test(linter/plugins): add tests for new Context methods

[overlookmotel]

Add test coverage for methods and getters on Context added in #15606 and #15632. I neglected to add tests in those PRs. Disgraceful.

[overlookmotel]

• test(linter/plugins): add tests for new Context methods #15656 👈 (View in Graphite)
• main

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[overlookmotel]

Merge activity

• Nov 12, 11:51 PM UTC: The merge label '0-merge' was detected. This PR will be added to the Graphite merge queue once it meets the requirements.
• Nov 12, 11:54 PM UTC: overlookmotel added this pull request to the Graphite merge queue.
• Nov 13, 12:01 AM UTC: Merged by the Graphite merge queue.

[Copilot]

Pull Request Overview

This PR adds comprehensive test coverage for new Context methods (getSourceCode(), getFilename(), getPhysicalFilename(), getCwd()) and the parserOptions getter that were previously added in #15606 and #15632 but lacked test coverage.

• Tests verify that getter methods return the same values as their property equivalents
• Tests confirm proper error handling when methods are called in inappropriate contexts (e.g., in createOnce)
• Snapshot files updated to reflect the additional test assertions

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
apps/oxlint/test/fixtures/sourceCode/plugin.ts	Adds assertion verifying getSourceCode() returns the same reference as sourceCode property
apps/oxlint/test/fixtures/languageOptions/plugin.ts	Adds assertion verifying parserOptions getter returns the same reference as languageOptions.parserOptions
apps/oxlint/test/fixtures/createOnce/plugin.ts	Adds comprehensive tests for getCwd(), getFilename(), getPhysicalFilename(), getSourceCode(), and parserOptions in createOnce context, verifying expected error behavior
apps/oxlint/test/fixtures/createOnce/output.snap.md	Updates snapshot to include 12 additional test outputs (6 per file) for new method/getter tests, incrementing error count from 46 to 58
apps/oxlint/test/fixtures/context_properties/plugin.ts	Consolidates context property tests into single report message and adds tests for getter methods getFilename(), getPhysicalFilename(), and getCwd()
apps/oxlint/test/fixtures/context_properties/output.snap.md	Updates snapshot with consolidated output format showing all context properties/methods in single report, reducing error count from 8 to 4

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