Jasimine jQuery matchers.js

beforeEach(function() {
  this.addMatchers({

    toBeVisible: function() {
      var actual = $(this.actual);
      var basicMessage = "be visible";
      return this._reportWithNonExistant(
        actual.is(':visible'),
        basicMessage,
        "Expected '$(" + actual.selector + ")' to " + basicMessage + " but was not"
        );
    },
    toNotBeVisible : function() {
      var actual = $(this.actual);
      var basicMessage = "be hidden";
      return this._reportWithNonExistant(
        !actual.is(':visible'),
        basicMessage,
        "Expected '$(" + actual.selector + ")' to " + basicMessage + " but was not"
        );
    },

    toBeSameJqueryObjectAs : function(expected) {
      var errorMessage = null;
      var basicMessage = "to be the same jQuery object as '$(" + expected.selector + ")'";
      if (!expected || !this.actual || this.actual.length != expected.length) {
        errorMessage = "but was not";
      } else {
        for (var i = 0; i < expected.length; i++) {
          if (this.actual.get(i) != expected.get(i)) {
            errorMessage = "but were not";
            break;
          }
        }
      }
      return this._reportWithNonExistant(errorMessage == null, basicMessage, "Expected '$(" + this.actual.selector + ")' to " + basicMessage + " " + errorMessage);
    },

    _reportWithNonExistant: function(test, basicMessage, fullMessage) {
      var actual = $(this.actual);
      if (actual.length > 0) {
        if (test) {
          return test
        } else {
          throw new Error(fullMessage)
        }
      } else {
        throw new Error('Expected $("' + actual.selector + '") to ' + basicMessage + ' but the element did not exist.')
      }
    }

  });
});