feat: add VirtualListTester

[joelpop]

Description

Added VirtualListTester to enable VirtualLists to be unit tested with TestBench.

As this tester and GridTester both support LitRenderers, the common code from GridTester was extracted to an interface HasLitRenderer so it could be shared by both testers.

Because a VirtualList is used to display a large list of rows, for its testing Instancio was added as a test dependency to the project to facilitate randomized generation of values.

Fixes #1721

Type of change

• Bugfix
• Feature

Checklist

• I have read the contribution guide: https://vaadin.com/docs/latest/guide/contributing/overview/
• I have added a description following the guideline.
• The issue is created in the corresponding repository and I have referenced it.
• I have added tests to ensure my change is effective and works as intended.
• New and existing tests are passing locally with my change.
• I have performed self-review and corrected misspellings.

Additional for Feature type of change

• Enhancement / new feature was discussed in a corresponding GitHub issue and Acceptance Criteria were created.

[mcollovati]

Some change requests.
Also, locally VirtualListTesterTest.virtualList_verifyComponentRenderer is failing with IllegalState Span[#first-name, text='AFIOSVXE'] is not visible!

[ZheSun88]

Hi @joelpop and all,

Vaadin 24.4 RC release is scheduled on this week Wednesday. Can we make sure that this PR will be merged before that?

Thanks.

[joelpop]

Hi @joelpop and all,

Vaadin 24.4 RC release is scheduled on this week Wednesday. Can we make sure that this PR will be merged before that?

Thanks.

I will do my best. I have fixed and resolved most of the issues I knew about and that @mcollovati requested. I have just one item left.

[ZheSun88]

if the PR is ready, remember to mark it ready for review (it is still a draft at the moment.)

[joelpop]

if the PR is ready, remember to mark it ready for review (it is still a draft at the moment.)

Yes, it is still draft pending one outstanding implementation question.

[joelpop]

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Some change requests. Also, locally VirtualListTesterTest.virtualList_verifyComponentRenderer is failing with IllegalState Span[#first-name, text='AFIOSVXE'] is not visible!

Yes, this is why I had left the PR as draft. The reason this test was failing is because ComponentRenderer test methods in both GridTester and VirtualListTester return a copy of the component–not the actual rendered component, so if you then attempt to use that component's tester, you get that "not visible" error.

[ZheSun88]

build failed with Vaadin Testbench UI Unit Test Shared module

 Failed to execute goal org.jetbrains.dokka:dokka-maven-plugin:1.6.21:javadoc (default) on project vaadin-testbench-unit-shared: A type incompatibility occurred while executing org.jetbrains.dokka:dokka-maven-plugin:1.6.21:javadoc: class com.intellij.psi.impl.source.PsiImmediateClassType cannot be cast to class com.intellij.psi.impl.source.PsiClassReferenceType (com.intellij.psi.impl.source.PsiImmediateClassType and com.intellij.psi.impl.source.PsiClassReferenceType are in unnamed module of loader java.net.URLClassLoader @4842598e)

found one related ticket from dokka plugin, from us.. Kotlin/dokka#2509
maybe we should upgrade the plugin version, the latest is 1.9.20

test in PR #1799

[ZheSun88]

validation failure has been resolved by upgrading the kotlin.version and dokka.version to 1.9.20

[mshabarov]

@ZheSun88 just for note, this isn't a blocker for Vaadin 24.4 release, this was planned specifically for 24.4. We can merge at any point.