ISTQB FOUNDATION 4.0 | Tutorial 36 | Value of White Box Test Techniques | CTFL Tutorials | TM SQUARE
Summary
TLDRThis tutorial delves into the value of white box testing techniques at the ISTQB Foundation level. It clarifies misconceptions that white box testing is limited to unit testing, emphasizing its broader application in non-functional testing like performance, security, and API tests. The tutorial highlights the strength of white box testing in detecting defects when software specifications are outdated or incomplete, and its dependency on code understanding. It also discusses the technique's limitations and its role in static testing, advocating for a blend of black box and white box testing for comprehensive code coverage and confidence.
Takeaways
- 📚 White box testing techniques are valuable for overall project testing success, not just limited to unit testing or development.
- 🔍 They are particularly useful when software specifications are outdated or incomplete, allowing for defect detection despite unclear requirements.
- 👨💻 White box testing is dependent on code and requires programming knowledge for effective application.
- 🚫 A weakness is that if software lacks implementation of certain requirements, white box testing may fail to detect the resulting defects.
- 🔄 White box testing can be applied to non-functional tests such as performance, security, and API tests, in addition to functional testing.
- 🔄 It is also applicable in areas like interoperability, portability, and recoverability, expanding its scope beyond basic testing.
- 📈 White box coverage measures provide an objective way to assess code coverage, aiding in generating additional tests to increase confidence.
- 🔄 White box testing complements black box testing, offering a blend of behavior and structural coverage for comprehensive testing.
- 📝 It is used in static testing, suitable for reviewing code before execution, pseudo codes, and high-level logic that can be modeled with control flow graphs.
- 🤖 Black box testing is more concept-driven and lacks the precision of white box testing in terms of statement and decision coverage.
- 🌟 The tutorial emphasizes the importance of understanding both white box and black box testing to maximize the value they add to the testing process.
Q & A
What is the main topic of this tutorial?
-The main topic of this tutorial is white box test techniques, specifically their value and application in the context of ISTQB Foundation level certification.
Why are white box test techniques important for non-technical tests like performance, security, and API tests?
-White box test techniques are important for non-technical tests because they allow for a deeper analysis of the software's internal workings, which is crucial for identifying issues in areas like performance, security, and API functionality.
What is one of the fundamental strengths of white box testing mentioned in the script?
-One of the fundamental strengths of white box testing is that it takes the entire software implementation into account during testing, facilitating defect detection even when the software specification is outdated or incomplete.
How can white box testing be beneficial when software requirements are unclear or incomplete?
-White box testing can be beneficial in such cases because it allows testers to execute required test cases based on the software's code, rather than relying solely on the possibly unclear or incomplete requirements.
What is a potential weakness of white box testing when the software does not implement one or more requirements?
-A potential weakness is that white box testing may not detect the resulting defects of omissions if the software does not implement one or more requirements, as it is dependent on the existing code.
How does white box testing relate to static testing?
-White box testing can be used in static testing, where it is applied to review code that is not yet ready for execution, as well as pseudo codes and high-level logic that can be modeled with a control flow graph.
Why is it necessary to combine black box and white box testing for optimal coverage?
-Combining black box and white box testing is necessary to achieve optimal coverage because black box testing provides a measure of the software's behavior, while white box testing offers insights into the software's structure, ensuring a comprehensive evaluation.
What does white box coverage measure provide that black box testing does not?
-White box coverage measures provide an objective measurement of coverage, allowing for the generation of additional tests to increase coverage and subsequently increase confidence in the code, which is not possible with black box testing alone.
How does white box testing differ from black box testing in terms of precision and accuracy?
-White box testing is more precise and accurate in terms of covering statements and decisions within the code, providing a higher level of confidence compared to black box testing, which is more concept-driven and less precise in measuring coverage.
What is the tutorial's stance on the importance of white box testing compared to black box testing?
-The tutorial emphasizes that white box testing is not more important than black box testing, but rather that it can equally add significant value when testing a system, suggesting a balanced approach to both testing methodologies.
What is the final message from the tutorial team to the viewers?
-The final message from the tutorial team is to encourage viewers to keep learning, exploring, and understanding the context of software testing, and to feel free to comment with any queries for further assistance.
Outlines
🔍 Value and Scope of White Box Testing Techniques
This paragraph introduces the topic of white box testing techniques within the context of ISTQB Foundation level certification, focusing on chapter 4 about test analysis and design. The speaker clarifies that white box testing is not limited to unit testing but also plays a crucial role in non-functional testing areas such as performance, security, and API tests. The paragraph emphasizes the importance of white box testing when software specifications are outdated or incomplete, highlighting its strength in defect detection. It also points out the dependency of white box testing on the code and the potential limitation when functionalities are not yet implemented. The speaker mentions the application of white box testing in static testing, including dry runs of code and reviewing pseudo codes, and the importance of combining white box with black box testing for comprehensive coverage.
📏 Precision and Limitations of White Box Testing
The second paragraph delves deeper into the precision of white box testing, contrasting it with black box testing. It explains that while black box testing is more concept-driven and may lack precise coverage measurement, white box testing can provide accurate coverage of statements and decisions, thus increasing confidence in the testing process. The speaker also discusses the limitations of black box testing in terms of not providing a measure of actual code coverage and the need to blend both testing approaches for optimal results. The paragraph concludes with an invitation for viewers to engage with the content by asking questions and a motivational note to continue learning and exploring.
Mindmap
Keywords
💡ISTQB Foundation Level Certification
💡Test Analysis and Design
💡White Box Testing Techniques
💡Value
💡Non-technical Tests
💡API Tests
💡Interoperability
💡Portability
💡Recoverability
💡Static Testing
💡Code Coverage
💡Black Box Testing
Highlights
Introduction to Chapter 4 on test analysis and design in ISTQB Foundation level certification.
Exploring the value of white box test techniques in contributing to the success of overall project testing.
Dispelling the myth that white box testing is limited to unit testing and development.
White box testing's applicability in non-technical tests such as performance, security, and API tests.
The potential of white box testing in areas like interoperability, portability, and recoverability.
White box testing's fundamental strength in considering the entire software implementation for defect detection.
The advantage of white box testing when software specifications are outdated or incomplete.
Weakness of white box testing when software does not implement one or more requirements.
Dependency of white box testing on code and the tester's programming knowledge.
White box testing techniques' utility in static testing, including dry runs and reviewing pseudocode.
The limitation of black box testing in providing a measure of actual code coverage.
Combining black box and white box testing for comprehensive code coverage.
White box coverage measures providing objective information for generating additional tests.
The precision of white box testing in covering statements and decisions for increased confidence.
The importance of not discriminating between white box and black box testing, as both add value.
Encouragement to keep learning, exploring, and understanding the context of testing techniques.
Transcripts
Hello friends and greetings for the day
welcome back to another tutorial on
istqb Foundation level certification we
are in chapter 4 talking about test
analysis and design and continuing ahead
with our same segment that is 4.3 white
box test techniques and as a part of
this tutorial today which is a pretty
short tutorial we'll be talking about
what is the value of white box test
techniques
as a part of this particular tutorial
we'll be trying to understand how white
box testing techniques can contribute to
the major success of the overall project
testing however most of us get under
that impression and illusion that white
box test techniques are only limited to
unit testing or to the development part
which is of course unit testing
altogether but when it comes to the
non-technical tests or nonfunctional
testing we certainly have a lot of level
like performance security and and many
other API tests which are being
conducted we certainly look forward to
have a lot of white block testing being
conducted indeed not only that if we
jump on to M multiple other things like
interoperability the portability
recoverability and so on we will have a
lot of scope of white box test
techniques to be applied indeed there
are many other techniques but at this
point we just want to keep it as a
context because uh this is more at the
blackbox level of testing certification
so we will just give you quick outset of
what exactly white box testing value can
be which can be added further to the
overall industry practices so to talk
about this of course we are talking
about the value of white box testing and
the very first point to talk here is to
talk about it is one of the fundamental
strength of the white box test technique
is that the entire software
implementation is taken into account
during testing which facilitates the
defect detection even when the software
specification is Wake outdated or
incomplete the most important benefit of
having white box testing techniques in
place is that when your requirements are
not clear or incomplete or not so
detailed that the blackbox test
techniques can be applied then white box
testing can really help us to do the
required test cases execution at the
same time these are generally applicable
when the requirements are not up to the
mark however on the at the same time we
cannot ignore the weaknesses of this
particular category and we say that a
corresponding weakness is that if the
software does not Implement one or more
requirements white box testing may not
detect the resulting defects of
omissions so it's more of like if the
functional functionalities are not yet
implemented then it might be very
difficult to find a particular defect
related to that so in a nutshell all it
means that white box test techniques are
dependent on code so given that you have
a PR programming knowledge you have some
fundamental understanding of what is
code you can go ahead and apply these
techniques and this will be very useful
when the requirements are not detailed
but at the same time if requirements are
not detailed and the implementation has
not yet taken place or some of the
functionalities are yet to be
implemented then white box testing
techniques can be a limitation further
to add here of course white box test
techniques can be used in static testing
which we have covered in entire chapter
3 and here which is a approach uh it is
used as a part of the approaches like
dry runs of the code and they they are
well suited to reviewing the code that
is not yet ready for execution as well
as pseudo codes and other high level are
top down logic which can be modeled with
a control flow graph so however we got
an Insight already with help of our
techniques that it does need a pictorial
representation of what we have been
doing in order to derive the number of
test cases so it will certainly make use
of this and static testing is more about
statically reviewing the work products
so the work product can be a code can be
a algorithm can be a flowchart so it
would be very useful to derive minimum
number of test cases to do these
executions or perform the static testing
of the code itself also to add here
performing only blackbox testing does
not provide a measure of actual code
coverage which means the blackbox
testing would be just limited from the
behavior point of view but not the
structural point of view so however we
need to do a top up of or blend off the
black box and white box together so that
we can have the best coverage possible
on a given functionality from the
behavior as well as from the technical
side of it also to add white box
coverage measures provide an objective
measurement of coverage and provide the
necessary information to allow
additional test to be generated to
increase this coverage and subsequently
increase confidence in the code so
blackbox sing is More Concept driven so
if you see there are conditions and we
limit in such a way that we cannot be
very very precise that what percentage
of coverage we have achieved however for
example equivalence partition we can
take one test per partition but we do
understand at an outset that something
is still not giving us that level of
confidence but when it comes to white
box it's very precise very accurate in
terms of covering the statements and
decisions so we can be very much
confident compared to that of the
blackbox however this is not to
discriminate that white box testing is
more important than black boox testing
it is just to let people know that white
box can equally add a lot of value when
it comes to testing a system so keeping
it short and to the point that's all
from this particular tutorial team
should you have anything else feel free
to comment below I'm always there to
address your queries and answer them
well till then keep learning keep
exploring keep understand the context
thanks for watching the video team and
happy
learning
[Music]
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