Update testb.py

testb.py

@@ -40,4 +40,9 @@ class TestB(datasets.GeneratorBasedBuilder):
         TestBConfig(
             name="data2",
             data_url="./data2",
-        )]
+        )]
+    def _generate_examples(self, data_file, split):
+        with open(data_file, encoding="utf-8") as f:
+            for line in f:
+                row = json.loads(line)
+                yield row