[ci] Fix WiFi testing mode validation and component splitter for variant-only tests (#11481)

esphome/components/wifi/__init__.py

@@ -213,11 +213,15 @@ def _validate(config):
         if CONF_EAP in config:
             network[CONF_EAP] = config.pop(CONF_EAP)
         if CONF_NETWORKS in config:
-            raise cv.Invalid(
-                "You cannot use the 'ssid:' option together with 'networks:'. Please "
-                "copy your network into the 'networks:' key"
-            )
-        config[CONF_NETWORKS] = cv.ensure_list(WIFI_NETWORK_STA)(network)
+            # In testing mode, merged component tests may have both ssid and networks
+            # Just use the networks list and ignore the single ssid
+            if not CORE.testing_mode:
+                raise cv.Invalid(
+                    "You cannot use the 'ssid:' option together with 'networks:'. Please "
+                    "copy your network into the 'networks:' key"
+                )
+        else:
+            config[CONF_NETWORKS] = cv.ensure_list(WIFI_NETWORK_STA)(network)
 
     if (CONF_NETWORKS not in config) and (CONF_AP not in config):
         config = config.copy()

script/split_components_for_ci.py

@@ -118,8 +118,13 @@ def create_intelligent_batches(
             continue
 
         # Get signature from any platform (they should all have the same buses)
-        # Components not in component_buses were filtered out by has_test_files check
-        comp_platforms = component_buses[component]
+        # Components not in component_buses may only have variant-specific tests
+        comp_platforms = component_buses.get(component)
+        if not comp_platforms:
+            # Component has tests but no analyzable base config - treat as no buses
+            signature_groups[(ALL_PLATFORMS, NO_BUSES_SIGNATURE)].append(component)
+            continue
+
         for platform, buses in comp_platforms.items():
             if buses:
                 signature = create_grouping_signature({platform: buses}, platform)