fix: update tests to use emulator logs instead

Author: demolaf

test/e2e/tests/firestore_tests.dart

@@ -98,38 +98,29 @@ void runFirestoreTests(
       await client.deleteDocument('users/$testUserId');
       print('✓ Document deleted successfully');
 
-      // Wait for trigger to fire and write result
+      // Wait for trigger to fire
       await Future<void>.delayed(const Duration(seconds: 2));
 
       // Verify document no longer exists
       final doc = await client.getDocument('users/$testUserId');
       expect(doc, isNull, reason: 'Document should not exist after deletion');
       print('✓ Document deletion verified');
 
-      // Poll for the side-channel result doc written by the handler
-      // (up to 5 attempts × 500ms = 2.5s extra headroom)
-      Map<String, dynamic>? result;
-      for (var i = 0; i < 5; i++) {
-        result = await client.getDocument(
-          'trigger_results/deleted_$testUserId',
-        );
-        if (result != null) break;
-        await Future<void>.delayed(const Duration(milliseconds: 500));
-      }
-
-      expect(
-        result,
-        isNotNull,
-        reason: 'trigger_results doc should have been written by handler',
-      );
+      // Verify handler received the pre-deletion document data by checking
+      // the structured log line emitted by the handler.
+      final emulator = getEmulator();
+      final allLogs = [
+        ...emulator.outputLines,
+        ...emulator.errorLines,
+      ].join('\n');
       expect(
-        result!['fields']['hasData']['booleanValue'],
-        isTrue,
+        allLogs,
+        contains('[onDocumentDeleted] hasData=true'),
         reason: 'event.data should be non-null for delete events',
       );
-      expect(result['fields']['name']['stringValue'], 'To Be Deleted');
-      expect(result['fields']['email']['stringValue'], 'delete@example.com');
-      expect(result['fields']['finalMessage']['stringValue'], 'goodbye');
+      expect(allLogs, contains('name=To Be Deleted'));
+      expect(allLogs, contains('email=delete@example.com'));
+      expect(allLogs, contains('finalMessage=goodbye'));
       print('✓ Handler received correct pre-deletion document data');
     });
 
@@ -309,12 +300,6 @@ void runFirestoreTests(
       } catch (e) {
         // Ignore errors during cleanup
       }
-      // Clean up side-channel result doc written by the onDocumentDeleted handler
-      try {
-        await client.deleteDocument('trigger_results/deleted_$testUserId');
-      } catch (e) {
-        // Ignore errors during cleanup
-      }
     });
   });
 }

test/fixtures/dart_reference/lib/main.dart

@@ -1,6 +1,3 @@
-import 'dart:convert';
-import 'dart:io';
-
 import 'package:firebase_functions/firebase_functions.dart';
 
 // =============================================================================
@@ -187,43 +184,12 @@ void main(List<String> args) async {
       final data = event.data?.data();
       print('Document deleted: users/${event.params['userId']}');
       print('  Final data: $data');
-
-      // write result to Firestore so the e2e test can assert on
-      // what the handler actually received (exposes the old_value/value).
-      final userId = event.params['userId'] as String;
-      final firestoreHost =
-          Platform.environment['FIRESTORE_EMULATOR_HOST'] ?? '127.0.0.1:8080';
-      final parts = firestoreHost.split(':');
-      final host = parts[0];
-      final port = int.tryParse(parts.length > 1 ? parts[1] : '8080') ?? 8080;
-
-      final resultFields = <String, dynamic>{
-        'hasData': {'booleanValue': data != null},
-        'name': {'stringValue': data?['name']?.toString() ?? ''},
-        'email': {'stringValue': data?['email']?.toString() ?? ''},
-        'finalMessage': {
-          'stringValue': data?['finalMessage']?.toString() ?? '',
-        },
-      };
-
-      try {
-        final httpClient = HttpClient();
-        final req = await httpClient.post(
-          host,
-          port,
-          '/v1/projects/demo-test/databases/(default)/documents/'
-          'trigger_results?documentId=deleted_$userId',
-        );
-        req.headers.contentType = ContentType.json;
-        req.write(jsonEncode({'fields': resultFields}));
-        await req.close();
-        httpClient.close();
-      } catch (e) {
-        print(
-          '  Firestore write to verify handler '
-          'received event.data failed: $e',
-        );
-      }
+      print(
+        '[onDocumentDeleted] hasData=${data != null}'
+        ' name=${data?['name']}'
+        ' email=${data?['email']}'
+        ' finalMessage=${data?['finalMessage']}',
+      );
     });
 
     firebase.firestore.onDocumentWritten(document: 'users/{userId}', (