Cesium-Prequel/Specs/Scene/TileImagerySpec.js

import { ImageryState } from "../../Source/Cesium.js";
import { TileImagery } from "../../Source/Cesium.js";

describe("Scene/TileImagery", function () {
  it("does not use ancestor ready imagery that needs to be reprojected", function () {
    var imageryLayer = {
      _calculateTextureTranslationAndScale: function () {},
    };

    var grandparentImagery = {
      imageryLayer: imageryLayer,
      level: 0,
      x: 0,
      y: 0,
      state: ImageryState.READY,
      texture: {},
      textureWebMercator: {},
      addReference: function () {},
    };

    var parentImagery = {
      imageryLayer: imageryLayer,
      parent: grandparentImagery,
      level: 1,
      x: 0,
      y: 0,
      state: ImageryState.READY,
      texture: undefined,
      textureWebMercator: {},
      processStateMachine: function () {
        ++this.processStateMachineCalls;
      },
      processStateMachineCalls: 0,
      addReference: function () {},
    };

    var thisImagery = {
      imageryLayer: imageryLayer,
      parent: parentImagery,
      level: 2,
      x: 0,
      y: 0,
      state: ImageryState.FAILED,
      processStateMachine: function () {},
      addReference: function () {},
    };

    // This TileImagery needs reprojected imagery, and:
    // * thisImagery has failed
    // * parentImagery needs to be reprojected
    // * grandparentImagery is good to go
    // When we process the state machine, it should selected grandparentImagery for rendering
    // and process the state machine of parentImagery.
    var tileImagery = new TileImagery(thisImagery, undefined, false);

    tileImagery.processStateMachine({}, {});

    expect(tileImagery.readyImagery).toBe(grandparentImagery);
    expect(parentImagery.processStateMachineCalls).toBe(1);
  });
});