Скачать или смотреть How to Assert Function Calls in Spock with the Right JSON Format

Learn how to ensure your Spock tests correctly verify method calls with specific parameters, especially when dealing with JSON outputs in Groovy.
---
This video is based on the question https://stackoverflow.com/q/63046979/ asked by the user 'tschumann' ( https://stackoverflow.com/u/5158636/ ) and on the answer https://stackoverflow.com/a/63048840/ provided by the user 'Szymon Stepniak' ( https://stackoverflow.com/u/2194470/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Spock asserting function calls

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Understanding Function Call Assertions in Spock

As a developer using Spock, you may encounter scenarios where you need to verify that your methods are called with the correct arguments. One common problem you might face is ensuring that a method receives a properly formatted JSON string when assertions are made. Let's dive into a typical example and explore how to resolve it.

The Problem

In your testing scenario, you attempted to assert that a method was invoked with specific arguments. Here’s the first assertion you made that passed:

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

However, when you changed the assertion to use a JSON output created with Groovy's JsonOutput.toJson(), it failed:

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

The issue here stems from the fact that the second assertion produces a JSON representation that differs from the string you provided in the first test. Specifically, the second example wraps your expected JSON map in an array (or list), which alters the structure.

The Solution: Correcting Your Assertion

To ensure that your test passes with the JSON output, you need to match the structure that your method is expected to call. Follow these organized steps to resolve your issue:

1. Understand JSON Representation

In Groovy, the way you create JSON can affect how it's structured. The first assertion represents the JSON as a plain string. The second creates JSON from a list containing a map.

2. Adjust Your JSON Structure

Instead of wrapping your map inside a list, produce the expected JSON structure correctly. Change your assertion from this:

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

to this:

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

3. Validate the Change

Now, re-run your Spock test with the updated assertion. The second test should now pass, as it will match the format of your expected output exactly.

Conclusion

Correctly asserting that your method calls receive the expected parameters can be tricky when dealing with JSON structures in Spock. By ensuring that your JSON output matches the anticipated format without unnecessary wrapping, you’ll create tests that not only pass but also accurately verify your application’s behavior.

By following the adjustments outlined in this guide, you can enhance your understanding of function assertions in Spock and confidently handle more complex testing scenarios. Happy testing!