CB-12859: document how to run the native tests. add a README to the test/ project.

README.md

@@ -62,3 +62,9 @@ These commands live in a generated Cordova Android project. Any interactions wit
 
 1. Create a project
 2. Import it via "Non-Android Studio Project"
+
+## Running the Native Tests
+
+The `test/` directory in this project contains an Android test project that can
+be used to run different kinds of native tests. Check out the
+[README contained therein](test/README.md) for more details!

test/README.md

@@ -0,0 +1,58 @@
+<!--
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you 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.
+#
+-->
+
+# Cordova Android Test Project
+
+The project in this directory is an Android Test project that enables those
+interested in further developing cordova-android to validate their changes.
+
+## Requirements
+
+The requirements in the [top-level README](../README.md) still apply. In
+addition, ensure you have installed Gradle, and that it is (at the time of this
+writing) at least version 3.3 or newer.
+
+## Getting Started
+
+You can run this test project from both the command line as well as from
+Android Studio.
+
+### Command Line
+
+Ensure you have the gradle wrapper script, `gradlew`, in this directory. If
+you do not, you can run the following to generate it:
+
+    $ cd cordova-android/test
+    $ gradle :wrapper -b build.gradle
+
+You can then see a list of all tasks available to run with `gradlew tasks`.
+
+The two different kinds of tests one typically wants to run are unit tests and
+end-to-end, or instrumented, tests. Unit tests do not require any particular
+environment to run in, but the instrumented tests, however, require a connected
+Android device or emulator to run in.
+
+To run the unit tests, run: `gradlew test`.
+To run the instrumented tests, run: `gradlew connectedAndroidTest`.
+
+### Android Studio
+
+Import this `test/` directory into Android Studio, and hit the Play button.