What is Unit Testing, Integration, UI Testing & Benefits
Summary
TLDRThis video delves into the importance of testing in app development, highlighting the inefficiency of manual testing and the benefits of automated testing, such as saving time, ensuring code reliability, and providing a source of truth for business logic. It introduces three types of tests: unit tests, which focus on small business logic pieces; integration tests, which combine unit tests to see how they work together; and UI tests, which cover the app's user interface and user flows. The video also mentions the use of the XCTest framework with asserts to validate test outcomes. Viewers are encouraged to stay tuned for upcoming videos that will explore writing these tests to enhance code reliability.
Takeaways
- 🔍 The purpose of testing code is to ensure that it functions correctly and to identify any issues that may arise from changes made to the application.
- 🕒 Manual testing of an entire app can be time-consuming and may lead to missed test cases or paths, which can be avoided with automated testing.
- 🛠 Automated testing helps save time by allowing developers to alter their work efficiently and verify its correctness.
- 🔒 Automated tests provide confidence in the code by ensuring that changes have not broken existing functionality.
- 📝 Tests serve as documentation, offering a source of truth for the business logic implemented in the application.
- 🧩 There are three main types of tests: unit tests, integration tests, and UI tests, each serving different aspects of the application's functionality.
- 🔬 Unit tests focus on a small piece of business logic within the app, such as properties in a view model that indicate loading states.
- 🔄 Integration tests combine different unit test modules to see how they work together as a larger system, ensuring that interactions between components are correct.
- 🖥️ UI tests involve testing the user interface of the app, including flows and interactions, such as button states when fetching data.
- 📐 XCTest is a framework that can be used to write these tests, utilizing asserts to check if outcomes match expected values.
- 🚦 Asserts are statements used in unit tests to validate that the actual result matches the expected result, determining if the test passes or fails.
Q & A
What is the main purpose of testing code in app development?
-The main purpose of testing code in app development is to ensure that the code works as expected, save time by automating the testing process, and maintain confidence in the code by verifying that changes do not break existing functionality.
Why is manual testing of an entire app impractical when making changes?
-Manual testing is impractical because it is time-consuming, as testers have to retest every journey and workflow, and it is also prone to missing some case paths, making it difficult to see how changes affect the existing code.
What are the three types of tests mentioned in the script?
-The three types of tests mentioned are unit tests, integration tests, and UI tests.
What is a unit test and what does it test?
-A unit test is a test that focuses on a small piece of business logic within an app, such as properties in a view model that indicate whether the view is loading or fetching.
How do integration tests differ from unit tests?
-Integration tests combine different unit test modules to see how they work together in a larger context, ensuring that different parts of the application interact properly.
What does UI testing involve and why is it important?
-UI testing involves testing the user interface within an app, including testing flows and interactions such as data fetching and button states. It is important to ensure a seamless and intuitive user experience.
What is the role of the XCTest framework in writing tests?
-The XCTest framework provides a set of tools and assertions that help in writing unit, integration, and UI tests, allowing developers to check if the outcomes match the expected results.
What does it mean to assert a value in a unit test?
-Asserting a value in a unit test means checking to see if the actual outcome of a piece of code matches the expected outcome. If the values match, the test passes; if not, the test fails.
Why are tests considered a source of truth for business logic?
-Tests serve as a source of truth for business logic because they provide a documented and automated way to verify that the logic behaves as intended, reducing the risk of human error and ensuring consistency.
What benefits can be expected from writing tests for code?
-Writing tests for code can provide benefits such as saving time by automating the testing process, increasing confidence in the code by ensuring existing functionality is not broken, and providing documentation for the business logic.
What will be covered in the upcoming videos of the course mentioned in the script?
-The upcoming videos in the course will cover different types of tests and how to write them effectively to make the code more reliable.
Outlines
🔍 Introduction to Testing in App Development
This paragraph introduces the concept of testing in app development, emphasizing the importance of ensuring code functionality. The speaker highlights the inefficiency and potential for error in manual testing, especially with changes in the application. It also outlines the benefits of using automated tests, such as saving time, maintaining confidence in the code by not breaking existing functionalities, and providing documentation as a source of truth for business logic. The paragraph sets the stage for discussing three types of tests: unit tests, integration tests, and UI tests, which will be detailed in subsequent videos.
Mindmap
Keywords
💡Unit Testing
💡Integration Testing
💡UI Testing
💡Testing
💡Asserts
💡XCTest
💡Business Logic
💡Manual Testing
💡Workflow
💡Source of Truth
💡Reliability
Highlights
Introduction to the importance of testing code in app development to ensure functionality and address issues with manual testing.
Manual testing is time-consuming and can miss certain case paths, making it inefficient.
Testing helps save time by automating the verification of changes in the code.
Confidence in code is achieved through testing to ensure existing code is not broken.
Tests provide documentation and a source of truth for business logic.
Three types of tests discussed: unit tests, integration tests, and UI tests.
Unit tests focus on small pieces of business logic within an application.
Integration tests combine different unit test modules to see how they work together.
UI tests are used to test the user interface and user flows within an app.
XCTest framework is introduced for writing tests with asserts.
Asserts are used to check if the outcome matches the expected value in a unit test.
Explanation of how asserts work with an example of checking if a number is even.
Upcoming videos will cover how to write different types of tests to improve code reliability.
Invitation for feedback in the comment section for further engagement.
Encouragement to like, subscribe, and enable notifications for new video updates.
Closing remarks and sign-off for the video.
Transcripts
hey and welcome back to another video
and in this video we're going to discuss
unit testing and integration tests as
well as UI test and the benefits so
what's the point of testing your code
well when you're building your apps you
need to make sure that your code
actually works now what you could do is
you could test your whole app manually
every time but when you make this change
this would actually come with a few
issues so let's say for example if youed
to make a change within your application
not only is this time consuming because
you're actually going to have to spend a
lot of time retesting every single
journey and every workflow and whatnot
it's also possible to miss some case
paths as well that you want to test and
you can't easily just see how changes
affect the existing code so we can solve
some of these common problems with test
and test allow us to make sure that we
can actually save time by alterating our
work and making sure that it's correct
we can also have confidence in our code
by making sure that we haven't broken
existing code and we can provide
document
since we now have a source of Truth for
our business logic so when you actually
write tests there's actually three types
of test that you could write and that is
a unit test or unit testing there's
integration test or integration testings
and also UI testing as well so what's
the difference between them well unit
test this is usually a small piece of
business logic within your app so what
do I mean by this so let's say we look
at our you know our view model that
we've been working on in the past couple
videos we actually have some properties
in there for telling us whether our view
is loading and is fetching and whatnot
this is business logic that we wrote
specifically within our application so
business logic is just basically a small
part of like some kind of
object now you have integration testing
and integration test actually combine
different unit test modules in to see
how they work together into a larger
test so an example of this is where we
actually have our validation object and
our create view model they actually both
interact with one another so when we
write an integration test we want to
make sure that our validation is
actually working properly before we try
to create a user and the final test that
we
have is our UI test and this is usually
the testing of the UI within our app so
with the UI testing we're able to test
our flows as well so a good example of
this is when we fetching data from you
know our service are our buttons
disabled so these are the different
types of test that we can have within
our app so in order to actually write
these tests we can actually use an XC
test so what does this mean well the xct
framework actually comes with something
called asserts and when you write a unit
test you actually need to assert a value
so what does it mean well in a nutshell
when you AER of value what you're
essentially doing is checking to see if
the outcome matches what you've provided
Ed so in this example that I've got on
the screen here we're actually asserting
to see if the number is even or not so
if it's true or false it will actually
depend on whether the unit test passes
or fails so in the upcoming videos in
this course we'll take a look at these
different types of tests and how we can
actually write them to help make our
code more reliable so that's everything
in this video if you enjoy this video
I'd love to hear your feedback in the
comment section below also as well if
you haven't already really appreciate it
if you gave this video a thumbs up as
well as subscribe to the channel and hit
notification Bell to get updates for
whenever I release a new video that's
everything from me I'll catch you on a
bit deuces
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