Minor test change.

tests/io/test_json.py

@@ -55,8 +55,10 @@ def test_write_stream_json(tmpdir):
 
     with BufferingNodeExecutionContext(LdjsonWriter(filename),
                                        services=services) as context:
-        context.write_sync({'foo': 'bar'})
+        context.write_sync(
-        context.write_sync({'baz': 'boz'})
+            {'foo': 'bar'},
+            {'baz': 'boz'},
+        )
 
     expected = '''{"foo": "bar"}\n{"baz": "boz"}\n'''
     with fs.open(filename) as fin: