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bjones01001101
bjones01001101

Reputation: 1181

Postman test to parse json response body and validate there are no duplicate values in array

I would like to write a test in Postman that validates there are no duplicate values in the array of objects. Here is an example response:

{
    "customerNumber": "123",
    "customCategories": [
        {
            "customCategoryID": "1546",
            "customCategoryDesc": "7100",
            "itemNumbers": [
                "7205",
                "1834"
            ]
        },
        {
            "customCategoryID": "1547",
            "customCategoryDesc": "7130",
            "itemNumbers": [
                "2251",
                "9832"
            ]
        },
        {
            "customCategoryID": "1548",
            "customCategoryDesc": "7315",
            "itemNumbers": [
                "1225541",
                "1197233"
            ]
        },
        {
            "customCategoryID": "1546",
            "customCategoryDesc": "7100",
            "itemNumbers": [
                "7205",
                "1834"
            ]
        },
    ]
}

As you can see, "customCategoryID": "1546" is repeated; thus I want a test to fail with this response, as well as display the repeated customCategoryID value ("1546").

I have viewed a couple of answers in this question and this question, but need to use the latest test script syntax for Postman has updated their JS library as well as have an assertion for the duplicated data.

Assistance with this is much appreciated.

Upvotes: 2

Views: 2690

Answers (1)

Danny Dainton
Danny Dainton

Reputation: 25911

You could try something like this to check for duplicate ids:

function checkIfArrayIsUnique(array) {
  return array.length === new Set(array).size;
}

pm.test('Check is Ids are unique', () => {
    let ids = []
    _.each(pm.response.json().customCategories, (item) => {
        ids.push(item.customCategoryID)
    })

    pm.expect(checkIfArrayIsUnique(ids), ids).to.be.true
})

It's looping through the customCategoryID property of each object in the customCategories array and storing that value in the ids array.

The checkIfArrayIsUnique function is taking that ids array and using the Set method to help with the comparison.

The Set method creates a new object, from the ids array, that only contains unique values so it's checking to see if the ids array length matches the new Sets size, this returns either true or false.

There's a basic pm.expect() statement to check if the checkIfArrayIsUnique function returns true, if it's not unique it will return false and fail the test.

Postman Test

Upvotes: 2

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