User should not be allowed to post both 'strategy' and 'strategies' at the same time

Relates #102

packages/unleash-api/lib/routes/feature.js

@@ -32,6 +32,7 @@ module.exports = function (app, config) {
         req.checkBody('name', 'Name must match format ^[0-9a-zA-Z\\.\\-]+$').matches(/^[0-9a-zA-Z\\.\\-]+$/i);
 
         validateRequest(req)
+            .then(validateFormat)
             .then(validateUniqueName)
             .then(() => eventStore.create({
                 type: eventType.featureCreated,
@@ -102,4 +103,12 @@ module.exports = function (app, config) {
                 });
         });
     }
+
+    function validateFormat (req) {
+        if (req.body.strategy && req.body.strategies) {
+            return BPromise.reject(new ValidationError('Cannot use both "strategy" and "strategies".'));
+        }
+
+        return BPromise.resolve(req);
+    }
 };

packages/unleash-api/test/featureApiSpec.js

@@ -141,5 +141,25 @@ describe('The features api', () => {
                 .set('Content-Type', 'application/json')
                 .expect(200, done);
         });
+
+        it('should not be allowed to post both strategy and strategies', function (done) {
+            logger.setLevel('FATAL');
+            request
+                .post('/features')
+                .send({
+                    name: 'featureConfusing',
+                    description: 'soon to be the #14 feature',
+                    enabled: false,
+                    strategy: 'baz',
+                    parameters: {},
+                    strategies: [
+                        {
+                            name: 'baz',
+                            parameters: { foo: 'bar' },
+                        },
+                    ] })
+                .set('Content-Type', 'application/json')
+                .expect(400, done);
+        });
     });
 });