test: invalid package.json causes error when require()ing in directory

Requiring a file from a directory that contains an invalid package.json
file should throw an error.

PR-URL: https://github.com/nodejs/node/pull/10044
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

test/fixtures/packages/invalid/index.js

@@ -0,0 +1 @@
+exports.ok = 'ok';

test/fixtures/packages/invalid/package.json

@@ -0,0 +1 @@
+{,}

test/sequential/test-module-loading.js

@@ -69,6 +69,13 @@ assert.strictEqual(threeFolder, threeIndex);
 assert.notStrictEqual(threeFolder, three);
 
 console.error('test package.json require() loading');
+assert.throws(
+  function() {
+    require('../fixtures/packages/invalid');
+  },
+  /^SyntaxError: Error parsing \S+: Unexpected token , in JSON at position 1$/
+);
+
 assert.strictEqual(require('../fixtures/packages/index').ok, 'ok',
                    'Failed loading package');
 assert.strictEqual(require('../fixtures/packages/main').ok, 'ok',