Generated mocks do not inherit protocol-level @available annotations

[Keitaro0226]

Problem

Currently, when a protocol has @available annotations, the generated mock classes do not inherit these availability constraints. This leads to compilation errors when using the mocks in contexts where availability-constrained types or members are involved.

Example

Input protocol:

/// @mockable
@available(iOS 18.0, *)
public protocol Foo: Sendable {
    func bar()
}

Incorrect generated mock:

public final class FooMock: Foo, @unchecked Sendable { // ❌ Missing @available
    // Mock implementation...
}

Expected mock:

@available(iOS 18.0, *)
public final class FooMock: Foo, @unchecked Sendable {
    // ✅ Correct
}

Real-world Impact

When the generated mock lacks the appropriate @available annotation, any reference to types or members that require specific OS versions results in compile-time errors, even in purely test contexts.

Environment

• mockolo version: 2.4.0
• Xcode version: 16.4
• Swift version: 6.0+

Proposed Solution

Enhance mock generation to:

• Extract protocol-level @available annotations
• Apply them to the generated mock class

---

A draft PR is already available for this feature, and I would appreciate feedback based on that proposed approach:

Draft PR:

Thank you for your time and consideration!

[sidepelican]

More detailed example

@available(iOS 99.0, *)
struct S {}

@available(iOS 99.0, *)
protocol P {
    var s: S { get }
}

class PMock: P {
    let s = S() // 'S' is only available in iOS 99.0 or newer
}