Add test for crate filtering

Author: GuillaumeGomez

src/test/rustdoc-js/filter-crate.js

@@ -0,0 +1,20 @@
+// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// should-fail
+
+const QUERY = 'string';
+const FILTER_CRATE = 'core';
+
+const EXPECTED = {
+    'others': [
+        { 'path': 'std::collections', 'name': 'VecDeque' },
+    ],
+};

src/tools/rustdoc-js/tester.js

@@ -259,6 +259,7 @@ function main(argv) {
                                'exports.QUERY = QUERY;exports.EXPECTED = EXPECTED;');
         const expected = loadedFile.EXPECTED;
         const query = loadedFile.QUERY;
+        const filter_crate = loadedFile.FILTER_CRATE;
         const ignore_order = loadedFile.ignore_order;
         const exact_check = loadedFile.exact_check;
         const should_fail = loadedFile.should_fail;