Question 1

How to mock a Swift struct with Cuckoo?

Accepted Answer

Cuckoo cannot mock structs directly. The README suggests using a common protocol as a workaround, but this requires refactoring your code to rely on protocols instead of concrete struct types.

Question 2

Cuckoo vs Mockingbird for Swift testing?

Accepted Answer

Cuckoo uses compile-time generation for type safety and supports complex features like generics, while Mockingbird offers runtime mocking with easier setup. Choose Cuckoo for robust, large-scale tests but be prepared for more configuration.

Question 3

How to set up Cuckoo with Swift Package Manager?

Accepted Answer

Add Cuckoo as a dependency to your test target in Package.swift, then add the CuckooPluginSingleFile to Build Phases. Ensure the plugin runs before compilation to generate mocks, as per the installation guide.

Question 4

Why does Cuckoo crash with segmentation fault for custom types?

Accepted Answer

This happens when custom types don't conform to Matchable. You must implement an equal(to:) method using ParameterMatcher, as described in the custom matchers section, to provide equality logic.

Question 5

Can Cuckoo mock async/await methods in Swift?

Accepted Answer

The README doesn't explicitly cover async/await support; Cuckoo might have limitations here. Check the changelog or issues for updates, as you may need to handle async methods manually in stubs.

Question 6

How to verify method calls with arguments in Cuckoo?

Accepted Answer

Use the verify function with parameter matchers like equal(to:) or any(). For example, verify(mock).greetWithMessage("Hello world") checks specific calls, and ArgumentCaptor can capture values for inspection.

Cuckoo

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