Compare response in jest unit test case

Swarup Chavan 0
Viewed 21

I'm new to jest unit test case scenario, I have a scenario where in the response from the service that I called is of the below format

Artifact {
        name: 'detection-v1.zip',
        file_path: 'artifact\\bn-ds-anomalydetection-v1.zip',
        is_tenant: false,
        metadata: [
          Registerfact {
            name: 'ad',
            _meta: [Object],
            line_meta: [Object]
          },
          Registerfact {
            name: 'ad-generic',
            _meta: [Object],
            line_meta: [Object]
          }
        ]
      }

how can i compare the above response in the jest service , I was trying to create a object but the Artifact name before the object is confusing how should i proceed

The test case is

test('test processArtifact method', async()=>{
    const mockGetRestClient = jest.fn();
    
    try{
      const response = await factService.processfact(artifact)
      console.log("response---",response)
      // expect(response).toEqual()
    }
    catch(e){ }
  })

I know its silly question ,but i'm confused hence posted it.

How should i create the static object to be put in .toEqual() ?

ts-jest jestjs javascript
2 Answers

You can declare a global/static var with your response object on top of file. Or better declare it in some constants file and import here.

For Comparison: Usually, if you have a simple object, you can use JSON.stringify. However, it may give error due to different order of object keys.

You should use assert for the deep comparison. There is method assert.deepEqual() which does deep comparison of objects.

an example for using assert from official docs

import assert from 'node:assert';

const obj1 = {
  a: {
    b: 1
  }
};
const obj2 = {
  a: {
    b: 2
  }
};
const obj3 = {
  a: {
    b: 1
  }
};
const obj4 = Object.create(obj1);

assert.deepEqual(obj1, obj1);
// OK

// Values of b are different:
assert.deepEqual(obj1, obj2);
// AssertionError: { a: { b: 1 } } deepEqual { a: { b: 2 } }

assert.deepEqual(obj1, obj3);
// OK

// Prototypes are ignored:
assert.deepEqual(obj1, obj4);
// AssertionError: { a: { b: 1 } } deepEqual {}

Hope this helps, let me know if you have any questions.

Waleed Ahmad0

You can use JSON.stringify in order to convert your object into a string and then compare this result to the one you expect.

console.log(JSON.stringify({
        name: 'detection-v1.zip',
        file_path: 'artifact\\bn-ds-anomalydetection-v1.zip',
        is_tenant: false,
        metadata: [
          {Registerfact: {
            name: 'ad',
            _meta: {},
            line_meta: {}
          }},
          {Registerfact: {
            name: 'ad-generic',
            _meta: {},
            line_meta: {}
          }}
        ]
      }));

Lajos Arpad0
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