An Insight into the Black Box and White Box Software Testing

1
An Insight into the

• Black Box and White Box Software Testing

2

• Software testing is one of the best means to
  affirm the quality of an application and deliver
  error-free software.
• Over the years, software testing has developed
  into a separate discipline providing way to
  numerous different testing techniques that have
  been introduced, scrutinized and considered in
  this area.

3

• However, the two commonly used testing approaches
  include Black box and White box testing

4
White Box Testing?

• White Box Testing is an approach where the tester
  has the knowledge of the internals of a system
  and knows how the system is implemented.
• He employs this knowledge to develop test cases
  that examine the data flow, the control flow, the
  information flow, exception and the error
  handling along with the coding procedures of the
  system.

5
How to write Test Cases for White Box Testing?

• The tester first analyzes and understands the
  structure of the system by examining its code.
• He understands the weak points within the code
  that are most prone to defects.
• He then develops the test cases to cover the
  individual information/ data/ control flows
  within the code.
• The tester also develops the test cases to test
  the proper working of all the functionalities and
  error handling of the system.

6
(No Transcript)
7
Techniques in White Box Testing

• Decision Tests All the decision directions must
  be executed at least once during the software
  testing life cycle.
• Statement Tests All the statements within the
  code must have a test case associated with it so
  that each statement is executed at least once
  during the testing cycle.
• Decision/Condition Tests All the combinations of
  the conceivable conditions within a specific set
  of decisions are to be tested.

8
(No Transcript)
9
Techniques in White Box Testing

• Branch Condition Tests All the conditions in a
  specific decision are tested for proper working
  at least once.
• Multiple Condition Tests This ensures that each
  point of entry within the code is tested at least
  once during the testing lifecycle.
• Data Flow Tests This ensures that all the data
  and variables used within the system are tested
  by passing the specific variables through each
  probable calculation.

10
Black Box Testing

• Black Box Testing is an approach where the tester
  has no idea about the internal working of the
  system that he is testing. The system under the
  test in viewed as a black box.
• These tests can be functional or non-functional,
  however usually functional. The functional tests
  usually include the Manual Tests. This further
  includes Integration Testing, System Testing and
  User Acceptance Testing.
• The higher the level, and therefore the bigger
  and more complex the box, the more black box
  testing method can come into use.

11
How to Write Black Box Testing Test Cases?

• The tester examines the requirements and the
  specifications of the system.
• He explores the systems User Interface and the
  functionality to apprehend the working of the
  processes in the system.
• He then designs the test cases with valid inputs
  and the expected outputs.
• The tester also includes some of the negative
  test cases with invalid inputs and the expected
  outputs, as applicable.

12
(No Transcript)
13
Techniques of Black Box Testing

• Equivalence Class Partitioning Under this
  approach, a set of functions is identified along
  with its corresponding inputs (valid and invalid)
  and expected outcomes. This technique aims at
  identifying classes of errors and therefore
  reducing the total of test cases required.
• Boundary Value Analysis This approach is focused
  on testing the boundary values associated with
  the system. It aims at testing the boundaries of
  the input domain that have the highest
  probability of giving inaccurate outcomes.
• Error Guessing This approach is often used by
  experienced testers to identify the defects and
  then develop the corresponding test cases.

14

• Want more insights on the Black Box- White Box
  Testing concept? Get in contact with BugRaptors,
  a CMMi5 certified quality assurance company with
  an extensive experience in various software
  testing techniques and services. Visit the
  website here.

15
(No Transcript)