Redeclare process/global as strings

spec/fixtures/module/declare-global.js

@@ -1,2 +1,2 @@
-const global = {__global: true}
+const global = 'declared global'
 module.exports = global

spec/fixtures/module/declare-process.js

@@ -1,2 +1,2 @@
-const process = require('process')
+const process = 'declared process'
 module.exports = process

spec/modules-spec.js

@@ -51,13 +51,13 @@ describe('third-party module', function () {
   describe('global variables', function () {
     describe('process', function () {
       it('can be declared in a module', function () {
-        assert.strictEqual(require('./fixtures/module/declare-process'), require('process'))
+        assert.strictEqual(require('./fixtures/module/declare-process'), 'declared process')
       })
     })
 
     describe('global', function () {
       it('can be declared in a module', function () {
-        assert.deepEqual(require('./fixtures/module/declare-global'), {__global: true})
+        assert.deepEqual(require('./fixtures/module/declare-global'), 'declared global')
       })
     })
   })