Index: node_modules/node-gyp/test/test-options.js
===================================================================
--- node_modules/node-gyp/test/test-options.js	(revision 81bc7da776d8cda42939ef4ab350c88d13b4941f)
+++ node_modules/node-gyp/test/test-options.js	(revision 81bc7da776d8cda42939ef4ab350c88d13b4941f)
@@ -0,0 +1,31 @@
+'use strict'
+
+const test = require('tap').test
+const gyp = require('../lib/node-gyp')
+
+test('options in environment', (t) => {
+  t.plan(1)
+
+  // `npm test` dumps a ton of npm_config_* variables in the environment.
+  Object.keys(process.env)
+    .filter((key) => /^npm_config_/.test(key))
+    .forEach((key) => { delete process.env[key] })
+
+  // in some platforms, certain keys are stubborn and cannot be removed
+  const keys = Object.keys(process.env)
+    .filter((key) => /^npm_config_/.test(key))
+    .map((key) => key.substring('npm_config_'.length))
+    .concat('argv', 'x')
+
+  // Zero-length keys should get filtered out.
+  process.env.npm_config_ = '42'
+  // Other keys should get added.
+  process.env.npm_config_x = '42'
+  // Except loglevel.
+  process.env.npm_config_loglevel = 'debug'
+
+  const g = gyp()
+  g.parseArgv(['rebuild']) // Also sets opts.argv.
+
+  t.deepEqual(Object.keys(g.opts).sort(), keys.sort())
+})