Test Env Vs Staging Env(Production)

Why does production and test environments need to be similar?

The testing environment has a finite set of parameters in which to explore specific features of the app. The staging environment, on the other hand, is accessible through all possible devices and provides interaction with the app as though it was live. Yet it's not. 

The idea with a staging environment is, if a bug happens to escape the test environment, then staging can catch it before it gets passed along to customers. New versions and features are often run under staging conditions before final deployment. Teams try painstakingly to replicate production with their staging environments. Unfortunately, no matter how hard you try to simulate production, anomalies will nevertheless arise when you finally do put a feature out into the real world. 

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