interface DatabaseEntity {
    _id?: any;
    id?: any;
    createdAt?: Date;
    updatedAt?: Date;
    [key: string]: any;
}
interface ApiResponse {
    status: number;
    body?: any;
    data?: any;
    headers?: Record<string, string>;
}
interface EmailExpectation {
    to?: string;
    subject?: string;
    body?: string;
    [key: string]: any;
}
interface AssertionOptions {
    count?: number;
    index?: number;
}
declare class AssertionHelper {
    static assertDatabaseEntity(entity: DatabaseEntity, expectedProperties?: Record<string, any>): void;
    static assertApiResponse(response: ApiResponse, expectedStatus: number, hasData?: boolean): void;
    static assertEmailSent(expectedEmail?: EmailExpectation, options?: AssertionOptions): void;
    static assertArray(array: any[], expectedLength?: number, itemValidator?: (item: any) => void): void;
    static assertObjectStructure(obj: any, requiredProps: string[], optionalProps?: string[]): void;
    static assertTimingConstraint(actualDuration: number, maxDuration: number, operation?: string): void;
}
export { AssertionHelper };
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