These fixtures are copied from the https://github.com/distribution/reference repo.
As such, the test cases are governed by the Apache-2 license at https://github.com/distribution/reference/blob/main/LICENSE.

[./references/valid/inputs.txt](./references/valid/inputs.txt) and [./references/valid/inputs.txt](./references/invalid/inputs.txt) are drawn from https://github.com/distribution/reference/blob/main/reference_test.go