chore: import upstream snapshot with attribution

tests/llm/test_dataset.py

@@ -0,0 +1,19 @@
+import unittest
+
+from swift.dataset import load_dataset
+
+
+class TestDataset(unittest.TestCase):
+
+    def test_load_v_dataset(self):
+        if not __name__ == '__main__':
+            # ignore citest error in github
+            return
+
+        for ds in ['m3it#1000', 'mantis-instruct#1000', 'llava-med-zh-instruct#1000']:
+            ds = load_dataset(ds)
+            assert len(ds[0]) > 800
+
+
+if __name__ == '__main__':
+    unittest.main()