test: Add unit test for projects/app/src/pages/api/core/dataset/paths.ts (#4349)

* Add unit tests for the getParents function in the dataset paths API.

* Update paths.ts

---------

Co-authored-by: gru-agent[bot] <185149714+gru-agent[bot]@users.noreply.github.com>
Co-authored-by: Archer <545436317@qq.com>

test/cases/pages/api/core/dataset/paths.test.ts

@@ -0,0 +1,82 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { getParents } from '@/pages/api/core/dataset/paths';
+import { MongoDataset } from '@fastgpt/service/core/dataset/schema';
+
+vi.mock('@fastgpt/service/core/dataset/schema', () => ({
+  MongoDataset: {
+    findById: vi.fn()
+  },
+  DatasetCollectionName: 'datasets'
+}));
+
+describe('getParents', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  it('should return empty array if parentId is undefined', async () => {
+    const result = await getParents(undefined);
+    expect(result).toEqual([]);
+  });
+
+  it('should return empty array if parent not found', async () => {
+    vi.mocked(MongoDataset.findById).mockResolvedValueOnce(null);
+
+    const result = await getParents('non-existent-id');
+    expect(result).toEqual([]);
+  });
+
+  it('should return single parent path if no further parents', async () => {
+    vi.mocked(MongoDataset.findById).mockResolvedValueOnce({
+      name: 'Parent1',
+      parentId: undefined
+    });
+
+    const result = await getParents('parent1-id');
+
+    expect(result).toEqual([{ parentId: 'parent1-id', parentName: 'Parent1' }]);
+  });
+
+  it('should return full parent path for nested parents', async () => {
+    vi.mocked(MongoDataset.findById)
+      .mockResolvedValueOnce({
+        name: 'Child',
+        parentId: 'parent1-id'
+      })
+      .mockResolvedValueOnce({
+        name: 'Parent1',
+        parentId: 'parent2-id'
+      })
+      .mockResolvedValueOnce({
+        name: 'Parent2',
+        parentId: undefined
+      });
+
+    const result = await getParents('child-id');
+
+    expect(result).toEqual([
+      { parentId: 'parent2-id', parentName: 'Parent2' },
+      { parentId: 'parent1-id', parentName: 'Parent1' },
+      { parentId: 'child-id', parentName: 'Child' }
+    ]);
+  });
+
+  it('should handle circular references gracefully', async () => {
+    vi.mocked(MongoDataset.findById)
+      .mockResolvedValueOnce({
+        name: 'Node1',
+        parentId: 'node2-id'
+      })
+      .mockResolvedValueOnce({
+        name: 'Node2',
+        parentId: 'node1-id' // Circular reference
+      });
+
+    const result = await getParents('node1-id');
+
+    expect(result).toEqual([
+      { parentId: 'node2-id', parentName: 'Node2' },
+      { parentId: 'node1-id', parentName: 'Node1' }
+    ]);
+  });
+});