def test_write_string_value():
json_serialization_writer = JsonSerializationWriter()
json_serialization_writer.write_string_value("displayName", "Adele Vance")
stream = json_serialization_writer.get_serialized_content()
content = stream.read()
content_string = content.decode('utf-8')
assert content_string == '{"displayName": "Adele Vance"}'
def test_write_string_value_no_key():
json_serialization_writer = JsonSerializationWriter()
value = json_serialization_writer.write_string_value(None, "Adele Vance")
assert value == "Adele Vance"