Testing Basics - How would you conduct a test: top-down or down-top? What is it? Which one is better?

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How would you conduct a test: top-down or down-top? What is it? Which one is better?

Down-Top: unit -> interface -> system. Top-Down is a vice versa. You may use both, but down-top allows to discover malfunctioning at earlier phases of development and cheaper to fix than in the case of top-down.

Total Answers and Comments: 7

Last Update: November 06, 2007

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March 29, 2006 09:05:45

jsreddy

Member Since: March 2006 Contribution: 9

RE: How would you conduct a test: top-down or down-top...

in integration testing we use top down and down top.

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August 21, 2006 06:18:39

Priscilla

RE: How would you conduct a test: top-down or down-top...

Integration testing means testing the whole application mainly checking the interface and data flow. There are two types of integration testing.

1.Incremental Testing

2.Non-Incremental Testing

Again the Incremental Testing is divided into two types.

1.Top-Down Testing

2.Bottom-Up Testing

Non-Incremental Testing comes under Big bang model where we combine all the modules and test.

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January 02, 2007 05:21:42

jainbrijesh

Member Since: September 2006 Contribution: 1193

RE: How would you conduct a test: top-down or down-top...

Top-down and bottom-up are integration approach not testing approach.It depends on application which one is better to use generally we use combination of both.

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April 06, 2007 03:55:47

Narender Reddy

Member Since: November 2006 Contribution: 13

RE: How would you conduct a test: top-down or down-top...

This concept comes in the integration testing the perpouse of integration testing is combing deffirant modules in our project and cheek the funcationality

In top - down approach testing is conducted from main moduel to sub moduel

In bottom - up appoch testing is conducted from submoduel to main moduel

assume that your project has three modules

example for top - down
m1 -> m2 -> m3 etc

bottom - up

m3 -> m2 -> m1

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September 14, 2007 07:55:23

kumudbajaj

RE: How would you conduct a test: top-down or down-top...

Bottom-up and Top-Down are used in performing incremental integration testing.
In Bottom-up we start the testing from the terminal module (that do not call any other sub module) a driver is produced for every module. Next module to be tested is any module who has previously tested sub ordinate module.
In Top-Down we start the testing from the top most module a stub is produced for every module. Next module to be tested is any module who has preveously tested super ordinate module.

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October 15, 2007 09:51:51

G.Raghevender

RE: How would you conduct a test: top-down or down-top...

top down and down top are both comes under the integration testing.

Top-down:

It means core modules are designed and tested first after that proceeding to other modules.

Here we can replace a module with dummy modules called stubs.

Down-top:

Here base modules are designed and tested first and proceeds to other modules .

here we can use dummy connections b/w different modules called Drivers.

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November 06, 2007 08:17:55

Prabhat

RE: How would you conduct a test: top-down or down-top...

Are you sure these are integration approach rather than testing appoach

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