OSLogStorage contains a log message

OSLogStore+AssertContains.swift

import OSLog
import XCTest

extension OSLogStore {
    static func entities(
        subsystem: String? = nil,
        category: String? = nil
    ) throws ->  [OSLogEntryLog] {
        let logStore = try OSLogStore(scope: .currentProcessIdentifier)
        let enumerator = try logStore.__entriesEnumerator(position: nil, predicate: nil)
        return Array(enumerator)
            .compactMap { $0 as? OSLogEntryLog }
            .filter {
                let matchesSubsystem = subsystem == nil || $0.subsystem == subsystem
                let matchesCategory = category == nil || $0.category == category
                return matchesSubsystem && matchesCategory
            }
    }

    /**
     Asserts that the logs contains a message

     Usage:
     ```swift
   func test_SystemUnderTest_logs_Error() async {
       let sut = SystemUnderTest(
           doWork: {
               throw SystemUnderTest.FailureHappened()
           }
       )
       let _ = try? await sut.doWork()
       OSLogStore.AssertContains(
           subsystem: SystemUnderTestModule.subsystem,
           category: SystemUnderTest.logCategory,
       """
       SystemUnderTestModule.SystemUnderTest.FailureHappened()
       """
       )
   }
     ```
    */
    public static func AssertContains(
        subsystem: String? = nil,
        category: String? = nil,
        _ message: String,
        file: StaticString = #file,
        line: UInt = #line
    ) {
        let logs = try! OSLogStore.entities(
            subsystem: subsystem,
            category: category
        )

        var messages = [String]()
        for log in logs {
            if log.composedMessage == message { return }
            messages.append(log.composedMessage)
        }
        XCTFail(
            """
            Error not found in logs :
            Expected:
             - \(message)
            Logs:
             - \(messages.joined(separator: "\n - "))
            """,
            file: file,
            line: line
        )
    }
}

inspired by @ole's https://github.com/ole/OSLogStoreTest

let logs = try! OSLogStore.entities(

could be improved ofc