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Denna testklass verifierar funktionaliteten i BookingSystem-klassen, inklusive bokning, avbokning och validering av indata. Testfallen täcker både lyckade scenarier och olika typer av fel, såsom ogiltiga tider, null-värden och konflikter med befintliga bokningar. Mockade beroenden används för att isolera systemet under test och säkerställa att endast logiken i BookingSystem testas.