refactor(web): move component tests into sibling __tests__ directories

[CodingOnStar]

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Summary

refactor(web): move component tests into sibling tests directories

Checklist

• This change requires a documentation update, included: Dify Document
• I understand that this PR may be closed in case there was no previous discussion or issues. (This doesn't apply to typos!)
• I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
• I've updated the documentation accordingly.
• I ran make lint and make type-check (backend) and cd web && npx lint-staged (frontend) to appease the lint gods

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on reorganizing the test files within the web application. It moves component-level tests into __tests__ directories located in the same directory as the component source files. This change enhances project structure and test discoverability, aligning with best practices for maintainable testing strategies.

Highlights

• Test File Restructuring: This PR refactors the web application's test suite by moving component tests into sibling __tests__ directories.
• Updated Documentation: The documentation has been updated to reflect the new test file placement strategy.
• Codebase Consistency: This change aims to improve the organization and maintainability of the codebase by enforcing a consistent test file structure.

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[Copilot]

Pull request overview

This PR standardizes the web frontend’s unit test layout by moving component/hook/utility tests into sibling __tests__/ directories and updating docs and imports to match the new structure.

Changes:

• Updated testing documentation/guidance to require sibling __tests__/ directories for component/hook/utility tests.
• Adjusted many test imports/mocks to account for tests now living under __tests__/.
• Added a new unit test suite for the Array.prototype.toSpliced polyfill behavior.

Reviewed changes

Copilot reviewed 37 out of 38 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
web/docs/test.md	Updates test placement/naming guidance to use sibling __tests__/ directories.
web/app/components/tools/workflow-tool/tests/utils.test.ts	Fixes relative imports after moving tests under __tests__/.
web/app/components/rag-pipeline/components/tests/index.spec.tsx	Tweaks act() usage around event callbacks to align with RTL expectations.
web/app/components/plugins/tests/use-plugins-with-latest-version.spec.ts	Updates imports to reflect new __tests__/ placement.
web/app/components/header/account-setting/model-provider-page/provider-added-card/model-auth-dropdown/tests/use-activate-credential.spec.tsx	Updates imports/mocks due to __tests__/ directory relocation.
web/app/components/header/account-setting/model-provider-page/provider-added-card/model-auth-dropdown/tests/usage-priority-section.spec.tsx	Updates imports due to __tests__/ directory relocation.
web/app/components/header/account-setting/model-provider-page/provider-added-card/model-auth-dropdown/tests/index.spec.tsx	Updates imports/mocks due to __tests__/ directory relocation.
web/app/components/header/account-setting/model-provider-page/provider-added-card/model-auth-dropdown/tests/dropdown-content.spec.tsx	Updates imports/mocks due to __tests__/ directory relocation.
web/app/components/header/account-setting/model-provider-page/provider-added-card/model-auth-dropdown/tests/dialog.spec.tsx	Updates imports/mocks due to __tests__/ directory relocation.
web/app/components/header/account-setting/model-provider-page/provider-added-card/model-auth-dropdown/tests/credits-exhausted-alert.spec.tsx	Updates imports/mocks due to __tests__/ directory relocation.
web/app/components/header/account-setting/model-provider-page/provider-added-card/model-auth-dropdown/tests/api-key-section.spec.tsx	Updates imports due to __tests__/ directory relocation.
web/app/components/header/account-setting/model-provider-page/provider-added-card/tests/use-trial-credits.spec.ts	Updates imports due to __tests__/ directory relocation.
web/app/components/header/account-setting/model-provider-page/provider-added-card/tests/use-credential-panel-state.spec.ts	Updates imports/mocks due to __tests__/ directory relocation.
web/app/components/header/account-setting/model-provider-page/provider-added-card/tests/use-change-provider-priority.spec.ts	Updates imports/mocks due to __tests__/ directory relocation.
web/app/components/header/account-setting/model-provider-page/provider-added-card/tests/system-quota-card.spec.tsx	Updates imports due to __tests__/ directory relocation.
web/app/components/header/account-setting/model-provider-page/provider-added-card/tests/provider-card-actions.spec.tsx	Updates imports due to __tests__/ directory relocation.
web/app/components/header/account-setting/model-provider-page/model-selector/tests/popover.spec.tsx	Updates imports/mocks due to __tests__/ directory relocation.
web/app/components/header/account-setting/model-provider-page/model-selector/tests/model-selector-trigger.spec.tsx	Updates imports/mocks due to __tests__/ directory relocation.
web/app/components/header/account-setting/model-provider-page/model-parameter-modal/tests/parameter-item.select.spec.tsx	Updates imports/mocks due to __tests__/ directory relocation.
web/app/components/header/account-setting/model-provider-page/model-parameter-modal/tests/derive-trigger-status.spec.ts	Updates imports due to __tests__/ directory relocation.
web/app/components/header/account-setting/model-provider-page/model-modal/tests/dialog.spec.tsx	Updates imports/mocks due to __tests__/ directory relocation.
web/app/components/header/account-setting/model-provider-page/tests/supports-credits.spec.ts	Updates imports due to __tests__/ directory relocation.
web/app/components/header/account-setting/model-provider-page/tests/index.non-cloud.spec.tsx	Updates imports/mocks due to __tests__/ directory relocation.
web/app/components/header/account-setting/model-provider-page/tests/derive-model-status.spec.ts	Updates imports due to __tests__/ directory relocation.
web/app/components/header/account-setting/model-provider-page/tests/atoms.spec.tsx	Updates imports due to __tests__/ directory relocation.
web/app/components/header/account-setting/members-page/edit-workspace-modal/tests/dialog.spec.tsx	Updates imports due to __tests__/ directory relocation.
web/app/components/header/account-setting/tests/menu-dialog.dialog.spec.tsx	Updates imports due to __tests__/ directory relocation.
web/app/components/base/prompt-editor/plugins/workflow-variable-block/tests/use-llm-model-plugin-installed.spec.ts	Updates imports due to __tests__/ directory relocation.
web/app/components/base/markdown-with-directive/components/tests/with-icon-card-list.spec.tsx	Updates imports due to __tests__/ directory relocation.
web/app/components/base/markdown-with-directive/components/tests/with-icon-card-item.spec.tsx	Updates imports due to __tests__/ directory relocation.
web/app/components/base/markdown-with-directive/components/tests/markdown-with-directive-schema.spec.ts	Updates imports due to __tests__/ directory relocation.
web/app/components/base/markdown-with-directive/tests/index.spec.tsx	Updates imports due to __tests__/ directory relocation.
web/app/components/base/file-uploader/tests/dynamic-pdf-preview.spec.tsx	Updates imports (including dynamic import) due to __tests__/ directory relocation.
web/app/components/base/amplitude/tests/utils.spec.ts	Updates imports/mocks due to __tests__/ directory relocation.
web/app/components/base/amplitude/tests/index.spec.ts	Updates imports due to __tests__/ directory relocation.
web/app/components/base/amplitude/tests/AmplitudeProvider.spec.tsx	Updates imports due to __tests__/ directory relocation.
web/app/components/tests/browser-initializer.spec.ts	Adds tests for toSpliced polyfill behavior.
.agents/skills/frontend-testing/SKILL.md	Updates agent testing skill doc to reflect sibling __tests__/ convention.

Comments suppressed due to low confidence (1)

web/app/components/tools/workflow-tool/tests/utils.test.ts:3

• This file is named utils.test.ts while the surrounding sibling tests use the *.spec.ts(x) convention and the updated test guidelines in this PR also specify *.spec.*. To keep naming consistent and make test discovery predictable, rename this file to utils.spec.ts (and update any references if needed).

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[gemini-code-assist]

Code Review

This pull request refactors the test file structure by moving component tests into __tests__ subdirectories, co-locating them with their corresponding components. The changes primarily consist of moving files and updating import paths. The path changes appear correct across the numerous files. Additionally, the tests in web/app/components/rag-pipeline/components/__tests__/index.spec.tsx have been improved by correctly wrapping asynchronous updates in act, which should enhance test stability. Overall, this is a structural refactoring that improves test organization.