Extract Noise into a dedicated module

localPackages/Noise/Tests/NoiseTests/MockKeychain.swift

@@ -0,0 +1,34 @@
+//
+// MockKeychain.swift
+// bitchat
+//
+// This is free and unencumbered software released into the public domain.
+// For more information, see <https://unlicense.org>
+//
+
+import Foundation
+@testable import Noise
+
+// TODO: Combine with the one from the main target
+final class MockKeychain: SecureMemoryCleaner {
+    /// Thread-safe counter for secureClear calls
+    private let lock = NSLock()
+    private var _secureClearDataCallCount = 0
+
+    var secureClearDataCallCount: Int {
+        lock.lock()
+        defer { lock.unlock() }
+        return _secureClearDataCallCount
+    }
+
+    func secureClear(_ data: inout Data) {
+        lock.lock()
+        _secureClearDataCallCount += 1
+        lock.unlock()
+        data = Data()
+    }
+
+    func secureClear(_ string: inout String) {
+        string = ""
+    }
+}