What is the best way to test an external Data Transfer Object (DTO

I am looking to test an external Data Transfer Object (DTO) that undergoes frequent changes.

For example:

Here is a sample JavaScript (JSON) file below:

// JavaScript
const type User = {
    id: Number,
    name: String
}

// JSON
user: {
   id: Number,
   name: String,
}

Recently, the external API response has been modified.

// Example 1) Updated Response (Add)
{
    id: Number,
    name: String,
    age: Number
}

// Example 2) Updated Response (Remove)
{
    id: Number
}

// and so forth.

I am seeking a way to detect failures and update the JavaScript file accordingly.

So, how can I effectively test this external DTO?

In simpler terms, I need to verify any property changes.

Answer №1

Let's consider a scenario where you receive an API response along with a User object/class

const apiResponse = '{ "id": 1, "name": "someName", "missingProperty": 1 }';
const response = JSON.parse(apiResponse);

const User = {
    id: Number,
    name: String,
    newProperty: Boolean,
}

The following validation checks for missing properties in the response

for(const key in User) {
    if(!(key in response)) {
        console.error(`Missing property from response ${key}`);
    }
}

This validation is to identify any missing properties in the User model

for(const key in response) {
    if(key in User) {
        if(response[key].constructor === User[key]) {
            continue;
        }
        console.error(`${key} is not of the correct type, ${response[key].constructor} instead of ${User[key]}`);
    }
    console.error(`Missing property from model ${key}`);
}

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