koa-lite/test/application/use.js

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'use strict';
const request = require('supertest');
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const Koa = require('../..');
describe('app.use(fn)', function(){
it('should compose middleware', function(done){
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const app = new Koa();
const calls = [];
app.use(function *(next){
calls.push(1);
yield next;
calls.push(6);
});
app.use(function *(next){
calls.push(2);
yield next;
calls.push(5);
});
app.use(function *(next){
calls.push(3);
yield next;
calls.push(4);
});
const server = app.listen();
request(server)
.get('/')
.expect(404)
.end(function(err){
if (err) return done(err);
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calls.should.eql([1, 2, 3, 4, 5, 6]);
done();
});
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});
it('should error when a non-generator function is passed', function(){
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const app = new Koa();
try {
app.use(function(){});
} catch (err) {
err.message.should.equal('app.use() requires a generator function');
}
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});
it('should not error when a non-generator function is passed when .experimental=true', function(){
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const app = new Koa();
app.experimental = true;
app.use(function(){});
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});
});