test: imporve coverage to 100%

lib/application.js

@@ -59,6 +59,8 @@ module.exports = class Application extends Emitter {
     this.context = Object.create(context);
     this.request = Object.create(request);
     this.response = Object.create(response);
+    // util.inspect.custom support for node 6+
+    /* istanbul ignore else */
     if (util.inspect.custom) {
       this[util.inspect.custom] = this.inspect;
     }

lib/response.js

@@ -572,11 +572,12 @@ module.exports = {
 };
 
 /**
- * Custom inspection implementation for newer Node.js versions.
+ * Custom inspection implementation for node 6+.
  *
  * @return {Object}
  * @api public
  */
+/* istanbul ignore else */
 if (util.inspect.custom) {
   module.exports[util.inspect.custom] = module.exports.inspect;
 }

test/application/respond.js

@@ -683,6 +683,28 @@ describe('app.respond', () => {
         .expect('Content-Type', 'application/json; charset=utf-8')
         .expect('{"hello":"world"}');
     });
+    describe('and headers sent', () => {
+      it('should respond with json body and headers', () => {
+        const app = new Koa();
+
+        app.use(ctx => {
+          ctx.length = 17;
+          ctx.type = 'json';
+          ctx.set('foo', 'bar');
+          ctx.res.flushHeaders();
+          ctx.body = { hello: 'world' };
+        });
+
+        const server = app.listen();
+
+        return request(server)
+          .get('/')
+          .expect('Content-Type', 'application/json; charset=utf-8')
+          .expect('Content-Length', '17')
+          .expect('foo', 'bar')
+          .expect('{"hello":"world"}');
+      });
+    });
   });
 
   describe('when an error occurs', () => {

test/response/length.js

@@ -5,23 +5,21 @@ const response = require('../helpers/context').response;
 const assert = require('assert');
 const fs = require('fs');
 
-describe('res.length', () => {
-  describe('when Content-Length is defined', () => {
-    it('should return a number', () => {
-      const res = response();
-      res.header['content-length'] = '120';
-      assert.equal(res.length, 120);
-    });
-  });
-});
-
 describe('res.length', () => {
   describe('when Content-Length is defined', () => {
     it('should return a number', () => {
       const res = response();
       res.set('Content-Length', '1024');
       assert.equal(res.length, 1024);
     });
+
+    describe('but not number', () => {
+      it('should return 0', () => {
+        const res = response();
+        res.set('Content-Length', 'hey');
+        assert.equal(res.length, 0);
+      });
+    });
   });
 
   describe('when Content-Length is not defined', () => {

test/response/set.js

@@ -25,8 +25,8 @@ describe('ctx.set(name, val)', () => {
 
   it('should set a field value of array', () => {
     const ctx = context();
-    ctx.set('x-foo', ['foo', 'bar']);
-    assert.deepEqual(ctx.response.header['x-foo'], [ 'foo', 'bar' ]);
+    ctx.set('x-foo', ['foo', 'bar', 123 ]);
+    assert.deepEqual(ctx.response.header['x-foo'], [ 'foo', 'bar', '123' ]);
   });
 });