Test that a missing Accept-Encoding header should not result in compr…

…ession

__tests__/index.js

@@ -245,16 +245,29 @@ describe('Compress', () => {
       .expect(200, done)
   })
 
-  it('should not crash if no accept-encoding is sent', (done) => {
+  it('should not compress if no accept-encoding is sent', (done) => {
     const app = new Koa()
 
-    app.use(compress())
-    app.use(sendBuffer)
+    app.use((ctx, next) => {
+      if('accept-encoding' in ctx.headers)
+        throw new Error(`Unexpected Accept-Encoding: ${ctx.headers['accept-encoding']}`)
+      return next();
+    })
+    app.use(compress({
+      threshold: 0
+    }))
+    app.use((ctx) => {
+      ctx.type = 'text'
+      ctx.body = 'not compressed'
+    })
     server = app.listen()
 
     request(server)
       .get('/')
-      .expect(200, done)
+      .unset('accept-encoding')
+      .expect(res => !('vary' in res.headers))
+      .expect(res => !('content-encoding' in res.headers))
+      .expect('not compressed', done)
   })
 
   it('should not crash if a type does not pass the filter', (done) => {