Add test that every source file has a test.

test/_spec.js

@@ -0,0 +1,79 @@
+/**
+ * Copyright 2014 IBM Corp.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ **/
+
+/**
+ * This test simply checks that for every .js file there exists
+ * a *_spec.js file under ./test correspondingly.
+ */
+
+/**
+ * Currently we're only checking the core components under ./red
+ * TODO: Increase the scope of this check
+ */
+
+var fs = require("fs");
+var should = require("should");
+
+var core = "/../red";
+
+/*
+ * Walk directory and find all .js files. Then check if a corresponding
+ * ./test/*_spec.js file exists.
+ */
+function walkDirectory(directory, done) {
+    fs.readdir(directory, function(err, list) {
+        if (err) {
+            return done(err);
+        }
+        var i = 0;
+        function nextEntry() {
+            var file = list[i++];
+            if (!file) {
+                return;
+            }
+            file = directory + '/' + file;
+            fs.stat(file, function(err, stat) {
+                if (stat && stat.isDirectory()) {
+                    walkDirectory(file, function(err, res) {
+                        nextEntry();
+                    });
+                } else {
+                    if (/\.js$/.test(file)) {
+                        file = file.replace("/../", "/");
+                        file = file.replace(".js", "_spec.js");
+                        fs.exists(file, function(exists) {
+                            try {
+                                exists.should.equal(true, file + " does not exist");   
+                            } catch (err) {
+                                done(err);
+                            }
+                        });
+                    }
+                    nextEntry();
+                }
+            });
+        }
+        nextEntry();
+    });
+}
+
+describe('_spec.js', function() {
+    this.timeout(50000); // we might not finish within the Mocha default timeout limit, project will also grow
+    it('is checking if all .js files have a corresponding _spec.js test file.', function(done) {
+        walkDirectory(__dirname + core, done);
+        done();
+    });
+});