How to use rules_webtesting?

Question

I want to use https://github.com/bazelbuild/rules_webtesting. I am using Bazel 5.2.0.

The whole project can be found here.

My WORKSPACE.bazel file looks like this:

load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")

http_archive(
    name = "io_bazel_rules_webtesting",
    sha256 = "3ef3bb22852546693c94e9b0b02c2570e74abab6f800fd58e0cbe79492e49c1b",
    urls = [
        "https://github.com/bazelbuild/rules_webtesting/archive/581b1557e382f93419da6a03b91a45c2ac9a9ec8/rules_webtesting.tar.gz",
    ],
)

load("@io_bazel_rules_webtesting//web:repositories.bzl", "web_test_repositories")

web_test_repositories()

My BUILD.bazel file looks like this:

load("@io_bazel_rules_webtesting//web:py.bzl", "py_web_test_suite")

py_web_test_suite(
    name = "browser_test",
    srcs = ["browser_test.py"],
    browsers = [
        "@io_bazel_rules_webtesting//browsers:chromium-local",
    ],
    local = True,
    deps = ["@io_bazel_rules_webtesting//testing/web"],
)

browser_test.py looks like this:

import unittest
from testing.web import webtest


class BrowserTest(unittest.TestCase):
  def setUp(self):
    self.driver = webtest.new_webdriver_session()

  def tearDown(self):
    try:
      self.driver.quit()
    finally:
      self.driver = None

  # Your tests here

if __name__ == "__main__":
  unittest.main()

When I try to do a bazel build //... I get (under Ubuntu 20.04 and macOS):

INFO: Invocation ID: 74c03efd-9caa-4174-9fda-42f7ff37e38b
ERROR: error loading package '': Every .bzl file must have a corresponding package, but '@io_bazel_rules_webtesting//web:repositories.bzl' does not have one. Please create a BUILD file in the same or any parent directory. Note that this BUILD file does not need to do anything except exist.
INFO: Elapsed time: 0.038s
INFO: 0 processes.
FAILED: Build did NOT complete successfully (0 packages loaded)

The error message does not make sense to me, since there is a BUILD file in https://github.com/bazelbuild/rules_webtesting/blob/581b1557e382f93419da6a03b91a45c2ac9a9ec8/BUILD.bazel and https://github.com/bazelbuild/rules_webtesting/blob/581b1557e382f93419da6a03b91a45c2ac9a9ec8/web/BUILD.bazel.

I also tried a different version of Bazel - but with the same result.

Any ideas on how to get this working?

score 3 · Accepted Answer · answered Jun 22 '22 at 21:46

You need to add a strip_prefix = "rules_webtesting-581b1557e382f93419da6a03b91a45c2ac9a9ec8" in your http_archive call.

For debugging, you can look in the folder where Bazel extracts it: bazel-out/../../../external/io_bazel_rules_webtesting. @io_bazel_rules_webtesting//web translates to bazel-out/../../../external/io_bazel_rules_webtesting/web, so if that folder doesn't exist things won't work.

How to use rules_webtesting?

1 Answers1