public AssetManager getAssetManager() {
        if (assetManager == null) {
            assetManager = createAssetManager();
        }

        return assetManager;
    }
This class provides some utility functions to properly test the jMonkeyEngine.<br>
It contains simple methods to get and create a headless assetManager amongst other things.<br>
In comparison to {@link BaseTest} it provides a DesktopAssetManager capable of loading image formats using AWT, which
however makes those tests unsuitable for headless ci testing. This requires jme3-desktop to be a testRuntime dependency.

@author MeFisto94
jme3-terrain/src/test/java/com/jme3/terrain/collision/BaseAWTTest.java