<NME> testing.ts
<BEF> /**
 * @license
 * Copyright 2016 Google Inc.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import {GL, initializeWebGL} from 'neuroglancer/webgl/context';

export function webglTest(f: (gl: GL, canvas: HTMLCanvasElement) => void) {
  let canvas = document.createElement('canvas');
  document.body.appendChild(canvas);
  let gl: GL|undefined;
  try {
    gl = initializeWebGL(canvas);
    f(gl, canvas);
  } finally {
    if (gl != null) {
      const loseContext = gl.getExtension('WEBGL_lose_context');
      if (loseContext !== null) {
        loseContext.loseContext();
      }
    }
    document.body.removeChild(canvas);
  }
}

<MSG> tests: add option to skip WebGL tests

This allows the other tests to run successfully on browsers on Github Actions test runners that do
not have a working WebGL implementation.

<DFF> @@ -16,7 +16,14 @@
 
 import {GL, initializeWebGL} from 'neuroglancer/webgl/context';
 
+declare const NEUROGLANCER_SKIP_WEBGL_TESTS: boolean|undefined;
+
 export function webglTest(f: (gl: GL, canvas: HTMLCanvasElement) => void) {
+  if (typeof NEUROGLANCER_SKIP_WEBGL_TESTS !== 'undefined' &&
+      NEUROGLANCER_SKIP_WEBGL_TESTS === true) {
+    pending('NEUROGLANCER_SKIP_WEBGL_TESTS=true');
+    return;
+  }
   let canvas = document.createElement('canvas');
   document.body.appendChild(canvas);
   let gl: GL|undefined;

tests: add option to skip WebGL tests