<< Chapter < Page
  Software engineering     Page 10 / 15
Chapter >> Page >

Based on the software engineer’s intuition and experience

Ad hoc testing

Perhaps the most widely practiced technique remains ad hoc testing: tests are derived relying on the software engineer’s skill, intuition, and experience with similar programs. Ad hoc testing might be useful for identifying special tests, those not easily captured by formalized techniques.

Exploratory testing

Exploratory testing is defined as simultaneous learning, test design, and test execution; that is, the tests are not defined in advance in an established test plan, but are dynamically designed, executed, and modified. The effectiveness of exploratory testing relies on the software engineer’s knowledge, which can be derived from various sources: observed product behavior during testing, familiarity with the application, the platform, the failure process, the type of possible faults and failures, the risk associated with a particular product, and so on.

Specification-based techniques

Equivalence partitioning

The input domain is subdivided into a collection of subsets, or equivalent classes, which are deemed equivalent according to a specified relation, and a representative set of tests (sometimes only one) is taken from each class.

Boundary-value analysis

Test cases are chosen on and near the boundaries of the input domain of variables, with the underlying rationale that many faults tend to concentrate near the extreme values of inputs. An extension of this technique is robustness testing, wherein test cases are also chosen outside the input domain of variables, to test program robustness to unexpected or erroneous inputs.

Decision table

Decision tables represent logical relationships between conditions (roughly, inputs) and actions (roughly, outputs). Test cases are systematically derived by considering every possible combination of conditions and actions. A related technique is cause-effect graphing.

Finite-state machine-based

By modeling a program as a finite state machine, tests can be selected in order to cover states and transitions on it.

Testing from formal specifications

Giving the specifications in a formal language allows for automatic derivation of functional test cases, and, at the same time, provides a reference output, an oracle, for checking test results. Methods exist for deriving test cases from model-based or algebraic specifications.

Random testing

Tests are generated purely at random, not to be confused with statistical testing from the operational profile. This form of testing falls under the heading of the specification-based entry, since at least the input domain must be known, to be able to pick random points within it.

Code-based techniques

Control-flow-based criteria

Control-flow-based coverage criteria is aimed at covering all the statements or blocks of statements in a program, or specified combinations of them. Several coverage criteria have been proposed, like condition/decision coverage. The strongest of the control-flow-based criteria is path testing, which aims to execute all entry-to-exit control flow paths in the flowgraph. Since path testing is generally not feasible because of loops, other less stringent criteria tend to be used in practice, such as statement testing, branch testing, and condition/decision testing. The adequacy of such tests is measured in percentages; for example, when all branches have been executed at least once by the tests, 100% branch coverage is said to have been achieved.

Questions & Answers

which sdlc mode l is suitable for atm banking system
Rakesh Reply
HUAWEI.ABBULLAG.45720891
Abdula Reply
how to build apps
Andreas Reply
what is memory?
Hausa Reply
memory is billions of consecutive data storage cell where each of the cell has its own particular address of identification.
Shariful
what are the major difference in the external environment of an office automation system and that of an embedded systems
juma Reply
What is software engineering
Zohaib Reply
what is salary of a software engineer
Akash Reply
understand wllhi 😭am language somali bro 😇😣😣😣
what is agile
Qais Reply
what do you want
help
Billy
how to U download
Adam Reply
hi is there any mobile spy app best you know?
muddy Reply
what is software engineer
Soumen Reply
Who make the software he is the software engineer.
thando
i don't
Al
mobile spy android need it any one help me
muddy
🤔
I want to create a game
Rohith Reply
Requirements to create game
Rohith
yes i also
GURPREET
want to knoe about the reqirements
GURPREET
Yes
Rohith
what are software evolution processes
Software Evolution is a term which refers to the process of developing software initially, then timely updating it for various reasons, i.e., to add new features or to remove obsolete functionalities etc. ... If the proposed changes are accepted, a new release of the software system is planned
Fenkil

Get the best Software engineering course in your pocket!





Source:  OpenStax, Software engineering. OpenStax CNX. Jul 29, 2009 Download for free at http://cnx.org/content/col10790/1.1
Google Play and the Google Play logo are trademarks of Google Inc.

Notification Switch

Would you like to follow the 'Software engineering' conversation and receive update notifications?

Ask