test: add tests for handleChallengeTitle util (#1566)

Author: huyenltnguyen

mobile-app/test/unit/challenge_utils_test.dart

@@ -0,0 +1,89 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:freecodecamp/models/learn/challenge_model.dart';
+import 'package:freecodecamp/models/learn/curriculum_model.dart';
+import 'package:freecodecamp/ui/views/learn/utils/challenge_utils.dart';
+
+void main() {
+  Challenge createChallenge({
+    required String id,
+    required String title,
+  }) {
+    return Challenge(
+      id: id,
+      block: 'block1',
+      title: title,
+      description: '',
+      instructions: '',
+      dashedName: 'challenge-$id',
+      superBlock: 'superblock',
+      challengeType: 0,
+      tests: [],
+      files: [],
+      helpCategory: HelpCategory.htmlCss,
+      transcript: '',
+      hooks: Hooks(beforeAll: '', beforeEach: '', afterEach: ''),
+    );
+  }
+
+  Block createBlock(List<Challenge> challenges) {
+    return Block(
+      superBlock: SuperBlock(dashedName: 'superblock', name: 'Super Block'),
+      layout: BlockLayout.challengeList,
+      type: BlockType.lecture,
+      name: 'Block 1',
+      dashedName: 'block-1',
+      description: [],
+      challenges: challenges
+          .map((c) => ChallengeOrder(id: c.id, title: c.title))
+          .toList(),
+      challengeTiles: [],
+    );
+  }
+
+  group('handleChallengeTitle', () {
+    test('should return empty string if the block contains a single challenge',
+        () {
+      final challenge = createChallenge(id: '1', title: 'HTML Review');
+      final block = createBlock([challenge]);
+
+      expect(handleChallengeTitle(challenge, block), '');
+    });
+
+    test("should return empty string when challenge title contains 'Dialogue'",
+        () {
+      final challenge = createChallenge(id: '1', title: 'Dialogue 1');
+      final block = createBlock([challenge]);
+
+      expect(handleChallengeTitle(challenge, block), '');
+    });
+
+    test("should return empty string when challenge title contains 'Step'", () {
+      final challenge = createChallenge(id: '1', title: 'Step 1');
+      final other = createChallenge(id: '2', title: 'Task 1');
+      final block = createBlock([challenge, other]);
+
+      expect(handleChallengeTitle(challenge, block), '');
+    });
+
+    test('should return correct Task title with count', () {
+      final dialogue = createChallenge(id: '3', title: 'Dialogue 1');
+      final challenge1 = createChallenge(id: '1', title: 'Task 1');
+      final challenge2 = createChallenge(id: '2', title: 'Task 2');
+      final challenge3 = createChallenge(id: '3', title: 'Task 3');
+      final block = createBlock([dialogue, challenge1, challenge2, challenge3]);
+
+      expect(handleChallengeTitle(challenge1, block), 'Task 1 of 3');
+      expect(handleChallengeTitle(challenge2, block), 'Task 2 of 3');
+      expect(handleChallengeTitle(challenge3, block), 'Task 3 of 3');
+    });
+
+    test('should return correct Step title with count', () {
+      final challenge1 = createChallenge(id: '1', title: 'Intro');
+      final challenge2 = createChallenge(id: '2', title: 'Content');
+      final block = createBlock([challenge1, challenge2]);
+
+      expect(handleChallengeTitle(challenge1, block), 'Step 1 of 2');
+      expect(handleChallengeTitle(challenge2, block), 'Step 2 of 2');
+    });
+  });
+}