Local testing via ParrelSync

is an open-source project which allows you to open multiple Unity Editor instances, all pointing to the same Unity project (using Symbolic links).

Pros

Short iteration times
Easy to debug since every client is an Editor
Works with Unity versions prior to Unity 6

Cons

Can be more resource demanding than just running builds
Each clone requires the whole project to be duplicated on disk (1 clone means 2x the disk space, and so on). This might be a lot for huge projects.

How to use?

Install as described in their
- UPM Package installation is preferred as coherence supports it out-of-the-box
- If installed via .unitypackage, you need to set by yourself. One way is by adding the following script to an Editor folder in your project:

// Assets/Editor/CoherenceClone.cs
// This script is only needed if you're installing ParrelSync via .unitypackage

using Coherence.Editor;

[InitializeOnLoad]
internal class CoherenceClone
{
  static CoherenceClone()
  {
    CloneMode.Enabled = ParrelSync.ClonesManager.IsClone();
  }
}

Open ParrelSync > Clones Manager. Create a new clone, and open it
Continue development in the main Editor. Don't edit files in clone Editors
Enter Play Mode in each Editor

coherence tells apart ParrelSync clones from the main Editor, so it's easier for you to not edit assets in clones by mistake.

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