updated docs

test/backend/params-tests.js

@@ -0,0 +1,56 @@
+const sinon = require('sinon');
+const proxyquire = require('proxyquire').noCallThru();
+
+const storage = {
+  setField: sinon.stub()
+};
+
+function request(id) {
+  return {
+    params: { id },
+    body: {}
+  };
+}
+
+function response() {
+  return {
+    sendStatus: sinon.stub()
+  };
+}
+
+const paramsRoute = proxyquire('../../server/routes/params', {
+  '../storage': storage
+});
+
+describe('/api/params', function() {
+  afterEach(function() {
+    storage.setField.reset();
+  });
+
+  it('calls storage.setField with the correct parameter', function() {
+    const req = request('x');
+    const dlimit = 2;
+    req.body.dlimit = dlimit;
+    const res = response();
+    paramsRoute(req, res);
+    sinon.assert.calledWith(storage.setField, 'x', 'dlimit', dlimit);
+    sinon.assert.calledWith(res.sendStatus, 200);
+  });
+
+  it('sends a 400 if dlimit is too large', function() {
+    const req = request('x');
+    const res = response();
+    req.body.dlimit = 21;
+    paramsRoute(req, res);
+    sinon.assert.calledWith(res.sendStatus, 400);
+  });
+
+  it('sends a 404 on failure', function() {
+    storage.setField.throws(new Error());
+    const req = request('x');
+    const res = response();
+    req.body.dlimit = 2;
+    paramsRoute(req, res);
+    sinon.assert.calledWith(res.sendStatus, 404);
+  });
+});