From b855a1dc48027b9f6fd57716191379d20d2de09b Mon Sep 17 00:00:00 2001
From: h7x4 <h7x4@nani.wtf>
Date: Fri, 20 Jun 2025 22:44:26 +0200
Subject: [PATCH] filter_kanji: fix implementation, add test

---
 lib/search/filter_kanji.dart       |  2 +-
 test/search/filter_kanji_test.dart | 32 ++++++++++++++++++++++++++++++
 2 files changed, 33 insertions(+), 1 deletion(-)
 create mode 100644 test/search/filter_kanji_test.dart

diff --git a/lib/search/filter_kanji.dart b/lib/search/filter_kanji.dart
index 6b4e8f3..883318b 100644
--- a/lib/search/filter_kanji.dart
+++ b/lib/search/filter_kanji.dart
@@ -18,6 +18,6 @@ Future<List<String>> filterKanjiWithDbConnection(
   if (deduplicate) {
     return filteredKanji.toList();
   } else {
-    return kanji.where((k) => !filteredKanji.contains(k)).toList();
+    return kanji.where((k) => filteredKanji.contains(k)).toList();
   }
 }
diff --git a/test/search/filter_kanji_test.dart b/test/search/filter_kanji_test.dart
new file mode 100644
index 0000000..e1eb881
--- /dev/null
+++ b/test/search/filter_kanji_test.dart
@@ -0,0 +1,32 @@
+import 'package:jadb/search.dart';
+import 'package:test/test.dart';
+
+import 'setup_database_connection.dart';
+
+void main() {
+  test("Filter kanji", () async {
+    final connection = await setup_database_connection();
+
+    final result = await connection.filterKanji(
+      [
+        "a",
+        "b",
+        "c",
+        "漢",
+        "字",
+        "地",
+        "字",
+        "か",
+        "な",
+        ".",
+        "!",
+        "@",
+        ";",
+        "々",
+      ],
+      deduplicate: false,
+    );
+
+    expect(result.join(), "漢字地字");
+  });
+}