text: import { Cartesian3 } from "../../Source/Cesium.js";
  import { CircleEmitter } from "../../Source/Cesium.js";
  import { Particle } from "../../Source/Cesium.js";
  
  describe("Scene/CircleEmitter", function () {
    let emitter;
  
    it("default constructor", function () {
      emitter = new CircleEmitter();
      expect(emitter.radius).toEqual(1.0);
    });
  
    it("constructor", function () {
      emitter = new CircleEmitter(5.0);
      expect(emitter.radius).toEqual(5.0);
    });
  
    it("constructor throws with invalid radius", function () {
      expect(function () {
        emitter = new CircleEmitter(0.0);
      }).toThrowDeveloperError();
      expect(function () {
        emitter = new CircleEmitter(-1.0);
      }).toThrowDeveloperError();
    });
  
    it("radius setter", function () {
      emitter = new CircleEmitter();
      emitter.radius = 5.0;
      expect(emitter.radius).toEqual(5.0);
    });
  
    it("radius setter throws with invalid value", function () {
      emitter = new CircleEmitter();
      expect(function () {
        emitter.radius = undefined;
      }).toThrowDeveloperError();
      expect(function () {
        emitter.radius = 0.0;
      }).toThrowDeveloperError();
      expect(function () {
        emitter.radius = -1.0;
      }).toThrowDeveloperError();
    });
  
    it("emits", function () {
      emitter = new CircleEmitter(5.0);
      const particle = new Particle();
  
      for (let i = 0; i < 1000; ++i) {
        emitter.emit(particle);
        expect(Cartesian3.magnitude(particle.position)).toBeLessThanOrEqualTo(
          emitter.radius
        );
        expect(particle.position.z).toEqual(0.0);
        expect(particle.velocity).toEqual(Cartesian3.UNIT_Z);
      }
    });
  });
  