python,runfiles library: don't pick up TEST_SRCDIR

The Python runfiles library will no longer pick up
the runfiles directory from $TEST_SRCDIR.

This is in accordance with the Java runfiles
library, see the motivation in
https://github.com/bazelbuild/bazel/issues/4598

The commit also adds a test for this functionality
as well as exercising that the runfiles library
can find the runfiles directory even if no
RUNFILES_* envvars are exported.

See https://github.com/bazelbuild/bazel/issues/4598
See https://github.com/bazelbuild/bazel/issues/4460

Change-Id: I6e4d154cdca66b29d7c6e77743cf8109638238b5
PiperOrigin-RevId: 185009819
3 files changed
tree: 504e871ad2ba85d4667d1b59b383081e2f8029ee
  1. examples/
  2. scripts/
  3. site/
  4. src/
  5. third_party/
  6. tools/
  7. .gitattributes
  8. .gitignore
  9. AUTHORS
  10. BUILD
  11. CHANGELOG.md
  12. combine_distfiles.py
  13. combine_distfiles_to_tar.sh
  14. compile.sh
  15. CONTRIBUTING.md
  16. CONTRIBUTORS
  17. ISSUE_TEMPLATE.md
  18. LICENSE
  19. README.md
  20. WORKSPACE
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