c49f40fd9a units: Test C-COMMON-TRAITS (Tobin C. Harding)
Pull request description:
Add structs to the `api` integration test file that verify the set of common traits.
ACKs for top commit:
apoelstra:
ACK c49f40fd9af1b9446a7c9a35aefdc02b30801275; successfully ran local tests; good idea!
Tree-SHA512: bc60ed8912e705d4c07714e9d19c0eee4fb2eb6be17a6ee67c2bb922ea27ef3a737eda3f7de690fa3a9fa364c34029989f20361d03f706fd3152ec4f20f33aab