why a developer is not good tester?

Answer Posted / vidhya

A developer is the person who builds the application. He
will look at it only from his perspective. He will be blind
to the errors which exist in his applications coz he sees
what he wants to see. Of course the main functionality will
be correct. It is the small details he might miss while
development. It is the duty of tester to have an eye for
all the small details and break the application by giving
in all types of data and creating all possible scenarios.

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