Add tests

test/search/kanji_search_test.dart

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+import 'package:jadb/jouyou_kanji.dart';
+import 'package:test/test.dart';
+
+import 'setup_database_connection.dart';
+
+void main() {
+  test("Search a kanji", () async {
+    final connection = await setup_database_connection();
+
+    final result = await connection.searchKanji('漢');
+    expect(result, isNotNull);
+  });
+
+  group("Search all jouyou kanji", () {
+    JOUYOU_KANJI.forEach((grade, characters) {
+      test("Search all kanji in grade $grade", () async {
+        final connection = await setup_database_connection();
+
+        for (final character in characters) {
+          final result = await connection.searchKanji(character);
+          expect(result, isNotNull);
+        }
+      }, timeout: Timeout.factor(10));
+    });
+  });
+}

test/search/setup_database_connection.dart

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+import 'dart:ffi';
+import 'dart:io';
+
+import 'package:jadb/search.dart';
+import 'package:sqflite_common_ffi/sqflite_ffi.dart';
+import 'package:sqlite3/open.dart';
+
+Future<JaDBConnection> setup_database_connection() async {
+  final lib_sqlite_path = Platform.environment['LIBSQLITE_PATH'];
+  final jadb_path = Platform.environment['JADB_PATH'];
+
+  if (lib_sqlite_path == null) {
+    throw Exception("LIBSQLITE_PATH is not set");
+  }
+
+  if (jadb_path == null) {
+    throw Exception("JADB_PATH is not set");
+  }
+
+  final db_connection = createDatabaseFactoryFfi(ffiInit: () {
+    open.overrideForAll(
+      () => DynamicLibrary.open(lib_sqlite_path),
+    );
+  }).openDatabase(
+    jadb_path,
+    options: OpenDatabaseOptions(
+      onOpen: (db) {
+        db.execute("PRAGMA foreign_keys = ON");
+      },
+    ),
+  );
+
+  return JaDBConnection(await db_connection);
+}

test/search/word_search_test.dart

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+import 'package:test/test.dart';
+
+import 'setup_database_connection.dart';
+
+void main() {
+  test("Search a word", () async {
+    final connection = await setup_database_connection();
+
+    final result = await connection.searchWord("kana");
+    expect(result, isNotNull);
+  });
+
+  test(
+    "Serialize all words",
+    () async {
+      final connection = await setup_database_connection();
+
+      // Test serializing all words
+      for (final letter in "aiueoksthnmyrw".split("")) {
+        await connection.searchWord(letter);
+      }
+    },
+    timeout: Timeout.factor(100),
+    skip: "Very slow test",
+  );
+}