Crafting a Spring Cloud Contract with Multiple RequestParts

Описание: Learn how to effectively write a Spring Cloud Contract that handles multiple `RequestParts`. Discover tips to ensure success while maintaining structure in your tests.
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This video is based on the question https://stackoverflow.com/q/72114756/ asked by the user 'Rob H' ( https://stackoverflow.com/u/19033971/ ) and on the answer https://stackoverflow.com/a/72140151/ provided by the user 'Rob H' ( https://stackoverflow.com/u/19033971/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Crafting a Spring Cloud Contract with Multiple RequestParts

When developing applications using Spring, there may be instances where you need to handle multiple RequestParts in your API endpoints. This guide will guide you through the process of writing an effective Spring Cloud Contract for an endpoint that accepts multiple multipart file uploads.

The Problem

In our situation, we have an endpoint defined with the following signature:

[[See Video to Reveal this Text or Code Snippet]]

The challenge lies in creating a contract that effectively tests this endpoint with multiple RequestParts. Initially, attempts were made to structure the contract while utilizing RequestParams, which succeeded. However, the goal was to maintain the use of RequestParts.

The Solution

Understanding the Error

Upon reflection, the primary issue identified was the omission of square brackets inside the multipart definition. These brackets are crucial for correctly defining an array of RequestParts.

Crafting the Correct Contract

Here’s how the corrected contract looks, with proper use of multipart and defined RequestParts:

[[See Video to Reveal this Text or Code Snippet]]

Breakdown of the Contract

Request Mapping: The contract specifies the URL path and the HTTP method (POST).

Headers: The Content-Type is explicitly set to multipart/form-data, which is essential for the endpoint to handle multipart requests correctly.

Multipart Structure:

Each piece of data (e.g., name, test, files) is defined within the multipart call using the named method.

The value method is used to indicate the expected data format:

consumer(regex(nonEmpty())) ensures that the input must be a non-empty string.

producer(...) provides sample data for testing.

Expected Response

The response is straightforward, expecting a status of ACCEPTED() upon successful processing of the request, confirming that the files have been successfully handled by the API.

Conclusion

Creating a Spring Cloud Contract that accurately reflects the requirements of your API can be tricky, especially when dealing with multiple RequestParts. By ensuring the proper structure using square brackets and validating the input through regex expressions, you can write effective tests that maintain the integrity of your code.

Explore these practices to maintain a robust and reliable API that adheres to your specifications!