Support Sendable conformed protocol

[yoshiki-tsukada]

• Resolves: Support @unchecked Sendable #91

Hello! I fixed an error which occurs in my project.

The following code causes an error on Swift 6.

@Spyable
protocol XxxProtocol: Sendable {
    func fetch() async throws -> [String]
}

class XxxProtocolSpy: XxxProtocol { // ❌ Non-final class 'XxxProtocolSpy' cannot conform to 'Sendable'; use '@unchecked Sendable'
    var fetchCallsCount = 0 // ❌ Stored property 'fetchCallsCount' of 'Sendable'-conforming class 'XxxProtocolSpy' is mutable
    var fetchCalled: Bool {
        return fetchCallsCount > 0
    }
    var fetchThrowableError: (any Error)?
    var fetchReturnValue: [String]!
    var fetchClosure: (() async throws -> [String])?
    func fetch() async throws -> [String] {
        fetchCallsCount += 1
        if let fetchThrowableError {
            throw fetchThrowableError
        }
        if fetchClosure != nil {
            return try await fetchClosure!()
        } else {
            return fetchReturnValue
        }
    }
}

To solve this error, I added @unchecked Sendable conformance to all Spy classes.

Sendable conformed protocol:

protocol XxxProtocol: Sendable {
    func fetch() async throws -> [String]
}

- class XxxProtocolSpy: XxxProtocol {
+ class XxxProtocolSpy: XxxProtocol, @unchecked Sendable {
...
}

not Sendable conformed protocol:

protocol XxxProtocol {
    func fetch() async throws -> [String]
}

- class XxxProtocolSpy: XxxProtocol {
+ class XxxProtocolSpy: XxxProtocol, @unchecked Sendable {
...
}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.20%. Comparing base (c81a4c3) to head (8ea114a).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #133   +/-   ##
=======================================
  Coverage   97.20%   97.20%           
=======================================
  Files          21       21           
  Lines        1072     1075    +3     
=======================================
+ Hits         1042     1045    +3     
  Misses         30       30           

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[Matejkob]

Looks great! Thank you for your contribution!