Question

In order to increase test coverage of my project, I’m starting to build tests for existing JS code.

One of the existing modules puts the window height in a variable with jQuery:
var window_height = jQuery(window).height();
Internally jQuery uses the clientHeight property.

Now with either mvn clean install or mvn -o test I’m getting the error:
Cannot read property “clientHeight” from null

I assume this is because the “virtual browser” that Jasmine creates doesn’t have the window property. Is there any way to make this work?

Answer 1

Thanks Derek for your answer, the idea of overwriting jQuery.height did the trick, but not in a spy.

(function(){
  $.prototype.height = function() {
    var original = $.prototype.height;

    if (this[0] === window) {
      return 800; // Return mock window height
    } else {
      return original.apply(this, arguments);
    }
  } 
})();

In the pom.xml I include this file directly after jQuery in the .