Test for Background (#438)

* test: test for background

packages/core/tests/Background.test.ts

@@ -0,0 +1,70 @@
+import { WebCanvas, WebGLRenderer } from "../../rhi-webgl";
+import { Engine, Texture2D } from "../src";
+import { BackgroundTextureFillMode } from "../src/enums/BackgroundTextureFillMode";
+
+describe("Background Test", function () {
+  const hardwareRenderer = new WebGLRenderer();
+  const canvas = new WebCanvas(document.createElement("canvas"));
+  canvas.width = 100;
+  canvas.height = 100;
+  const engine = new Engine(canvas, hardwareRenderer);
+  const scene = engine.sceneManager.activeScene;
+  it("set texture should be success", () => {
+    const texture = new Texture2D(engine, 50, 100);
+    scene.background._resizeBackgroundTexture();
+    scene.background.texture = texture;
+    expect(scene.background.texture).toEqual(texture)
+    scene.background.texture = texture;
+    expect(scene.background.texture).toEqual(texture);
+    expect(scene.background.textureFillMode).toEqual(BackgroundTextureFillMode.AspectFitHeight);
+    scene.background.textureFillMode = BackgroundTextureFillMode.AspectFitHeight;
+    expect(scene.background.textureFillMode).toEqual(BackgroundTextureFillMode.AspectFitHeight);
+  });
+  it("set texture fill should be success", () => {
+    scene.background.textureFillMode = BackgroundTextureFillMode.Fill;
+    const positions = engine._backgroundTextureMesh.getPositions();
+    expect(positions[0].x).toBeCloseTo(-1);
+    expect(positions[0].y).toBeCloseTo(-1);
+
+    expect(positions[1].x).toBeCloseTo(1);
+    expect(positions[1].y).toBeCloseTo(-1);
+
+    expect(positions[2].x).toBeCloseTo(-1);
+    expect(positions[2].y).toBeCloseTo(1);
+
+    expect(positions[3].x).toBeCloseTo(1);
+    expect(positions[3].y).toBeCloseTo(1);
+  });
+
+  it("set texture fill should be success", () => {
+    scene.background.textureFillMode = BackgroundTextureFillMode.AspectFitHeight;
+    const positions = engine._backgroundTextureMesh.getPositions();
+    expect(positions[0].x).toBeCloseTo(-0.5);
+    expect(positions[0].y).toBeCloseTo(-1);
+
+    expect(positions[1].x).toBeCloseTo(0.5);
+    expect(positions[1].y).toBeCloseTo(-1);
+
+    expect(positions[2].x).toBeCloseTo(-0.5);
+    expect(positions[2].y).toBeCloseTo(1);
+
+    expect(positions[3].x).toBeCloseTo(0.5);
+    expect(positions[3].y).toBeCloseTo(1);
+  });
+
+  it("set texture fill should be success", () => {
+    scene.background.textureFillMode = BackgroundTextureFillMode.AspectFitWidth;
+    const positions = engine._backgroundTextureMesh.getPositions();
+    expect(positions[0].x).toBeCloseTo(-1);
+    expect(positions[0].y).toBeCloseTo(-2);
+
+    expect(positions[1].x).toBeCloseTo(1);
+    expect(positions[1].y).toBeCloseTo(-2);
+
+    expect(positions[2].x).toBeCloseTo(-1);
+    expect(positions[2].y).toBeCloseTo(2);
+
+    expect(positions[3].x).toBeCloseTo(1);
+    expect(positions[3].y).toBeCloseTo(2);
+  });
+});