Test API toMatchObject() jest expect function - node.js

Question

I'm trying to check if a response from the body matches partially an object of data "partialLaunchData" . I'm surprised to get this error:
● Test POST /launches › It should respond with 201 success created
expect(received).toMatchObject(expected)
- Expected - 3
+ Received + 13
Object {
- "mission": "Kepler_155",
- "rocket": "Explorer IS1",
- "target": "Kepler-186 f",
+ "launch": Object {
+ "customer": Array [
+ "SAFTA",
+ "NASA",
+ ],
+ "flightNumber": 101,
+ "launchDate": "2022-10-13T21:24:59.189Z",
+ "mission": "Kepler Exploration x",
+ "rocket": " Explorer IS1",
+ "success": true,
+ "target": "Kepler-442",
+ "upcoming": true,
+ },
}
42 | const responseDate= Date(response.body.launchDate).valueOf();
43 | expect(responseDate).toBe(requestDate);
> 44 | expect(response.body).toMatchObject(partialLaunchData);
| ^
45 | })
46 | //tests on the propreties sent
47 | test('It should catch missing required propreties', ()=>{});
at Object.toMatchObject (src/routes/launches/launches.test.js:44:31)
Test Suites: 1 failed, 1 total
Tests: 1 failed, 3 passed, 4 total
Snapshots: 0 total
Time: 3.452 s
Ran all test suites.
This is my Code in the launches.test.js file describing a post Test on launches path "/launches" .
describe( 'Test POST /launches ', ()=> {
// test the response
const completeLaunchData={
// flightNumber: 100,
mission: 'Kepler Exploration x',
rocket: ' Explorer IS1',
launchDate: new Date(),
target: 'Kepler-442',
// customer: ['SpaceX, NASA'],
// upcoming: true,
}
const partialLaunchData={
// flightNumber: 100,
mission: 'Kepler_155',
rocket: 'Explorer IS1',
target: 'Kepler-186 f',
// upcoming: true,
}
test('It should respond with 201 success created', async()=>{
const response = await request(app).post('/launches')
// comparing two dates and joining them in one format : we will compare the value of the two dates
.send(
completeLaunchData
)
.expect('Content-Type',/json/)
.expect(201);
const requestDate = Date(completeLaunchData.launchDate).valueOf();
const responseDate= Date(response.body.launchDate).valueOf();
expect(responseDate).toBe(requestDate);
expect(response.body).toMatchObject(partialLaunchData);
})
Who has an idea about the issue ? I need help please.