private static Stream<Arguments> testParameters() {
        return Stream.of(
            Arguments.of("LowRoughness", 0.1f, false),
            Arguments.of("HighRoughness", 1.0f, false),
            Arguments.of("DefaultDirectionalLight", 0.5f, false),
            Arguments.of("UpdatedDirectionalLight", 0.5f, true)
        );
    }
Screenshot tests for PBR lighting.

@author nehon - original test
@author Richard Tingle (aka richtea) - screenshot test adaptation
jme3-screenshot-tests/src/test/java/org/jmonkeyengine/screenshottests/light/pbr/TestPBRLighting.java