Rules for running jest tests

defs.bzl

@@ -23,6 +23,7 @@ load("//internal/node:node.bzl",
      _nodejs_test = "nodejs_test_macro")
 load("//internal/node:node_repositories.bzl",_node_repositories = "node_repositories")
 load("//internal/jasmine_node_test:jasmine_node_test.bzl", _jasmine_node_test = "jasmine_node_test")
+load("//internal/nodejs_jest_test:nodejs_jest_test.bzl", _nodejs_jest_test = "nodejs_jest_test")
 load("//internal/npm_install:npm_install.bzl", _npm_install = "npm_install", _yarn_install = "yarn_install")
 load("//internal/rollup:rollup_bundle.bzl", _rollup_bundle = "rollup_bundle")
 load("//internal/npm_package:npm_package.bzl", _npm_package = "npm_package")
@@ -41,6 +42,7 @@ rollup_bundle = _rollup_bundle
 npm_package = _npm_package
 history_server = _history_server
 http_server = _http_server
+nodejs_jest_test = _nodejs_jest_test
 # ANY RULES ADDED HERE SHOULD BE DOCUMENTED, run yarn skydoc to verify
 
 check_rules_nodejs_version = _check_rules_nodejs_version

internal/nodejs_jest_test/BUILD

@@ -0,0 +1,21 @@
+# Copyright 2017 The Bazel Authors. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+package(default_visibility = ["//visibility:public"])
+
+exports_files([
+    "jest_runner.js",
+    # Exported to be consumed for generating skydoc.
+    "nodejs_jest_test.bzl",
+])

internal/nodejs_jest_test/jest_runner.js

@@ -0,0 +1,33 @@
+jest = require('jest')
+fs = require('fs-extra')
+path = require('path')
+process = require('process')
+
+// [0], [1] is node executable and script path
+npm_ws_name = process.argv[2]
+package_name = process.argv[3]
+
+var packageJson = {
+	jest: {
+		modulePaths: [
+			path.join(process.cwd(),
+				'external/{}/node_modules'.replace('{}', npm_ws_name))
+		]
+	}
+}
+
+console.log('Current directory ' + process.cwd())
+
+
+console.log('Changing directory to ' + package_name)
+process.chdir(package_name)
+
+console.log('Writing package.json for jest')
+fs.writeFileSync('package.json', JSON.stringify(packageJson));
+
+console.log('Copying tests over temp directory')
+fs.copySync('tests', 'jest', {
+	dereference: true,
+});
+
+jest.run();

internal/nodejs_jest_test/nodejs_jest_test.bzl

@@ -0,0 +1,64 @@
+# Copyright 2017 The Bazel Authors. All rights reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Jest testing for NodeJS
+
+These rules let you run tests with facebook/jest.
+"""
+load("//internal/node:node.bzl", "nodejs_test")
+
+def nodejs_jest_test(
+    name,
+    srcs = [],
+    data = [],
+    deps = [],
+    **kwargs):
+    """Runs test with a jest.
+
+    Args:
+        name: Name of the resulting label
+        srcs: JavaScript source files containing jest tests
+        data: Runtime dependencies which will be loaded while the test executes
+        deps: Other targets which produce JavaScript; should contain `jest` and `fs-extra`
+        **kwargs: remaining arguments are passed to the test rule
+    """
+
+    npm_repo_workspace_name = None
+    fs_extra_dep_name = None
+
+    for dep in deps:
+        if dep.endswith('//jest'):
+            npm_repo_workspace_name = dep.replace('//jest', '').replace('@', '')
+        elif dep.endswith('//fs-extra'):
+            fs_extra_dep_name = dep
+
+    if not npm_repo_workspace_name:
+        fail('jest is not found in `deps`, please include it')
+
+    if not fs_extra_dep_name:
+        fail('fs-extra is not found in `deps`, please include it')
+
+    all_data = data + srcs + deps
+    all_data += [Label("//internal/nodejs_jest_test:jest_runner.js")]
+    all_data += [Label("@bazel_tools//tools/bash/runfiles")]
+    entry_point = "build_bazel_rules_nodejs/internal/nodejs_jest_test/jest_runner.js"
+
+
+    nodejs_test(
+        name = name,
+        data = all_data,
+        entry_point = entry_point,
+        templated_args = [npm_repo_workspace_name, native.package_name()],
+        **kwargs
+    )

internal/test/package.json

@@ -1,8 +1,10 @@
 {
   "description": "runtime dependencies for tests",
   "devDependencies": {
+    "fs-extra": "^7.0.0",
     "is-builtin-module": "^2.0.0",
     "jasmine": "~2.8.0",
+    "jest": "^23.6.0",
     "node_resolve_index": "file:./node_resolve_index",
     "node_resolve_index_2": "file:./node_resolve_index_2",
     "node_resolve_index_3": "file:./node_resolve_index_3",