text: /* global QUnit */
  
  import * as BufferGeometryUtils from '../../../../examples/jsm/utils/BufferGeometryUtils.js';
  
  import { BufferAttribute } from '../../../../src/core/BufferAttribute.js';
  import { BufferGeometry } from '../../../../src/core/BufferGeometry.js';
  import { TriangleStripDrawMode, TriangleFanDrawMode } from '../../../../src/constants.js';
  
  export default QUnit.module( 'Utils', () => {
  
  	QUnit.module( 'BufferGeometryUtils', () => {
  
  		QUnit.test( 'mergeBufferAttributes - basic', ( assert ) => {
  
  			var array1 = new Float32Array( [ 1, 2, 3, 4 ] );
  			var attr1 = new BufferAttribute( array1, 2, false );
  
  			var array2 = new Float32Array( [ 5, 6, 7, 8 ] );
  			var attr2 = new BufferAttribute( array2, 2, false );
  
  			var mergedAttr = BufferGeometryUtils.mergeBufferAttributes( [ attr1, attr2 ] );
  
  			assert.smartEqual( Array.from( mergedAttr.array ), [ 1, 2, 3, 4, 5, 6, 7, 8 ], 'merges elements' );
  			assert.equal( mergedAttr.itemSize, 2, 'retains .itemSize' );
  			assert.equal( mergedAttr.normalized, false, 'retains .normalized' );
  
  		} );
  
  		QUnit.test( 'mergeBufferAttributes - invalid', ( assert ) => {
  
  			var array1 = new Float32Array( [ 1, 2, 3, 4 ] );
  			var attr1 = new BufferAttribute( array1, 2, false );
  
  			var array2 = new Float32Array( [ 5, 6, 7, 8 ] );
  			var attr2 = new BufferAttribute( array2, 4, false );
  
  			assert.notOk( BufferGeometryUtils.mergeBufferAttributes( [ attr1, attr2 ] ) );
  
  			attr2.itemSize = 2;
  			attr2.normalized = true;
  
  			assert.notOk( BufferGeometryUtils.mergeBufferAttributes( [ attr1, attr2 ] ) );
  
  			attr2.normalized = false;
  
  			assert.ok( BufferGeometryUtils.mergeBufferAttributes( [ attr1, attr2 ] ) );
  
  		} );
  
  		QUnit.test( 'mergeBufferGeometries - basic', ( assert ) => {
  
  			var geometry1 = new BufferGeometry();
  			geometry1.setAttribute( 'position', new BufferAttribute( new Float32Array( [ 1, 2, 3 ] ), 1, false ) );
  
  			var geometry2 = new BufferGeometry();
  			geometry2.setAttribute( 'position', new BufferAttribute( new Float32Array( [ 4, 5, 6 ] ), 1, false ) );
  
  			var mergedGeometry = BufferGeometryUtils.mergeBufferGeometries( [ geometry1, geometry2 ] );
  
  			assert.ok( mergedGeometry, 'merge succeeds' );
  			assert.smartEqual( Array.from( mergedGeometry.attributes.position.array ), [ 1, 2, 3, 4, 5, 6 ], 'merges elements' );
  			assert.equal( mergedGeometry.attributes.position.itemSize, 1, 'retains .itemSize' );
  
  		} );
  
  		QUnit.test( 'mergeBufferGeometries - indexed', ( assert ) => {
  
  			var geometry1 = new BufferGeometry();
  			geometry1.setAttribute( 'position', new BufferAttribute( new Float32Array( [ 1, 2, 3 ] ), 1, false ) );
  			geometry1.setIndex( new BufferAttribute( new Uint16Array( [ 0, 1, 2, 2, 1, 0 ] ), 1, false ) );
  
  			var geometry2 = new BufferGeometry();
  			geometry2.setAttribute( 'position', new BufferAttribute( new Float32Array( [ 4, 5, 6 ] ), 1, false ) );
  			geometry2.setIndex( new BufferAttribute( new Uint16Array( [ 0, 1, 2 ] ), 1, false ) );
  
  			var mergedGeometry = BufferGeometryUtils.mergeBufferGeometries( [ geometry1, geometry2 ] );
  
  			assert.ok( mergedGeometry, 'merge succeeds' );
  			assert.smartEqual( Array.from( mergedGeometry.attributes.position.array ), [ 1, 2, 3, 4, 5, 6 ], 'merges elements' );
  			assert.smartEqual( Array.from( mergedGeometry.index.array ), [ 0, 1, 2, 2, 1, 0, 3, 4, 5 ], 'merges indices' );
  			assert.equal( mergedGeometry.attributes.position.itemSize, 1, 'retains .itemSize' );
  
  		} );
  
  		QUnit.test( 'mergeBufferGeometries - morph targets', ( assert ) => {
  
  			var geometry1 = new BufferGeometry();
  			geometry1.setAttribute( 'position', new BufferAttribute( new Float32Array( [ 1, 2, 3 ] ), 1, false ) );
  			geometry1.morphAttributes.position = [
  				new BufferAttribute( new Float32Array( [ 10, 20, 30 ] ), 1, false ),
  				new BufferAttribute( new Float32Array( [ 100, 200, 300 ] ), 1, false )
  			];
  
  			var geometry2 = new BufferGeometry();
  			geometry2.setAttribute( 'position', new BufferAttribute( new Float32Array( [ 4, 5, 6 ] ), 1, false ) );
  			geometry2.morphAttributes.position = [
  				new BufferAttribute( new Float32Array( [ 40, 50, 60 ] ), 1, false ),
  				new BufferAttribute( new Float32Array( [ 400, 500, 600 ] ), 1, false )
  			];
  
  			var mergedGeometry = BufferGeometryUtils.mergeBufferGeometries( [ geometry1, geometry2 ] );
  
  			assert.ok( mergedGeometry, 'merge succeeds' );
  			assert.smartEqual( Array.from( mergedGeometry.attributes.position.array ), [ 1, 2, 3, 4, 5, 6 ], 'merges elements' );
  			assert.smartEqual( Array.from( mergedGeometry.morphAttributes.position[ 0 ].array ), [ 10, 20, 30, 40, 50, 60 ], 'merges morph targets' );
  			assert.smartEqual( Array.from( mergedGeometry.morphAttributes.position[ 1 ].array ), [ 100, 200, 300, 400, 500, 600 ], 'merges morph targets' );
  			assert.equal( mergedGeometry.attributes.position.itemSize, 1, 'retains .itemSize' );
  
  		} );
  
  		QUnit.test( 'mergeBufferGeometries - invalid', ( assert ) => {
  
  			var geometry1 = new BufferGeometry();
  			geometry1.setAttribute( 'position', new BufferAttribute( new Float32Array( [ 1, 2, 3 ] ), 1, false ) );
  			geometry1.setIndex( new BufferAttribute( new Uint16Array( [ 0, 1, 2 ] ), 1, false ) );
  
  			var geometry2 = new BufferGeometry();
  			geometry2.setAttribute( 'position', new BufferAttribute( new Float32Array( [ 4, 5, 6 ] ), 1, false ) );
  
  			assert.notOk( BufferGeometryUtils.mergeBufferGeometries( [ geometry1, geometry2 ] ) );
  
  			geometry2.setIndex( new BufferAttribute( new Uint16Array( [ 0, 1, 2 ] ), 1, false ) );
  
  			assert.ok( BufferGeometryUtils.mergeBufferGeometries( [ geometry1, geometry2 ] ) );
  
  			geometry2.setAttribute( 'foo', new BufferAttribute( new Float32Array( [ 1, 2, 3 ] ), 1, false ) );
  
  			assert.notOk( BufferGeometryUtils.mergeBufferGeometries( [ geometry1, geometry2 ] ) );
  
  		} );
  
  		QUnit.test( 'toTrianglesDrawMode()', ( assert ) => {
  
  			// TRIANGLE_STRIP
  
  			const vertices1 = [];
  
  			vertices1.push( 0, 0, 0 ); // v0
  			vertices1.push( 1, 0, 0 ); // v1
  			vertices1.push( 0, 1, 0 ); // v2
  			vertices1.push( 2, 0, 0 ); // v3
  			vertices1.push( 2, 1, 0 ); // v4
  			vertices1.push( 3, 0, 0 ); // v5
  
  			var geometry1 = new BufferGeometry();
  
  			geometry1.setAttribute( 'position', new BufferAttribute( new Float32Array( vertices1 ), 3 ) );
  			geometry1 = BufferGeometryUtils.toTrianglesDrawMode( geometry1, TriangleStripDrawMode );
  
  			assert.deepEqual( geometry1.index.array, new Uint16Array( [ 0, 1, 2, 3, 2, 1, 2, 3, 4, 5, 4, 3 ] ), 'correct triangle indices from triangle strip' );
  
  			// TRIANGLE_FAN
  
  			const vertices2 = [];
  
  			vertices2.push( 0, 0, 0 ); // v0
  			vertices2.push( 1, 0, 0 ); // v1
  			vertices2.push( 1, 1, 0 ); // v2
  			vertices2.push( 0, 1, 0 ); // v3
  			vertices2.push( - 1, 1, 0 ); // v4
  			vertices2.push( - 1, 0, 0 ); // v5
  
  			var geometry2 = new BufferGeometry();
  
  			geometry2.setAttribute( 'position', new BufferAttribute( new Float32Array( vertices2 ), 3 ) );
  			geometry2 = BufferGeometryUtils.toTrianglesDrawMode( geometry2, TriangleFanDrawMode );
  
  			assert.deepEqual( geometry2.index.array, new Uint16Array( [ 0, 1, 2, 0, 2, 3, 0, 3, 4, 0, 4, 5 ] ), 'correct triangle indices from triangle fan' );
  
  		} );
  
  	} );
  
  } );
  