Extract Noise into a dedicated module

localPackages/Noise/Tests/NoiseTests/TestHelpers.swift

@@ -0,0 +1,42 @@
+//
+// TestHelpers.swift
+// bitchatTests
+//
+// This is free and unencumbered software released into the public domain.
+// For more information, see <https://unlicense.org>
+//
+
+import Foundation
+import CryptoKit
+import BitFoundation
+
+// TODO: Combine with the one from the main target
+final class TestHelpers {
+    static func generateRandomData(length: Int) -> Data {
+        var data = Data(count: length)
+        _ = data.withUnsafeMutableBytes { bytes in
+            SecRandomCopyBytes(kSecRandomDefault, length, bytes.baseAddress!)
+        }
+        return data
+    }
+
+    @MainActor
+    static func waitUntil(
+        _ condition: @escaping () -> Bool,
+        timeout: TimeInterval = 5,
+        pollInterval: TimeInterval = 0.01
+    ) async -> Bool {
+        let start = Date()
+        while !condition() {
+            if Date().timeIntervalSince(start) > timeout {
+                return condition()
+            }
+            try? await sleep(pollInterval)
+        }
+        return true
+    }
+}
+
+func sleep(_ seconds: TimeInterval) async throws {
+    try await Task.sleep(nanoseconds: UInt64(seconds * 1_000_000_000))
+}