Added a test for the imagePath option. The image-url() function should prepend a…

Added a test for the imagePath option. The image-url() function should prepend a user-configurable image path.

test/image_path.scss

+body {
+	background-image: image-url('image.png');
+}

test/test.js

@@ -133,6 +133,21 @@ describe("compile file with include paths", function(){
   });
 });
 
+describe("compile file with image path", function(){
+  it("should compile with render", function(done) {
+    sass.render({
+      file: path.resolve(__dirname, "image_path.scss"),
+      imagePath: '/path/to/images',
+      success: function (css) {
+        done(assert.equal(css, "body {\n  background-image: url(\"/path/to/images/image.png\"); }\n"));
+      },
+      error: function (error) {
+        done(error);
+      }
+    });
+  });
+});
+
 describe("compile file", function() {
   it("should compile with render", function(done) {
     sass.render({