Add tests for add-comments option

test/inputs/arbitrary_comments.js

@@ -0,0 +1,7 @@
+// I am a normal comment
+// comment: I am an extracted comment
+var msg = gettext('Hello World');  // comment: I am a comment on the same line
+// comment: I belong to dup
+var dup = gettext('Hello translators');  // I am an ordinary, inline code comment
+/// I'm a standards compliant extracted comment!
+var tis = gettext('Hello everyone');  ///I am an inline triple-slash comment

test/outputs/arbitrary_comments.pot

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+#: inputs/arbitrary_comments.js:3
+#. I am an extracted comment
+#. I am a comment on the same line
+msgid "Hello World"
+msgstr ""
+
+#: inputs/arbitrary_comments.js:5
+#. I belong to dup
+msgid "Hello translators"
+msgstr ""
+
+#: inputs/arbitrary_comments.js:7
+#. I'm a standards compliant extracted comment!
+#. I am an inline triple-slash comment
+msgid "Hello everyone"
+msgstr ""

test/tests/arbitrary_comments.js

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+"use strict";
+
+var fs = require('fs');
+var path = require('path');
+
+var jsxgettext = require('../../lib/jsxgettext');
+var utils = require('../utils');
+
+exports['test --add-comments option'] = function (assert, cb) {
+  var inputFilename = path.join(__dirname, '..', 'inputs', 'arbitrary_comments.js');
+  fs.readFile(inputFilename, 'utf8', function (err, source) {
+    var options = {"add-comments": "comment:"};
+    var result = jsxgettext.generate({'inputs/arbitrary_comments.js': source}, options);
+
+    assert.equal(typeof result, 'string', 'Result should be a string');
+    assert.ok(result.length > 0, 'Result should not be empty');
+
+    var outputFilename = path.join(__dirname, '..', 'outputs', 'arbitrary_comments.pot');
+    utils.compareResultWithFile(result, outputFilename, assert, cb);
+  });
+};
+
+if (module === require.main) require('test').run(exports);