sphinx_docs creates an implicit build_test target. (Note that this is not currently documented.)

https://github.com/bazelbuild/rules_python/blob/f2941df7562c4183c37d6ceeae23e7d390738d58/sphinxdocs/private/sphinx.bzl#L196-L197

This means that commands like bazel test //... always include sphinx_docs targets. For developers (like me) that repeatedly run tests, this is pretty costly, especially given the lack of incremental builds.

Could the implicit _build_test target be removed from sphinx_docs?

I would prefer if sphinx_docs left the policy of whether to build_test each target to users. Since projects don't typically have many sphinx_docs targets, manually adding build_tests as needed should not be burdensome.