Add unit tests for require() handler

lib/handlebars.js

@@ -21,15 +21,15 @@ Handlebars.create = create;
 
 module.exports = Handlebars; // instantiate an instance
 
-// Publish a Node.js require() handler for handlebars files
-if ((typeof(require) !== "undefined") && require.extensions) {
-    var extension = function(module, filename) {
-        var fs = require("fs");
-        var templateString = fs.readFileSync(filename, 'utf8');
-        module.exports = Handlebars.compile(templateString);
-    };
-    require.extensions[".handlebars"] = extension;
-    require.extensions[".hbs"] = extension;
+// Publish a Node.js require() handler for .handlebars and .hbs files
+if (require.extensions) {
+  var extension = function(module, filename) {
+    var fs = require("fs");
+    var templateString = fs.readFileSync(filename, "utf8");
+    module.exports = Handlebars.compile(templateString);
+  };
+  require.extensions[".handlebars"] = extension;
+  require.extensions[".hbs"] = extension;
 }
 
 // BEGIN(BROWSER)

spec/example_1.handlebars

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

spec/example_2.hbs

@@ -0,0 +1 @@
+Hello, {{name}}!

spec/qunit_spec.js

@@ -1475,6 +1475,26 @@ test('GH-375: Unicode line terminators', function() {
   shouldCompileTo('\u2028', {}, '\u2028');
 });
 
+test('Load .handlebars files with require()', function() {
+  var template = require("./example_1");
+  assert.deepEqual(template, require("./example_1.handlebars"));
+
+  var expected = 'foo\n';
+  var result = template({foo: "foo"});
+
+  equal(result, expected);
+});
+
+test('Load .hbs files with require()', function() {
+  var template = require("./example_2");
+  assert.deepEqual(template, require("./example_2.hbs"));
+
+  var expected = 'Hello, World!\n';
+  var result = template({name: "World"});
+
+  equal(result, expected);
+});
+
 suite('Utils');
 
 test('escapeExpression', function() {