This is a Shader Testing Scene I've created for testing my node setups using a stable environment. Please be aware that there is no HDRI included, though there is a IBL node setup prepared.
Delete the placeholder lighting and drop in any HDRI available to you.
The IBL setup features separate settings concerning primary (direct) and secondary (indirect) illumination. Also there are some settings for mixing, based on light paths, available.
The shader object is animated for an easy setup of different viewing angles. Use the text object to include your shader name into your rendering. Also the floor material uses a switch to choose from a light and dark texture pattern.
Use any of your HDRIs and have fun testing your shaders!