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Luckily, all these responsibilities already fit nicely into our Battery Alarms module. So, this module adheres to fundamental principles of modularity (High Cohesion, Low Coupling, Information Hiding), but it ignores testability. Right now, we can only test Alarms using Integration Tests. (In theory, we could analyze the codebase, find boundaries, segregate classes internally, and introduce seams. But in practice, it will start to rot over time, especially when new people are introduced to the project).