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Software today changes very fast. Features are constantly added, bugs are being fixed, and systems are regularly updated weekly by various companies. For this reason, it often becomes challenging for developers to know whether their product is improving or causing unintended errors with every new modification.

Isolated testing of components no longer guarantees the desired software quality. Assembly testing in software lets you verify that the interconnected modules of complex systems operate cohesively and without unexpected issues under pressure and other real-world conditions. In a nutshell, it serves as a method of early issue detection and naturally fills the gap between unit and system testing.

Enterprise software ecosystems don't stay manageable for long. What starts as a monolithic application becomes a web of microservices, third-party integrations, and mobile clients — each release touching something unexpected. Manual testers are skilled at discovery; they aren't built for repetition at scale.