Pinpoint a problem in data array in case of failure

Ask the Experts and Postman Tips
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1

Hello, guys! How I can solve this: In my test, I check the response body like this:

pm.test("Should have correct response body", function () {
    var expectedJson = JSON.parse(expectedBody);
    var keys = Object.keys(expectedJson);
    var jsonData = pm.response.json();
    keys.forEach(key => pm.expect(jsonData[key]).to.eql(expectedJson[key], "Wrong value for " + 
    key));
});

But if I have a mismatch in value in the array I have a message where output only name of the array where was a mistake: Should have a correct response body

AssertionError: Wrong value for filterDataUi: expected { Object (locations, types, ...) } to deeply equal { Object (locations, types, ...) } ,

but I want to see here the name of key and value where was incorrect value.
For example :

AssertionError: Wrong value for batteries: expected '0.0 kWh' to deeply equal '0.1 kWh' .

It doesn’t work with arrays

2

Hi @drunyak!

Could you clarify what your specific goal/query is?

What other solutions/workarounds have you tried thus far?

3

Hi, Sure. 1. I want to check response body. I mean to check key and value JSON response body. We often update our project and I wanna know if response body comes with a wrong value and I wanna know where the value was changed and for whom
2. I’ve tried with .xor() or _.differenceWithm (https://stackoverflow.com/q/38865869/11922633), but I don’t have enough experience (I’m a newbie)

4

Can you provide an example of what those 2 expected values are please?

It will be easier to run this locally with a mock of the response body and the expected body.

5

For example . I have expected body :

const expectedBody = {"filter":{"locations":["Easteighborhood","Northern","Southern"],"types":["Industrial"],"users":["Consumer1"],"met":["5000"],"select":["500"],"val_u":["Cons"],"ders":["storage","storage","value_x","value_y","storage"],"Type":""},"Map":{"Consum":[1.0,1.0,1.0,1.0,1.0,1.0,1.0,1.0,1.0,1.0,1.0,1.0,1.0,1.0,1.0,1.0,1.0,1.0,1.0,1.0,1.0]

If I got response body like this:

{"filter":{"locations":["Ea**changevalue**","Northern","Southern"]..........

My test was failed and output:

Should have correct response body | AssertionError: Wrong value for filter: expected { Object (locations, types, ...) } to deeply equal { Object (locations, types, ...) }

But I don’t know what the value and key are incorrect. (It will be hard to search an error for our devs)

I wanna see like this :

AssertionError: Wrong value for location: expected 'Easteighborhood' to deeply equal 'Ea**changevalue**'.
6

I mean this returns unhelpful output when comparing json objects. I compare two objects with the eql / deep.equal assertion, and they are not equal.
At the momen the return is something like:
AssertionError: expected { Object (...) } to deeply equal { Object (...) }

This return is not helpful at all, as there is no reporting on the differences.
I would expect something like this:

AssertionError: expected { Object (...) } to deeply equal { Object (...) } + diff like output of (for example) the stringified json representation.

That would make debugging so much easier! Is it possible to do?

7

These messages are coming from the Chai library that used to do the assertion.

From the test at the beginning of your thread it looks like you’re checking the keys - wouldn’t some form of schema validation be better in this situation?

That would give you the ability to check a number of different aspects of the response and also give you a list of items that don’t meet the criteria.

These two videos might help give an idea of how to perform this checks:

1 Like
8

I spent on this 2 days . And as I know validation schema only validate struct JSON and types, not values… And we often have updates our project and if I wanna update all my tests I have to Ctrl+c / Ctrl+v for updates this. Not a good way. And can you give me example how I can implement(solve) (for your guides) my problem , if I don’t right