Currently some files have a copyright header and some don’t. There is no check for this.
Not sure for which files we want to enforce copyright headers, if any at all. However if we do it for any files, it should be enforced by CI. See also the section “Copyright” in https://github.com/bitcoin/bitcoin/blob/master/CONTRIBUTING.md#copyright
So implement a check for this and add a config file to the test/lint/
directory.
Can be tested by emptying the config file and calling (cd test/lint/test_runner/ && cargo run)
.