KTOR-8549 and KTOR-7388 Server testing setup and accessing the application instance

[vnikolova]

KTOR-8549
KTOR-7388

• add new sections in server-testing for setup and accessing the application instance
• add a new test using the application property in a sample project
• add an entry in "What's new in Ktor 3.2.0"

[coderabbitai]

Walkthrough

Added a test asserting the Application instance inside a testApplication scope matches the configured instance. Rewrote and reorganized server-testing documentation, added guidance for accessing Application in tests, and inserted two duplicate whats-new entries demonstrating ApplicationTestBuilder.application usage.

Changes

Cohort / File(s)	Summary
Test addition codeSnippets/snippets/embedded-server-modules/src/test/kotlin/EmbeddedServerTest.kt	Added testAccessApplicationInstance() to capture the configured Application via the test builder, call startApplication(), retrieve the current application, and assert identity; added Application import.
Server testing docs (large rework) topics/server-testing.md	Extensive reorganization: replaced step lists with a holistic workflow, clarified dependencies (ktor-server-test-host, kotlin-test), added sections (configure-test-app, access-application, configure-client, make-request, assert), updated examples, code snippets, and lifecycle notes about startApplication.
Whats-new entries (duplicated) topics/whats-new-320.md	Inserted two identical sections (in different locations) showing ApplicationTestBuilder.application access with examples and notes comparing it to the previous nested application block approach.

Estimated code review effort

🎯 4 (Complex) | ⏱️ ~45 minutes

Suggested reviewers

• bjhham

Pre-merge checks and finishing touches

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	You can run @coderabbitai generate docstrings to improve docstring coverage.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description check	✅ Passed	The pull request description directly relates to the changeset, referencing specific JIRA issues and clearly outlining the three main changes made.
Title check	✅ Passed	The title directly relates to the main changes: it references both ticket numbers (KTOR-8549 and KTOR-7388), mentions server testing setup documentation, and specifically calls out accessing the application instance—all core focuses of the changeset across documentation and test code.

✨ Finishing touches

• 📝 Generate docstrings

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch vnikolova/KTOR-8549

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