toGraph

toGraph is a function that allows you to convert a THREE.js object into a simple NgtTestGraphObject.

This is useful for snapshot testing as it at least provides the scene graph structure.

Caution

In many cases, we can use toJSON on the THREE.js object to better structure. However, this is not always possible

• The uuid property will always be different for each test run making it difficult to do snapshot testing
• Some THREE.objects do not have toJSON method and will throw an error when we try to call scene.toJSON() from the root

const { fixture, toGraph } = NgtTestBed.create(SceneGraph);
fixture.detectChanges();

expect(toGraph()).toMatchSnapshot();

/**
 * For a scene with a single mesh
 *
 * [
 *   {
 *     "type": "Mesh",
 *     "name": "",
 *     "children": []
 *   }
 * ]
 */