chore: use testcontext for mock tests

[Uzlopak]

This relates to...

Rationale

Changes

Features

Bug Fixes

Breaking Changes and Deprecations

Status

• I have read and agreed to the Developer's Certificate of Origin
• Tested
• Benchmarked (optional)
• Documented
• Review ready
• In review
• Merge ready

[Copilot]

Pull Request Overview

This pull request modernizes the test framework by replacing the third-party tspl library with Node.js's built-in test context (testcontext). The change standardizes mock test assertions to use the native Node.js test API.

• Removes dependency on @matteo.collina/tspl library
• Updates all test assertions to use t.assert.* pattern instead of direct t.* calls
• Removes manual test planning and ending calls that are now handled automatically

Reviewed Changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
test/mock-utils.js	Converts tspl usage to native test assertions for mock utility functions
test/mock-scope.js	Updates MockScope test assertions to use t.assert API
test/mock-pool.js	Migrates MockPool tests from tspl to native Node.js test context
test/mock-interceptor.js	Converts MockInterceptor test assertions and removes manual test lifecycle management
test/mock-interceptor-unused-assertions.js	Updates pending interceptor assertion tests to use native API
test/mock-errors.js	Migrates mock error tests to use t.assert pattern
test/mock-client.js	Converts MockClient tests from tspl to native test assertions
test/mock-call-history.js	Updates call history test assertions and removes t.end() calls
test/mock-call-history-log.js	Migrates call history log tests to native Node.js test API
test/mock-agent.js	Large conversion of MockAgent tests from tspl to t.assert pattern

Comments suppressed due to low confidence (1)

test/mock-agent.js:1

• Missing await keyword before t.assert.rejects call. This should be await t.assert.rejects(...) to properly handle the async assertion.

'use strict'

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}