Expected output in test_struct.wdl unit test does not exist

[stxue1]

The test_struct.wdl unit test has an expected output of test_struct.person, but the workflow itself does not have an output variable named person: https://github.com/openwdl/wdl/blob/9c0b9cf4586508a9e6260cc5c5e562e21f625aac/SPEC.md?plain=1#L1124-L1136

I think instead of expecting test_struct.person, the right output is test_struct.john, as that output from the workflow is missing in the expected output json.