unit testing and debugging

K.Haripritha
II-MSc(Info Tech)
Nadar Saraswathi College of Arts and Science.
Theni

 Static analysis is used to investigate the structural
properties of source code.
 Dynamic test cases are used to investigate the behavior
of source code by executing the program on the test
data

 Unit testing comprises the set of tests performed by an
individual programmer prior to integration of the unit
into a larger system.
 The situation is illustrated as follows:
Coding & debugging- > unit testing
-> integration testing

 A program unit is usually small enough that the
programmer who developed it can test it in great detail,
and certainly in greater detail than will be possible
when the unit is integrated into an evolving software
product.
 There are four categories of tests programmer :
1. Functional tests
2. Performance tests
3. Stress tests
4. Structure tests

 FUNCTIONAL TEST:
 It cases involve exercising the code with
nominal input values for which the expected results are
known, as well as boundary values and special values.
 PERFORMANCE TEST:
 It determines the amount of execution time
spent in various parts of the unit, program throughput,
response time, and device utilization by the program
unit.

 STRESS TEST:
 It those tests designed to intentionally break
the unit. A great deal can be learned about the strengths
and limitations of a program by examining the manner
in which a program unit breaks.
 STRUCTURE TEST:
 It concerned with exercising the internal
logic of a program and traversing particular execution
paths.

 This can be seen by examining the program segment .
N P
0 2
1 4
2 8
10 2048
P =2N+ 1

 Debugging is the process of isolating and correcting
the causes of known errors. Success at debugging
requires highly developed problem-solving skills.
Commonly used debugging methods include :
induction,
deduction,
 backtracking (BR073, MYE79).

 Debugging by induction involves the
following steps:
1. Collect the available information.
2. Look for patterns.
3. Form one or more hypotheses
4. Prove or disprove each hypothesis.
5. Implement the appropriate corrections
6. Verify the correction.

 Debugging by deduction proceeds as follows:
1. List possible causes for the observed failure.
2. Use the available information to eliminate
various hypotheses.
3. Elaborate the remaining hypotheses.
4. Prove or disprove each hypothesis.
5. Determine the appropriate corrections.
6. Verify the corrections.

 Debugging by backtracking:
It involves working backward in the
source code from the point where the error was
observed in an attempt to identify the exact point where
the error occurred.
 Traditional debugging:
This techniques utilize diagnostic output
statements, snap-shot dumps, selective traces on data
values and control flow, and instruction-dependent
breakpoints. Modern debugging tools utilize assertion-
controlled breakpoints and execution histories.

unit testing and debugging

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