refactor(test-functional): rewrite test

test/functional/misc/misc_instancing.js

@@ -1,35 +1,35 @@
 const assert = require('assert');
 
 describe('misc_instancing', function _() {
-    let result;
-    before(async () => {
-        result = await loadExample(
-            'examples/misc_instancing.html',
-            this.fullTitle(),
-        );
-    });
+    let pageLoaded;
+    const title = this.fullTitle();
 
-    it('should run', async () => {
-        assert.ok(result);
+    it("should load 'misc_instancing' page", async function _it() {
+        pageLoaded = await loadExample('examples/misc_instancing.html', title);
+        assert.ok(pageLoaded);
     });
 
-    it('should load the trees and lights objects', async () => {
-        const objects = await page.evaluate(
-            () => {
-                const res = [];
-                if (view.scene) {
-                    const objects3d = view.scene;
-                    objects3d.traverse((obj) => {
-                        if (obj.isInstancedMesh) {
-                            if (obj.parent && obj.parent.layer) {
-                                res.push(obj.parent.layer.name);
+    it('should load the trees and lights objects', async function _it() {
+        if (pageLoaded) {
+            const objects = await page.evaluate(
+                () => {
+                    const res = [];
+                    if (view.scene) {
+                        const objects3d = view.scene;
+                        objects3d.traverse((obj) => {
+                            if (obj.isInstancedMesh) {
+                                if (obj.parent && obj.parent.layer) {
+                                    res.push(obj.parent.layer.name);
+                                }
                             }
-                        }
-                    });
-                }
-                return res;
-            });
-        assert.ok(objects.indexOf('lights') >= 0);
-        assert.ok(objects.indexOf('trees') >= 0);
+                        });
+                    }
+                    return res;
+                });
+            assert.ok(objects.indexOf('lights') >= 0);
+            assert.ok(objects.indexOf('trees') >= 0);
+        } else {
+            this.skip();
+        }
     });
 });