The register method should return existing modules

.editorconfig

@@ -0,0 +1,13 @@
+# http://editorconfig.org
+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.md]
+trim_trailing_whitespace = false

.gitignore

@@ -1,3 +1,4 @@
 /node_modules/
 npm-debug.log
 /coverage/
+.idea/

lib/registry.js

@@ -35,7 +35,7 @@ var Registry = module.exports = {
 
   register: function(module) {
     if (this.data[module]) {
-      return;
+      return this.data[module].module;
     }
 
     var pkg;

spec/lib/registry.spec.js

@@ -34,5 +34,22 @@ describe("Registry", function() {
         }
       });
     });
+
+    context("when the module already exists", function() {
+      it("returns the module", function() {
+        expect(Registry.data).to.be.eql({});
+
+        var result = Registry.register(path);
+
+        // should register the module and return it
+        expect(result).to.be.eql(mod);
+
+        result = Registry.register(path);
+
+        // should just return the existing module
+        expect(result).to.be.eql(mod);
+
+      });
+    });
   });
 });