Integration Testing

1
Integration Testing

• Presented By
• Nesreen Ahmad

2
Main Points-

• Definition Of Integration Testing.
• Procedure Of Integration Testing.
• Integration Testing Strategies.

3
Definition Of Integrated Testing

• Detects faults that have not been detected
  during unit testing by focusing on small groups
  of components .

4
Procedure Of Integration Testing

• Two or more components are integrated and tested,
  and when no new faults are revealed (discovered),
  additional components are added to the group.
• This procedure allows the testing of increasingly
  more complex parts of the system while keeping
  the location of potential faults relatively
  small.

5
Integration Testing Strategies

• Big Bang Testing.
• Bottom-Up Testing.
• Top-Down Testing.
• Sandwich Testing.

6
Layer I
User Interface (A)
Layer I I
Billing (B)
Event Service (C)
Learning (D)
Layer III
Database (E)
Network (F)
Neural Network (G)
7
First Big Bang Testing

• This strategy assumes that all components are
  first tested individually and then tested
  together as single system.
• Advantage That no additionally test stubs or
  drivers are needed.
• Disadvantage
• 1- It is expensive.
• 2- It is difficult to pinpoint the specific
  components (or combination of components).

8
Second Bottom-Up Testing

• Strategy first tests each component of the bottom
  layer individually, and then integrates them with
  components of the next layer up.

9
User Interface (A)
Event Service (C)
Learning (D)
Billing (B)
Neural Network (G)
Network (F)
Database (E)
- Bottom-Up test strategy -
10

• Advantage Interface faults can be more easily
  found.
• Disadvantage Faults found in the top layer may
  often lead to change in the subsystem
  decomposition or in the subsystem interfaces of
  lower layers.

11
Third Top-Down Testing

• Tests the components of the top layer first, and
  then integrates the components of the next layer
  down. When all components of the new layer have
  been tested together, the next layer is selected.

12
User Interface (A)
Event Service (C)
Learning (D)
Billing (B)
Neural Network (G)
Network (F)
Database (E)
- Top-Down test strategy -
13

• Advantage It starts with user interface
  components.
• Disadvantage
• 1-The development of test stub is
  time-consuming and prone error.
• 2- A large number of stubs is usually
  required for testing nontrivial systems.

14
Fourth Sandwich Testing

• Combines the top-down and bottom-up strategies,
  attempting to make use of the best of both.
• There are Three Layers-
• 1-Target Layer (the meat).
• 2-The Layer above the target layer.
• 3-The Layer below the target layer.

15
Top Layer
Test A, B
Test A,B,C,D
Test A
Test A, C
Test A, D
Bottom Layer
Test D,G
Test G
Test F
Test B,E,F
Test E
Test A,B,C,D,E,F,G
- Sandwich Testing Strategy -
16
Top Layer
Test A, B
Test A,B,C,D
Test A
Test A, C
Test A, D
Target Layer
Test B
Test C
Test D
Bottom Layer
Test D,G
Test G
Test F
Test B,E,F
Test A,B,C,D,E,F,G
Test E
- Modified Sandwich Testing Strategy -
17

• The advantage of modified sandwich
• testing Many testing activities can be
  performed in parallel.
• The disadvantage of modified sandwich testing Is
  needed for additional test stubs and drivers.

18
Thank You For Your Attention