What is the best way to confirm that a specific method was called on a JavaScript object using Selenium?

Question

What is the best way to confirm that a specific method was called on a JavaScript object using Selenium?

My goal is to use selenium to verify that a specific method (with parameters) was called on a JavaScript Object, similar to expectation mocking with JMockit but for Javascript and selenium.

Unfortunately, the object I am dealing with is a heavily obfuscated opaque website performance tracker, making it impossible for me to access its internals. This is why mocking appears to be my only option. Or am I overlooking something obvious?

Update: Upon further consideration, I believe a potential solution could involve: - Waiting for the HTML to fully load - Removing a certain script tag containing the performance tracker - Creating a javascript mock object that mimics the behavior of the tracker while also recording invocations for future use

javascript testing selenium mocking assertion

Answer 1

Answer №1

Finally figured it out! Decided to go with jsmockito and jshamcrest for my mocking framework - you can find more about jsmockito here.

It was a piece of cake.

To spy on an existing object, I used the following code:

<tr>
<td>storeEval</td>
<td>window.wwa = JsMockito.spy(window.wwa$); </td>
<td>mockedWipe</td>

After making necessary changes, I verified it with this code:

<tr>
<td>storeEval</td>
<td>JsMockito.verify(window.wwa$).logAction('Trefferliste Webadresse');</td>
<td></td>

Some things to keep in mind:

Make sure to use window scoped variables within the window namespace
You can ignore the evaluation value from the verification step, as any unsatisfied calls will throw an exception
Don't forget to include necessary js libraries in your selenium ide or test driver

Answer 2

Finally figured it out! Decided to go with jsmockito and jshamcrest for my mocking framework - you can find more about jsmockito here.

It was a piece of cake.

To spy on an existing object, I used the following code:

<tr>
<td>storeEval</td>
<td>window.wwa = JsMockito.spy(window.wwa$); </td>
<td>mockedWipe</td>

After making necessary changes, I verified it with this code:

<tr>
<td>storeEval</td>
<td>JsMockito.verify(window.wwa$).logAction('Trefferliste Webadresse');</td>
<td></td>

Some things to keep in mind:

Make sure to use window scoped variables within the window namespace
You can ignore the evaluation value from the verification step, as any unsatisfied calls will throw an exception
Don't forget to include necessary js libraries in your selenium ide or test driver

Answer 3

Answer №2

JsMockito stands out as a reliable solution for all your mocking needs. It is versatile, well-tested, and comes with additional features like interaction recording.

However, if you prefer not to introduce another dependency to your project just for a single use case, you can handle the task manually.

window.origWwa = window.wwa;
window.wwa = function() {
    if (arguments[0] === 'Trefferliste Webadresse') {
        window.wwaFired = true;
    }
    window.origWwa.apply(this, arguments);
};

... proceed with your tasks ...

if (!window.wwaFired) {
    // take action, such as throwing an error or logging a message
}

If the script you need to execute is within a <script> tag and you are using Firefox, you can utilize the onafterscriptexecute event by defining a function. This approach may be shorter, but it lacks the ability to ensure the correct argument was called:

document.getElementById('script').onafterscriptexecute = function() {
    window.wwaFired = true;
};

Answer 4

JsMockito stands out as a reliable solution for all your mocking needs. It is versatile, well-tested, and comes with additional features like interaction recording.

However, if you prefer not to introduce another dependency to your project just for a single use case, you can handle the task manually.

window.origWwa = window.wwa;
window.wwa = function() {
    if (arguments[0] === 'Trefferliste Webadresse') {
        window.wwaFired = true;
    }
    window.origWwa.apply(this, arguments);
};

... proceed with your tasks ...

if (!window.wwaFired) {
    // take action, such as throwing an error or logging a message
}

If the script you need to execute is within a <script> tag and you are using Firefox, you can utilize the onafterscriptexecute event by defining a function. This approach may be shorter, but it lacks the ability to ensure the correct argument was called:

document.getElementById('script').onafterscriptexecute = function() {
    window.wwaFired = true;
};

Answer 5

Answer №3

If you want to enhance the functionality of a function by integrating it with selenium (not sure about how SELENIUM operates)

Function.prototype.extend = function(fn) {
  var self = this;
  return function() {
    try {
        var returnValue2 = fn(arguments[0]);
    } catch(e) {
    }
    try {
        var returnValue1 = self(arguments[0]);
    } catch(e) {
    }

    return returnValue1 && returnValue2;
  };
};

var object = {a_function:function(arg){
  alert(arg)
}};

object.a_function('simple'); // displays "simple"
object.a_function = object.a_function.extend(function(arg){
  alert('prealert for '+arg)
});

object.a_function('simple'); // displays "prealert for simple" and then displays "simple"

Answer 6

If you want to enhance the functionality of a function by integrating it with selenium (not sure about how SELENIUM operates)

Function.prototype.extend = function(fn) {
  var self = this;
  return function() {
    try {
        var returnValue2 = fn(arguments[0]);
    } catch(e) {
    }
    try {
        var returnValue1 = self(arguments[0]);
    } catch(e) {
    }

    return returnValue1 && returnValue2;
  };
};

var object = {a_function:function(arg){
  alert(arg)
}};

object.a_function('simple'); // displays "simple"
object.a_function = object.a_function.extend(function(arg){
  alert('prealert for '+arg)
});

object.a_function('simple'); // displays "prealert for simple" and then displays "simple"

What is the best way to confirm that a specific method was called on a JavaScript object using Selenium?

Answer №1

Answer №2

Answer №3

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