Simple runner with a few tests to demonstrate the use of JUnit/Mockito in a libGDX application.

Based on http://williammora.com/a-running-game-with-libgdx-part-1.
Added a few tests and made minor changes to the original code.

If you get an error similar to Could not target platform: 'Java SE 12' using tool chain: ..., you need to set the JAVA_HOME environment variable correctly, depending on your local installation (of a Java 12 SDK). On Linux, this can typically be done with export JAVA_HOME="<path>" where <path> typically looks like /usr/lib/jvm/jdk-12.0.2

If you want to build for Android, you will need to install the Android SDK and specify the installation path in the Gradle configuration (e.g., by adding a line similar to sdk.dir=<your_path>/Android/Sdk in a local.properties file at the root of the project).

If you do not want to build for Android but are getting errors related to the missing SDK (since the project is intended to be cross-platform), you will either need to install it anyway (see above) or remove the Android submodule from the Gradle project:

In settings.gradle, remove or comment out 'android' from the following line:

include 'desktop', 'android', 'html', 'core'

Then, in the top-level (at the root of the project) build.gradle file, remove or comment out:

project(":android") {
...
}

If you have errors/issues related to the web version (which hasn't been tested):

In settings.gradle, remove or comment out 'html' from the same line:

include 'desktop', 'android', 'html', 'core'

Then, in the top-level (at the root of the project) build.gradle, remove or comment out:

project(":html") {
...
}