Add yarn.lock files, use Yarn during CI build

.gitignore

@@ -7,4 +7,3 @@ logs/
 *.iml
 .idea/
 .nyc_output
-yarn.lock

CONTRIBUTING.md

@@ -29,6 +29,106 @@ accept your pull requests.
 1. Ensure that your code has an appropriate set of unit tests which all pass.
 1. Submit a pull request!
 
+### How to run the tests
+
+1. You must install dependencies at the root of the `nodejs-docs-samples`
+directory. You can do so with `yarn` or `npm`:
+
+        npm install
+
+    or
+
+        yarn install
+
+    **Note:** Use `npm` *or* `yarn` exclusively, don't mix them.
+
+1. In a terminal, start Redis:
+
+        redis-server
+
+1. In another terminal, start `memcached`:
+
+        memcached
+
+1. In another terminal, run the unit tests from the root of the project:
+
+        npm test
+
+    or
+
+        yarn test
+
+    With code coverage:
+
+        npm run cover
+
+    or
+
+        yarn run cover
+
+1. Then run the system tests from the root of the project:
+
+        npm run system-test
+
+    or
+
+        yarn run system-test
+
+    With code coverage:
+
+        npm run system-cover
+
+    or
+
+        yarn run system-cover
+
+1. Or run all the tests at once:
+
+        npm run all-test
+
+    or
+
+        yarn run all-test
+
+    With code coverage:
+
+        npm run all-cover
+
+    or
+
+        yarn run all-cover
+
+### Run the tests for a single sample
+
+1. You must install dependencies at the root of the `nodejs-docs-samples`
+directory. You can do so with `yarn` or `npm`:
+
+        npm install
+
+    or
+
+        yarn install
+
+1. Change directory to one of the sample folders, e.g. `bigquery`:
+
+        cd bigquery/
+
+1. Run the tests (check the `package.json` file):
+
+        npm test
+
+    or
+
+        yarn test
+
+    or
+
+        npm run system-test
+
+    or
+
+        yarn run system-test
+
 ## Style
 
 Samples in this repository follow the [JavaScript Semi-Standard

README.md

@@ -21,7 +21,6 @@ on Google Cloud Platform.
 * [Setup](#setup)
   * [Prerequisites](#prerequisites)
   * [How to run a sample](#how-to-run-a-sample)
-  * [How to run the tests](#how-to-run-the-tests)
 * [Client libraries](#client-libraries)
   * [Google Cloud Node.js client library](#google-cloud-nodejs-client-library)
   * [Google API Node.js client library](#google-api-nodejs-client-library)
@@ -144,40 +143,15 @@ on Google Cloud Platform.
 
         npm install
 
-1. Run the sample:
-
-        node sample_file.js [args]...
-
-### How to run the tests
-
-1. Read the [Contributing Guide][contrib].
-1. In a terminal, start Redis:
-
-        redis-server
-
-1. In another terminal, start `memcached`:
-
-        memcached
+    or
 
-1. In another terminal, run the unit tests from the root of the project:
+        yarn install
 
-        npm test
+    **Note:** Use `npm` *or* `yarn` exclusively, don't mix them.
 
-    or with coverage:
-
-        npm run coverage
-
-1. Then run the system tests from the root of the project:
-
-        npm run system-test
-
-    or with coverage:
-
-        npm run system-cover
-
-1. Or run all the tests at once with coverage:
+1. Run the sample:
 
-        npm run all-cover
+        node sample_file.js [args]...
 
 ## Client libraries
 
@@ -190,7 +164,9 @@ The recommended, idiomatic client for Google Cloud Platform services.
 
 ### <img src="https://avatars0.githubusercontent.com/u/1342004?v=3&s=36" alt="Google logo" title="Google" align="left" height="36" width="36" style="margin-top: 9px;"/>Google API Node.js client library
 
-An older Node.js client library for making REST requests to Google APIs.
+An older Node.js client library for making REST requests to Google APIs. Use
+this for Google Cloud APIs that are not yet supported by the Google Cloud
+Node.js client library.
 
 * [Documentation](http://google.github.io/google-api-nodejs-client/)
 * [Source code](https://github.com/google/google-api-nodejs-client)

appengine/analytics/package.json

@@ -10,7 +10,7 @@
   },
   "scripts": {
     "start": "node app.js",
-    "test": "cd ..; npm run t -- appengine/analytics/test/*.test.js"
+    "test": "cd ../..; npm run t -- appengine/analytics/test/*.test.js"
   },
   "dependencies": {
     "express": "4.14.0",