Try to fix tests

src/Engines/nullEngine.ts

@@ -126,8 +126,6 @@ export class NullEngine extends Engine {
         this._caps.vertexArrayObject = false;
         this._caps.instancedArrays = false;
 
-        this._highPrecisionShadersAllowed = true;
-
         Logger.Log(`Babylon.js v${Engine.Version} - Null engine`);
 
         // Wrappers

tests/validation/validation.js

@@ -371,7 +371,7 @@ function init() {
     canvas = document.createElement("canvas");
     canvas.className = "renderCanvas";
     document.body.appendChild(canvas);
-    engine = new BABYLON.Engine(canvas, false);
+    engine = new BABYLON.Engine(canvas, false, { useHighPrecisionFloats: true });
     engine.enableOfflineSupport = false;
     engine.setDitheringState(false);
 }