import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

devtools/client/debugger/test/mochitest/browser_dbg_parser-01.js

@@ -0,0 +1,33 @@
+/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
+/* vim: set ft=javascript ts=2 et sw=2 tw=80: */
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/ */
+
+/**
+ * Check that simple JS can be parsed and cached with the reflection API.
+ */
+
+function test() {
+  let { Parser } = Cu.import("resource://devtools/shared/Parser.jsm", {});
+
+  let source = "let x = 42;";
+  let parser = new Parser();
+  let first = parser.get(source);
+  let second = parser.get(source);
+
+  isnot(first, second,
+    "The two syntax trees should be different.");
+
+  let third = parser.get(source, "url");
+  let fourth = parser.get(source, "url");
+
+  isnot(first, third,
+    "The new syntax trees should be different than the old ones.");
+  is(third, fourth,
+    "The new syntax trees were cached once an identifier was specified.");
+
+  is(parser.errors.length, 0,
+    "There should be no errors logged when parsing.");
+
+  finish();
+}