Mini Application
Express app and sinon mocks to the rescue!
Installation
npm i mini-application --save
yarn add -S mini-application
const MiniApplication = require("mini-application")
const miniApp = new MiniApplication();Stub
What happens when you wrap Express middleware with Sinon stub? See below:
Stub simple endpoint
const MiniApplication = require("mini-application")
const miniApp = new MiniApplication();
miniApp.stubApp("/test").respond((req, res) => {
res.end("ok!");
});
miniApp.listen(3000)
.then(() => {
rp.get("http://localhost:3000/test")
.then((response) => {
assert(response.body === "ok!");
});
});Stub different responses
miniApp.stubApp("/test")
.onFirstCall()
.respond((req, res) => res.end("first response"))
.onSecondCall()
.respond((req, res) => res.end("second response"));Stub specific method only
miniApp.stubApp("post", "/test").respond((req, res) => res.end("on post call only"));Use sinon helper
// respond with json
miniApp.stubApp("/test").respond({ text: "json response" });
// or set the status code
miniApp.stubApp("/test").respond(503);
// or just send a text
miniApp.stubApp("/test").respond("ok");Events
It's often helpful to get nice callback the verify the expectations
Simple event emitted for path
request.get("http://localhost:3000/test").end();
miniApp.on("incoming.request@/test", (req) => {
expect(req.url).to.be.equal("/test");
done();
});Interactive
Sometimes it's hard to write a good test without manual verification first. Miniapp should help here too:
bin/mini-application
miniApp - listening on 3000
miniApp > stubApp("/").respond("ok")
# now open http://localhost:3000/ in the browser to see the response
# then you can inspect all requests which were made to the miniApp instance:
miniApp > requests.get("incoming").value()Extendable
For easier testing custom logic can be wrapped as a class extending the MiniApplication base:
class TestApplication extends MiniApplication {
constructor(options) {
super(options);
this.stubApp("get", "test");
}
}
miniApp = new TestApplication();
miniApp.listen(3000)
.then(() => {
request.get("http://localhost:3000/test").end();
miniApp.on("incoming.request@GET/test", (req) => {
expect(req.url).to.be.equal("/test");
});
});
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