fix: fix name_merging_test.dart

src/kaiteki/lib/utils/name_merging.dart

@@ -7,6 +7,9 @@ MergedName? mergeNameOfUser(User user) {
   return mergeName(user.displayName, user.username, user.host);
 }
 
+/// Merges a display name with a username and host.
+///
+/// Returns `null` if the names cannot be merged.
 MergedName? mergeName(String? displayName, String username, String host) {
   final name = displayName ?? username;
   final normalizedDisplay = name.toLowerCase().trim();

src/kaiteki/test/name_merging_test.dart

@@ -1,15 +1,27 @@
 import "package:kaiteki/utils/name_merging.dart";
+import "package:kaiteki_core/model.dart";
 import "package:test/test.dart";
 
 void main() {
   test("separated", () {
-    final content = mergeName("Wonderful Alice", "alice", "example.org");
-    expect(content, isNotNull);
-    expect(content!.$2, equals("@alice@example.org"));
+    const user = User(
+      id: "",
+      displayName: "Wonderful Alice",
+      username: "alice",
+      host: "example.org",
+    );
+    final content = mergeNameOfUser(user);
+    expect(content, isNull);
   });
 
   test("unseparated", () {
-    final content = mergeName("Alice", "alice", "example.org");
+    const user = User(
+      id: "",
+      displayName: "Alice",
+      username: "alice",
+      host: "example.org",
+    );
+    final content = mergeNameOfUser(user);
     expect(content, isNotNull);
     expect(content!.$1, equals("Alice"));
     expect(content.$2, equals("@example.org"));