Home > Integration, Testing > Bottom Up Vs Top Down

Bottom Up Vs Top Down

Sl.No

Bottom Up

Top Down

1

The subsystem in the lowest layer of the call hierarchy are tested individually

 

Test the top layer or the controlling subsystem first

 

2

Then the next subsystems are tested that call the previously tested subsystems

 

Then combine all the subsystems that are called by the tested subsystems and test the resulting collection of subsystems

 

 

3

This is done repeatedly until all subsystems are included in the testing

 

 

Do this until all subsystems are incorporated into the test

 

4

Special program needed to do the testing, Test Driver:

 

Ø      A routine that calls a subsystem and passes a test case to it

 

 

Special program is needed to do the testing, Test stub:

 

 

Ø      A program or a method that simulates the activity of a missing subsystem by answering to the calling sequence of the calling subsystem and returning back fake data.

 

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