beforeEach(function() {
this.addMatchers({
toBeInstanceOf: function(expectedInstance) {
var actual = this.actual;
var notText = this.isNot ? " not" : "";
this.message = function() {
return "Expected " + actual.constructor.name + notText + " is instance of " + expectedInstance.name;
};
return actual instanceof expectedInstance;
}
});
});