purl-next: Create VERS tests for registered version schemes using JSON

[pombredanne]

We need to extend the VERS JSON test suite for registered VERS schemes. This means migrating existing tests, as well as integrating examples and creating new tests using the new JSON schema for tests.

[pombredanne]

This is completed with this PR:

• Add schema for VERS tests package-url/vers-spec#26

We have these types of test defined in the schema:

• build test: A VERS building test from decoded components to a canonical VERS string.
• parse test: A VERS parsing test from a VERS string to decoded scheme and constraints list.
• roundtrip test: A VERS roundtrip test, parsing then building back a VERS from a canonical string input.
• merge test: A VERS merging test from an array of VERS strings to a canonical VERS string.
• containment test: A VERS containment to test if a bare version string is comtained in the range of a VERS string.

[pombredanne]

This is informed by the existing univers tests:

Porting the tests to the new format should consider this:

• from_native for these:

  • data_source may be in the style of: https://gitlab.com/gitlab-org/advisories-community/-/tree/main/packagist and different for each source
  • https://github.com/aboutcode-org/univers/blob/main/tests/data/composer_gitlab.json
  • https://github.com/aboutcode-org/univers/blob/main/tests/data/npm_gitlab.json
  • https://github.com/aboutcode-org/univers/blob/main/tests/data/conan_advisory.json
  • https://github.com/aboutcode-org/univers/blob/main/tests/data/composer_gitlab.json
  • https://github.com/aboutcode-org/univers/blob/main/tests/data/gem_gitlab.json
  • https://github.com/aboutcode-org/univers/blob/main/tests/data/go_gitlab.json
  • https://github.com/aboutcode-org/univers/blob/main/tests/data/pypi_gitlab.json
  • This may be from npm instead of gitlab?: https://github.com/aboutcode-org/univers/blob/main/tests/data/npm_advisory.json

• comparison or equality for:

  • https://github.com/aboutcode-org/univers/blob/main/tests/data/alpine_test.txt
  • https://github.com/aboutcode-org/univers/blob/main/tests/data/rpmvercmp.at
  • https://github.com/aboutcode-org/univers/blob/main/tests/data/openssl/openssl_all_versions.txt
  • https://github.com/aboutcode-org/univers/blob/main/tests/nuget/test_nuget_version_comparer.py

• parse and build for:

  • https://github.com/aboutcode-org/univers/blob/main/tests/data/test-suite-data.json

And TBD for most of the Python tests in

• https://github.com/aboutcode-org/univers/tree/main/tests/nuget
• https://github.com/aboutcode-org/univers/tree/main/tests/

Originally posted by @pombredanne in #6

[pombredanne]

• The PR at Use VERS test definition schema for tests univers#162 has the tests now in the JSON schema format of purl-next: Create new JSON schema for VERS tests #6
• As follow up to this there is some extra work in the core vers spec:
  • Create JSON reference test suite package-url/vers-spec#27
  • and in univers Use gitmodule to get tests from vers-spec directly univers#163