I downloaded latest version of PhpED (eval). My paid version does not have latest phpunit (8.4.3).
I tried to make a test, but nothing works.
In other IDE was very simple with composer.

Is there a phpunit tutorial?
Thanks in advance.

http://www.nusphere.com/products/php_testing_phpunit.htm
http://www.nusphere.com/products/php_code_coverage.htm

I get this error:
Fatal error: Class 'PHPUnit\Framework\TestCase' not found in D:\unit\test\testEmail.php on line 6

The tutorial is so useless.
PEAR is deprecated and it is not used anymore.

You can ignore that part related to PEAR, as it's indeed not used anymore.
As of the missed class, you can not run your test scripts directly.
You have to open Test Suite window (F6) and run your tests from it.
If it fails too, you have to go through the Project Settings Wizard.

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what's about "Checking php installation in CLI (console) mode" page? Did it find any errors?
what's about phpUnit version it detected?

I have no idea.
PhpED generates php files.
Then It says PHPUnit_Framework_TestCase is not found.
At this point PhpED deletes all generated files.

That's all.

Funny. You showed one page and don't wont to show another. What's the reason?
and no, I didn't ask anything about how PhpED works.

Don't worry. English is not my strength.
I'll make a video to all installation process.
I am just a little tired trying to see how phpunit 8.3.4 works in PhpED.

By the way! I am a newbie to phpunit. Now I try to learn it.

It's very unclear what you're doing.
In the beginning you posted "I get this error: Fatal error: Class 'PHPUnit\Framework\TestCase' not found in D:\unit\test\testEmail.php on line 6"
A few hours later you posted a screenshot showing very different error occurred at a very different line in a very different file located on a different disk.
I asked for screenshot of php test results but you didn't understand me.

I know it is unclear, because I never worked with phpunit. I want to learn it.
First I need to learn to install it.

https://youtu.be/-kMSjHMBuRo