/**
 * Test Utilities
 * Shared helper functions for testing
 */
/// <reference types="node" resolution-mode="require"/>
/// <reference types="node" resolution-mode="require"/>
import { type JWTPayload } from 'jose';
import type { DPoPKeyPair } from './types.js';
/**
 * Base64url encode (URL-safe base64)
 */
export declare function base64UrlEncode(buffer: Buffer): string;
/**
 * Base64url decode
 */
export declare function base64UrlDecode(str: string): Buffer;
/**
 * Verify JWT signature and return payload
 */
export declare function verifyJWT(jwt: string, publicKey: CryptoKey): Promise<JWTPayload>;
/**
 * Verify DPoP JWT signature
 */
export declare function verifyDPoPJWT(jwt: string, keyPair: DPoPKeyPair): Promise<JWTPayload>;
/**
 * Generate SHA256 hash and base64url encode (same as S256 PKCE challenge)
 */
export declare function sha256Base64Url(input: string): string;
/**
 * Generate test ES256 key pair
 */
export declare function generateTestKeyPair(): Promise<DPoPKeyPair>;
/**
 * Export public key as JWK
 */
export declare function exportPublicKeyAsJWK(publicKey: CryptoKey): Promise<Record<string, unknown>>;
/**
 * Create mock HTTP response headers
 */
export declare function createMockHeaders(headers?: Record<string, string>): Record<string, string>;
/**
 * Create mock HTTP response with DPoP nonce
 */
export declare function createMockResponseWithNonce(body: unknown, nonce: string): {
    statusCode: number;
    headers: Record<string, string>;
    body: string;
};
/**
 * Create mock HTTP error response with use_dpop_nonce
 */
export declare function createMockDPoPNonceError(nonce: string, statusCode?: number): {
    statusCode: number;
    headers: Record<string, string>;
    body: string;
};
/**
 * Sleep utility for testing async behavior
 */
export declare function sleep(ms: number): Promise<void>;
/**
 * Generate random string for testing
 */
export declare function randomString(length?: number): string;
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