Add first JUnit workspace black box test

- introduce test repository generator class: generates a directory with:

  helper.bzl with the "write_to_file" Starlark rule definition:
  the rule prints [parametrized by generation] text to a file;

  and the BUILD file with a target of "write_to_file" rule,
  and the pkg_tar target, which packs everything in this directory into
  a tar archive;

  so one can use this directory as a source for local_repository or
  produced tar archive as a source for http_archive with file:/// URI,
  and call some platform independent target from the generated repository.

- have a test for test repository generator class

- move one test from workspace_test.sh into WorkspaceBlackBoxTest.java
The test is platform independent, as it uses zero shell scripts.

To be continued, it is a part of verifying that bundled Starlark
repository rules are working on Windows without msys/mingw.

Closes #7591.

PiperOrigin-RevId: 236315683
8 files changed
tree: f26fc9187025e43c2ffed5a8ea18450197ae9931
  1. .bazelci/
  2. examples/
  3. scripts/
  4. site/
  5. src/
  6. third_party/
  7. tools/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. BUILD
  12. CHANGELOG.md
  13. CODEOWNERS
  14. combine_distfiles.py
  15. combine_distfiles_to_tar.sh
  16. compile.sh
  17. CONTRIBUTING.md
  18. CONTRIBUTORS
  19. distdir.bzl
  20. ISSUE_TEMPLATE.md
  21. LICENSE
  22. README.md
  23. WORKSPACE
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