Add tests for enableWASM() (#3835)

platform/npm/test.js

@@ -33,6 +33,7 @@ import { promisify } from 'util';
 
 async function spawnMocha() {
     const files = [
+        'tests/wasm.js',
         'tests/snfe.js',
     ];
 

platform/npm/tests/wasm.js

@@ -0,0 +1,51 @@
+/*******************************************************************************
+
+    uBlock Origin - a browser extension to block requests.
+    Copyright (C) 2014-present Raymond Hill
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see {http://www.gnu.org/licenses/}.
+
+    Home: https://github.com/gorhill/uBlock
+*/
+
+'use strict';
+
+/******************************************************************************/
+
+import { strict as assert } from 'assert';
+
+import { createWorld } from 'esm-world';
+
+import './_common.js';
+
+describe('WASM', () => {
+    context('WebAssembly available', () => {
+        it('should fulfill with true', async () => {
+            const { enableWASM } = await createWorld('./index.js', { globals: { URL, WebAssembly } });
+
+            assert.equal(await enableWASM(), true);
+        });
+    });
+
+    context('WebAssembly not available', () => {
+        it('should fulfill with false', async () => {
+            // WebAssembly must be set to undefined explicitly; otherwise
+            // createWorld() ends up using the global WebAssembly object
+            // anyway.
+            const { enableWASM } = await createWorld('./index.js', { globals: { URL, WebAssembly: undefined } });
+
+            assert.equal(await enableWASM(), false);
+        });
+    });
+});