static analysis and unit testing in SE.pptx

Static Analysis of Software
&
Unit Testing
Mrs.G.Chandraprabha., M.Sc., M.Phil.,
Assistant Professor of IT,
V.V.Vanniaperumal College for Women,
Virudhunagar.

Static Analysis-Introduction
 Static analysis involves a set of methods
used to analyse software source code or
object code.
 Static analysis studies the source code
without executing it and reveals a wide
variety of information such as the structure
of the model used, data and control flow,
syntax accuracy, and more.
 The different software static testing
techniques are called the review, and the
static analysis.

Static Analysis-Introduction
 The types of reviews can be given by a
simple diagram

Steps involved in Static Analysis
 Step 1 − The software static testing begins
with planning of the test objectives, scope,
and test strategy. It includes the
identification of modules to be verified, the
test methods, and the tools to be used.
 Step 2 − In this step, the different artifacts
like the test cases, requirement and design
documents, source code etc are prepared.
 Step 3 − The static analysis is done to verify
the code and to check if it is as per the
standards, quality, secure, and compliances
with the help of multiple tools and not by
running the code.

Steps involved in Static Analysis
 Step 4 − The code review is done with the
help of a small team of experts to find faults
in the code, and identify errors in any
methods used
 Step 5 − The defects detected at the static
testing are reported and documented.
 Step 6 − The report on the software static
testing is generated to assess the software
quality.

Advantages of Static Analysis
The advantages of the software static testing
are listed below −
 The software static testing helps in the early
identification of defects which can be resolved
very fast, with less effort, and cost.
 The software static testing detects common errors
namely syntax error, null pointer exception etc.
 The software static testing makes the code more
structured and maintainable. Thus it enhances the
code quality.

Advantages of Static Analysis
 The software static testing provides a quick
feedback to the software during all its
development stages.
 The software static testing determines the
actual location of the defects.

Disadvantages of Static Analysis
The disadvantages of the software static testing
are listed below −
 The software static testing does not detect
bugs which appear only at the runtime, for
example memory leaks, performance
problems etc.
 The software static testing can be more
productive only if the reviewer is
experienced, and has the correct knowledge,
and skills.

Disadvantages of Static Analysis
 The software static testing takes time for
large and complicated projects.
 The software static testing is dependent on
human intervention as it is performed with
the help of the manual reviews and
inspections.

Tools to perform Static Analysis
 The different tools used for the software
static testing are listed below −
 Checkstyle
 Soot
 SourceMeter
 Lint
 SonarQube

Unit Testing-Introduction
 Unit testing of the software is conducted by
the developers.
 It is done at early stages of the software
development process when each of the
software units are not yet integrated.
 This is the first stage of functional testing of
the software.
 The unit test cases may be executed
manually or through automation.

Unit Testing-Introduction
 The correctness of each isolated unit
developed - function, method etc are
verified.
 The unit testing is done to identify defects at
the early stages of software development life
cycle (SDLC) to improve the software quality
and have a quicker fix for the defects.
 Each unit of software is tested independently
by the developers.

Unit Testing-Prerequisites
 In unit testing, individual software units
consisting of methods, functions, procedures
etc are tested to check if they are working
as expected.
 An individual unit is validated independently
by the developer himself while he is actually
working on it.
 A separate software component can be a
specific method, function, procedure, block
of code etc.

Unit Testing-Prerequisites
 Once the unit testing has been completed, it
moves to the integration testing phase.
 Thus, unit testing is helpful in understanding
software code, and fixing loopholes.
 The unit test cases consist of the below
steps −
 Design Test Cases
 Review Test Cases
 Baseline Test Cases
 Run Test Cases

Types of Unit Testing
 Black Box Testing-In black box testing
technique, testers are unaware of the
internal logic of software, and are only
concerned with data input to software and
its output.
 White Box Testing-In white box testing
technique, testers verify all the software
functionalities along with the internal code.
 Gray Box Testing-The gray box testing is a
combination of both black and white box
testing.

Advantages of Unit Testing
 Unit testing helps the developers to improve
the code and make each software
component work properly.
 It allows testing of independent clusters of
the software without depending on other
clusters.
 It allows early detection of defects in the
initial stages of SDLC, and to fix them
quickly.
 It helps the developers to build confidence
on the code they developed by enhancing its
quality.

Advantages of Unit Testing
 Unit testing helps to resolve the defects
faster without requiring to wait for the
development of all the modules of the
software.
 It assists the developers to refactor the code
safely without breaking the existing
functionalities.
 Unit testing saves a lot of time and
resources as fixing defects at the early
stages of SDLC is easier and faster than at
the later stages.

Disadvantages of Unit Testing
 It requires time to develop and maintain test
cases for unit testing and modify them as
the requirements change.
 It only identifies defects on individual units
of the software and not on the integration of
the units.
 It cannot detect errors in the user interface
of the software.
 Unit testing does not include non-functional
requirements of the software such as
scalability, security, reliability,
responsiveness, usability etc.

Disadvantages of Unit Testing
 The quality of the unit testing depends solely
on how well the unit test cases are written
by the developers.
 The developers face problems performing
unit testing on complex applications as it is
difficult to segregate their individual
components and verify them.
 Unit testing does not involve testing of all
the execution paths within the tested
module.

static analysis and unit testing in SE.pptx

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