add some real world examples for c-strings in po files

make sure, if a file containing c-string messages is identical after being
parsed and written afterwards.

test/fixtures/c-strings.po

@@ -0,0 +1,19 @@
+# French translation of Link (6.x-2.9)
+# Copyright (c) 2011 by the French translation team
+msgid ""
+msgstr ""
+"Project-Id-Version: Link (6.x-2.9)\n"
+"Report-Msgid-Bugs-To: \n"
+"POT-Creation-Date: 2011-12-31 23:39+0000\n"
+"PO-Revision-Date: 2013-12-17 14:59+0100\n"
+"Last-Translator: Ruben Vermeersch <ruben@rocketeer.be>\n"
+"Language: fr\n"
+"Language-Team: French\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"Plural-Forms: nplurals=2; plural=(n > 1);\n"
+"MIME-Version: 1.0\n"
+"X-Generator: Poedit 1.6.2\n"
+
+msgid "The name field must not contain characters like \" or \\"
+msgstr ""

test/parse.js

@@ -84,4 +84,21 @@ describe('Parse', function () {
         assert.equal(ambiguousItems[0].msgctxt, 'folder display');
         assert.equal(ambiguousItems[1].msgctxt, 'folder action');
     });
+
+    describe('C-Strings', function () {
+        it('should parse the c-strings.po file', function () {
+            var po = PO.parse(fs.readFileSync(__dirname + '/fixtures/c-strings.po', 'utf8'));
+
+            assert.notEqual(po, null);
+        });
+
+        it('should extract strings containing " and \\ characters', function () {
+            var po = PO.parse(fs.readFileSync(__dirname + '/fixtures/c-strings.po', 'utf8'));
+
+            var items = po.items.filter(function (item) {
+                return (/^The name field must not contain/).test(item.msgid);
+            });
+            assert.equal(items[0].msgid, 'The name field must not contain characters like " or \\');
+        });
+    });
 });

test/write.js

@@ -66,6 +66,14 @@ describe('Write', function () {
             item.msgid = '\\ should be written escaped';
             assertHasLine(item.toString(), 'msgid "\\\\ should be written escaped"');
         });
+
+        it('should write identical file after parsing a file', function () {
+            var input = fs.readFileSync(__dirname + '/fixtures/c-strings.po', 'utf8');
+            var po = PO.parse(input);
+            var str = po.toString();
+
+            assert.equal(str, input);
+        });
     });
 
     describe('msgctxt', function () {