so-26217681-mock-db-test.js

var mockDB = {
  _data: [],
  store: function (data) {
    this._data.push(data);
  }
};

beforeEach(function () {
  // reset the mockDB every time
  mockDB._data = [];
});

// the controller holds a reference to the mockDB, and will write to it
var matchController = new MatchController(mockDB);

it("holds the JSON response correctly in memory", function() {
  
  var mockJSON = [{id: 1, name: 'spinach'}];
  //...
  
  matchController.list(function (error, response, body) {
    // something like this...
    expect(mockDB._data).to.include(mockJSON[0]);
  });

});