Lightning Testing Service is an amazing testing framework to test your Salesforce Lightning components. It is highly recommended to utilize the Lightning Testing service to ensure that your components are functioning as expected. LTS is a complete suite of tools and services that are integrated with Salesforce DX to make testing easier and faster.

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Introduction to Lightning Testing Service

2. What is a Lightning Test Service (LTS)?
Lightning Testing Service is an amazing testing
framework to test your Salesforce Lightning
components. It is highly recommended to utilize the
Lightning Testing service to ensure that your
components are functioning as expected. LTS is a
complete suite of tools and services that are
integrated with Salesforce DX to make testing
easier and faster.
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3. Key Features of LTS
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● LTS is supported by Jasmine and Mocha that are currently the two most popular client testing
frameworks.
● LTS can be used with Salesforce DX as well as non-Salesforce DX contexts.

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LTS simplifies the process of building test suites and is fully integrated with Salesforce DX.
LTS comprises of two main components:
Unmanaged LTS
packages that are listed
on the project Releases
page by the release
version.
LTS installation
command for the
Salesforce
Command Line
Interface (CLI).
How Lightning Testing Service Works?

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You need not install SalesforceDX to work with LTS. SalesforceDX
makes it easier for you to work with LTS. However, the most
important point behind using SalesforceDX is extremely similar to
why you need JavaScript testing.
Wrappers are ONLY supported for Jasmine and Mocha. If you
wish to use another testing framework, you may need to build
your own wrapper, which will most probably take about a day to
work.
Important things you need to know about working with LTS

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Do not install or use LTS in production. Yes, you read that absolutely right! This can be only for the
development environments and even better for scratch orgs that you can simply create using Salesforce
DX.
Data Manipulation Language operations you perform in your tests won’t be rolled back at the end of the
test. We recommend that you run your LTS test suites only in the development environments or
scratch orgs that you simply create using Salesforce DX and data provided by the test suite itself.
LTS includes sample code to help you get started. This includes not only the Jasmine and Mocha wrappers
but also a Lightning App called JasmineTest, which is an app that you can simply use to begin your testing.

7. Don't use LTS to check your server code. Keep your client and server-side testing separate.
When calling Apex server methods that insert records with LTS, the information that is
created will not be rolled back. You have to be solely responsible for rolling back the
information yourself.
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Important tips:

8. Thank You
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