Sinon fake server example

gistfile1.js

test(".save persists the model to the server and adds the ID to the attributes", function() {
  var page, persistenceId, server;
  
  // Create a fake server to block AJAX requests
  server = sinon.fakeServer.create();
  
  // Upon receiving a request to '/pages', respond with an ID
  persistenceId = 6;
  server.respondWith(new RegExp("/pages"), JSON.stringify({
    id: persistenceId
  }));
  
  page = new Page();
  page.save();
  
  // Respond to the pending requests
  server.respond();
  
  // We want to restore the server even if the assertions fail, so we use a finally block
  try {
    assert.strictEqual(page.id, persistenceId, "Expected the page to have the ID set from the server response");
  } finally {
    server.restore();
  }
});