Revert "remove framebuffer test: marginal value"

This reverts commit 6bd3c74.

Author: johanrd

src/gl/framebuffer.test.ts

@@ -0,0 +1,22 @@
+import {describe, test, expect, vi} from 'vitest';
+import {Context} from './context';
+import {Framebuffer} from './framebuffer';
+
+describe('Framebuffer', () => {
+    test('constructor does not check framebuffer status before attachments are set', () => {
+        const gl = document.createElement('canvas').getContext('webgl');
+        vi.spyOn(gl, 'checkFramebufferStatus').mockReturnValue(0);
+        const context = new Context(gl);
+
+        expect(() => new Framebuffer(context, 256, 256, false, false)).not.toThrow();
+    });
+
+    test('checkFramebufferStatus throws when framebuffer is incomplete', () => {
+        const gl = document.createElement('canvas').getContext('webgl');
+        vi.spyOn(gl, 'checkFramebufferStatus').mockReturnValue(0);
+        const context = new Context(gl);
+        const fbo = new Framebuffer(context, 256, 256, false, false);
+
+        expect(() => fbo.checkFramebufferStatus()).toThrow('Framebuffer is not complete');
+    });
+});