confirmed basic fields must have advanced=False."""
+    for section, field_names in BASIC_FIELDS.items():
+        for field in field_names:
+            entry = schema[section][field]
+            assert entry["advanced"] is False, (
+                f"section={section!r} field={field!r} should be basic (advanced=False)"
+            )
+
+
+def test_advanced_samples_are_marked_advanced(schema):
+    """Sampled advanced fields must have advanced=True."""
+    for section, field_names in ADVANCED_SAMPLES.items():
+        for field in field_names:
+            entry = schema[section][field]
+            assert entry["advanced"] is True, (
+                f"section={section!r} field={field!r} should be advanced (advanced=True)"
+            )
+
+
+def test_hidden_fields_excluded_from_advanced_requirement(schema):
+    """Hidden fields (e.g. missions) are exempt from the advanced check."""
+    for section, fields in schema.items():
+        for field, entry in fields.items():
+            if entry.get("widget") == "hidden":
+                # No advanced key required — just confirm widget is hidden
+                assert entry["widget"] == "hidden"