Saner manifest handling.

Controllers and tests are coerced into an object/array on parse instead of on demand.
Removed unnecessary function.

js/server/modules/org/arangodb/foxx/manager.js

@@ -144,16 +144,23 @@ var manifestSchema = {
     })
   ),
   scripts: (
-    joi.object()
+    joi.object().optional()
     .pattern(RE_EMPTY, joi.forbidden())
     .pattern(RE_NOT_EMPTY, joi.string().required())
-    .default(function () {return {};}, 'empty scripts object')
+    .default(Object, 'empty scripts object')
   ),
   setup: joi.string().optional(), // TODO remove in 2.8
   teardown: joi.string().optional(), // TODO remove in 2.8
   tests: (
+    joi.alternatives()
+    .try(
+      joi.string().required(),
+      (
         joi.array().optional()
         .items(joi.string().required())
+        .default(Array, 'empty test files array')
+      )
+    )
   ),
   thumbnail: joi.string().optional(),
   version: joi.string().required(),
@@ -352,6 +359,14 @@ var checkManifest = function(filename, manifest) {
     }
   });
 
+  if (typeof manifest.controllers === 'string') {
+    manifest.controllers = {'/': manifest.controllers};
+  }
+
+  if (typeof manifest.tests === 'string') {
+    manifest.tests = [manifest.tests];
+  }
+
   if (!valid) {
     throw new ArangoError({
       errorNum: errors.ERROR_INVALID_APPLICATION_MANIFEST.code,

js/server/modules/org/arangodb/foxx/routing.js

@@ -634,9 +634,7 @@ function escapeHTML (string) {
     var controllers = app._manifest.controllers;
 
     try {
-      if (typeof controllers === "string") {
-        mountController(app, routes, "/", controllers);
-      } else if (controllers) {
+      if (controllers) {
         Object.keys(controllers).forEach(function (key) {
           mountController(app, routes, key, controllers[key]);
         });