levels of testing

Answer Posted / venkat

Unit testing: typically done by developers will do this,
code can be tested.
Integration testing: This is can be done by after
completion of unit testing. All dependent modules can be
tested in this level; in here one module output is input to
the next module,
Ex: login page to home page, home page to account transfer
page.
System testing: here all components of the system are
combined together and test it. Here END-END flow of the
system will be tested.
Acceptance testing: the customer does this; client will be
using the system against the business requirements

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