app.respond: support 205 status codes as no-content

pretty new to me, but it’s basically the same as 204

lib/application.js

@@ -180,7 +180,7 @@ function *respond(next){
   var res = this.res;
   var body = this.body;
   var head = 'HEAD' == this.method;
-  var noContent = 204 == this.status || 304 == this.status;
+  var noContent = ~[204, 205, 304].indexOf(this.status);
 
   // 404
   if (null == body && 200 == this.status) {

test/application.js

@@ -104,6 +104,7 @@ describe('app.respond', function(){
   })
 
   describe('when .body is missing', function(){
+    describe('with status=400', function(){
       it('should respond with the associated status message', function(done){
         var app = koa();
 
@@ -120,6 +121,93 @@ describe('app.respond', function(){
       })
     })
 
+    describe('with status=200', function(){
+      it('should respond with a 404', function(done){
+        var app = koa();
+
+        app.use(function *(){
+          this.status = 200;
+        })
+
+        var server = app.listen();
+
+        request(server)
+        .get('/')
+        .expect(404)
+        .expect('Not Found', done);
+      })
+    })
+
+    describe('with status=204', function(){
+      it('should respond without a body', function(done){
+        var app = koa();
+
+        app.use(function *(){
+          this.status = 204;
+        })
+
+        var server = app.listen();
+
+        request(server)
+        .get('/')
+        .expect(204)
+        .expect('')
+        .end(function (err, res) {
+          if (err) return done(err);
+
+          res.header.should.not.have.property('content-type');
+          done();
+        })
+      })
+    })
+
+    describe('with status=205', function(){
+      it('should respond without a body', function(done){
+        var app = koa();
+
+        app.use(function *(){
+          this.status = 205;
+        })
+
+        var server = app.listen();
+
+        request(server)
+        .get('/')
+        .expect(205)
+        .expect('')
+        .end(function (err, res) {
+          if (err) return done(err);
+
+          res.header.should.not.have.property('content-type');
+          done();
+        })
+      })
+    })
+
+    describe('with status=304', function(){
+      it('should respond without a body', function(done){
+        var app = koa();
+
+        app.use(function *(){
+          this.status = 304;
+        })
+
+        var server = app.listen();
+
+        request(server)
+        .get('/')
+        .expect(304)
+        .expect('')
+        .end(function (err, res) {
+          if (err) return done(err);
+
+          res.header.should.not.have.property('content-type');
+          done();
+        })
+      })
+    })
+  })
+
   describe('when .body is a string', function(){
     it('should respond', function(done){
       var app = koa();