Add CI (#1)

.bazelrc

@@ -21,5 +21,9 @@ build --sandbox_default_allow_network=false
 # Docs: https://bazel.build/reference/command-line-reference#flag--host_jvm_args
 startup --host_jvm_args=-DBAZEL_TRACK_SOURCE_DIRECTORIES=1
 
+# Enable runfiles symlink tree for rules_jest.
+# Docs: https://bazel.build/reference/command-line-reference#flag--enable_runfiles
+build --enable_runfiles
+
 # This bazelrc file can be used for user-specific custom build settings.
 try-import %workspace%/.user.bazelrc

.github/workflows/ci.bazelrc

@@ -0,0 +1,25 @@
+# This file contains Bazel settings to apply on CI only.
+# It is referenced with a --bazelrc option in the call to bazel in ci.yaml
+
+# Announce all announces command options read from the bazelrc file(s) when starting up at the
+# beginning of each Bazel invocation. This is very useful on CI to be able to inspect what Bazel rc
+# settings are being applied on each run.
+# Docs: https://bazel.build/docs/user-manual#announce-rc
+build --announce_rc
+
+# Directories caches by GitHub actions
+common:local --disk_cache=~/.cache/bazel-disk-cache
+common --repository_cache=~/.cache/bazel-repository-cache
+
+# Output test errors to stderr so users don't have to `cat` or open test failure log files when test
+# fail. This makes the log noiser in exchange for reducing the time-to-feedback on test failures for
+# users.
+# Docs: https://bazel.build/docs/user-manual#test-output
+test --test_output=errors
+
+# Bazel-in-bazel support
+test --test_env=XDG_CACHE_HOME
+
+# Use colors to highlight output on the screen. Set to `no` if your CI does not display colors.
+# Docs: https://bazel.build/docs/user-manual#color
+build --color=yes

.github/workflows/ci.yaml

@@ -0,0 +1,65 @@
+name: CI
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+    branches: [main]
+
+  workflow_dispatch:
+
+concurrency:
+  # Cancel previous actions from the same PR: https://stackoverflow.com/a/72408109
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  test:
+    runs-on: ${{ matrix.os }}
+
+    strategy:
+      fail-fast: false
+      matrix:
+        os: ['ubuntu-latest', 'windows-latest', 'macos-latest']
+
+    steps:
+      - uses: actions/checkout@v4
+
+      # Cache build artifacts so that the next ci build is incremental.
+      # Because github action caches cannot be updated after a build, we need to
+      # store the contents of each build in a unique cache key, then fall back to loading
+      # it on the next ci run. We use hashFiles(...) in the key and restore-keys- with
+      # the prefix to load the most recent cache for the branch on a cache miss. You
+      # should customize the contents of hashFiles to capture any bazel input sources,
+      # although this doesn't need to be perfect. If none of the input sources change
+      # then a cache hit will load an existing cache and bazel won't have to do any work.
+      # In the case of a cache miss, you want the fallback cache to contain most of the
+      # previously built artifacts to minimize build time. The more precise you are with
+      # hashFiles sources the less work bazel will have to do.
+      # We do not cache downloaded external artifacts as these are generally
+      # faster to download again than to fetch them from the GitHub actions
+      # cache.
+      - name: Mount bazel caches
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cache/bazel-disk-cache
+            ~/.cache/bazel-repository-cache
+            ~/.cache/xdg-cache
+          key: >-
+            bazel-cache-${{ matrix.os }}-
+            ${{ hashFiles('.bazelrc', '.bazelversion', '**/BUILD', '**/BUILD.bazel', '**/*.bzl', 'WORKSPACE', 'WORKSPACE.bazel', 'WORKSPACE.bzlmod', 'MODULE.bazel', 'MODULE.bazel.lock') }}
+          restore-keys: |
+            bazel-cache-${{ matrix.os }}-
+
+      # See https://github.com/bazel-contrib/publish-to-bcr#including-patches
+      - name: verify bcr patches
+        if: hashFiles('.bcr/patches/*.patch') != ''
+        run: patch --dry-run -p1 < .bcr/patches/*.patch
+
+      - name: bazel test //...
+        run: bazel --bazelrc=.github/workflows/ci.bazelrc test //...
+        env:
+          ASPECT_RULES_JS_FROZEN_PNPM_LOCK: 1
+          # bazelisk will download bazel to here
+          XDG_CACHE_HOME: ~/.cache/xdg-cache

examples/calculator/BUILD.bazel

@@ -22,6 +22,10 @@ cc_library(
 
 jest_test(
     name = "calculator_test",
+    args = [
+        "--runTestsByPath",
+        "%s/calculator.test.js" % package_name(),
+    ],
     data = [
         ":bindings",
         ":calculator.test.js",

examples/hello_world/BUILD.bazel

@@ -8,6 +8,10 @@ node_extension(
 
 jest_test(
     name = "hello_world_test",
+    args = [
+        "--runTestsByPath",
+        "%s/hello_world.test.js" % package_name(),
+    ],
     data = [
         ":hello_world",
         ":hello_world.test.js",