Babylon.js/tests/unit/babylon/src/Meshes/babylon.mesh.vertexData.tests.ts

/**
 * Describes the test suite.
 */
describe('Babylon Mesh Vertex Data', () => {
    /**
     * Loads the dependencies.
     */
    before(function(done) {
        this.timeout(180000);
        (BABYLONDEVTOOLS).Loader
            .useDist()
            .testMode()
            .load(function() {
                // Force apply promise polyfill for consistent behavior between chrome headless, IE11, and other browsers.
                BABYLON.PromisePolyfill.Apply(true);
                done();
            });
    });

    describe('#Mesh Vertex Data Merge', () => {
        it('should be able to merge data', () => {
            const foo = new BABYLON.VertexData();
            foo.positions = [0, 0, 0];
            foo.normals = [0, 0, 1];

            const bar = new BABYLON.VertexData();
            bar.positions = [0, 0, 1];
            bar.normals = [0, 1, 0];

            const merged = foo.merge(bar);
            expect(merged.positions).to.eql([0, 0, 0, 0, 0, 1]);
            expect(merged.normals).to.eql([0, 0, 1, 0, 1, 0]);
        });

        it('should not be able to merge data that are not valid', () => {
            const foo = new BABYLON.VertexData();
            foo.positions = [0, 0, 0];
            foo.normals = [0];

            const bar = new BABYLON.VertexData();
            bar.positions = [0, 0, 1];
            bar.normals = [0];

            expect(() => {
                foo.merge(bar);
            }).to.throw(Error);
        });

        it('should not be able to merge data with different attributes', () => {
            const foo = new BABYLON.VertexData();
            foo.positions = [0, 0, 0];
            foo.normals = [0, 0, 1];

            const bar = new BABYLON.VertexData();
            bar.positions = [0, 0, 1];

            expect(() => {
                foo.merge(bar);
            }).to.throw(Error);
        });
    });
});