A lot of time I had asked the same questions to me, I couldn’t find the right answers. I have collected metrics from my current projects ,what they are thinking in terms of bug free software application.
Since we had done two RCA on production defects in the current year and listed the outcomes.
There is no check in micro service for negative stock.
Missed scenario during development and testing
Boundaries are not Tested based on cost status (S, G)
Data pull job is not tested
Not tested against real data especially for dc discount
Don't have functional and unit test for events.
There are best practices one can engage to reduce the probability of bugs from appearing.
In real world , Is there any application with 100% bug free? No, its impossible to certify 100% bug free application but we can deliver workable software to customers. How does google ensure quality of application to end-users?
We can see related information : http://googletesting.blogspot.in/2011/01/how-google-tests-software.html
From My experience :
If we meet the following expectation of customer ,then we are delivering the bug free application
The client should be happy with delivery,and it should meet their expectation.
End users should not have difficulty to use the application.
Enough help or guide should be provided to end users.
They should not ask , any queries to understand the functionality.
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