Add blog post: testing-in-2026-a-practical-guide.mdx#167
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📝 WalkthroughWalkthroughAdds a new MDX blog post with publication metadata, testing concepts, common pitfalls, best practices, TypeScript and React examples, and concluding guidance. ChangesTesting guide content
Estimated code review effort: 1 (Trivial) | ~2 minutes 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
Warning There were issues while running some tools. Please review the errors and either fix the tool's configuration or disable the tool if it's a critical failure. 🔧 ESLint
content/blog-post-2026-07-10/testing-in-2026-a-practical-guide.mdxParsing error: Invalid left-hand side in prefix operation. (1:2) Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out. Comment |
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Greptile SummaryThis PR adds a new MDX blog post about frontend testing. The main changes are:
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| Filename | Overview |
|---|---|
| content/blog-post-2026-07-10/testing-in-2026-a-practical-guide.mdx | Adds a new blog post, but its directory does not match the configured blog content path and one JSX example is labeled as TypeScript. |
Reviews (1): Last reviewed commit: "Add blog post: testing-in-2026-a-practic..." | Re-trigger Greptile
![greptile-apps[bot]](https://avatars.githubusercontent.com/in/867647?s=60&v=4){kind=small}
| @@ -0,0 +1,81 @@ | |||
| --- | |||
There was a problem hiding this comment.
This file is added under content/blog-post-2026-07-10/, while the blog collection only reads content/blog/**/*.mdx. With this path, the published post is not included in the generated content output, so it gets no blog route and does not appear in the listing.
| ```typescript | ||
| // Real-world application example | ||
| interface Props { | ||
| data: string[]; | ||
| onUpdate: (value: string) => void; | ||
| } | ||
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| function Component({ data, onUpdate }: Props) { | ||
| return ( | ||
| <div> | ||
| {data.map(item => ( | ||
| <button key={item} onClick={() => onUpdate(item)}> | ||
| {item} | ||
| </button> | ||
| ))} | ||
| </div> | ||
| ); | ||
| } | ||
| ``` |
There was a problem hiding this comment.
This code fence is labeled typescript, but the sample contains JSX tags and JSX expressions. When the post is rendered, the highlighter tokenizes it as plain TypeScript, which can produce confusing or incorrect highlighting for the example.
| ```typescript | |
| // Real-world application example | |
| interface Props { | |
| data: string[]; | |
| onUpdate: (value: string) => void; | |
| } | |
| function Component({ data, onUpdate }: Props) { | |
| return ( | |
| <div> | |
| {data.map(item => ( | |
| <button key={item} onClick={() => onUpdate(item)}> | |
| {item} | |
| </button> | |
| ))} | |
| </div> | |
| ); | |
| } | |
| ``` | |
| ```tsx | |
| // Real-world application example | |
| interface Props { | |
| data: string[]; | |
| onUpdate: (value: string) => void; | |
| } | |
| function Component({ data, onUpdate }: Props) { | |
| return ( | |
| <div> | |
| {data.map(item => ( | |
| <button key={item} onClick={() => onUpdate(item)}> | |
| {item} | |
| </button> | |
| ))} | |
| </div> | |
| ); | |
| } |
Note: If this suggestion doesn't match your team's coding style, reply to this and let me know. I'll remember it for next time!
![coderabbitai[bot]](https://avatars.githubusercontent.com/in/347564?s=60&v=4){kind=small}
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Actionable comments posted: 2
🤖 Prompt for all review comments with AI agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
Inline comments:
In `@content/blog-post-2026-07-10/testing-in-2026-a-practical-guide.mdx`:
- Around line 18-71: Replace the placeholder examples useModernPattern and
Component with runnable testing examples that include assertions, covering unit,
integration, E2E, accessibility, and CI workflows. Add concise guidance
explaining when each testing level is appropriate, and ensure the snippets use a
consistent real-world testing framework and can be adapted or executed by
readers.
- Around line 55-67: Update Component to render each item with a stable, unique
key instead of key={item}; add or derive a unique identifier for each data entry
and use it in the mapped button, or validate and deduplicate data before
rendering.
🪄 Autofix (Beta)
Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
ℹ️ Review info
⚙️ Run configuration
Configuration used: defaults
Review profile: CHILL
Plan: Pro
Run ID: e0b901b9-b4ec-4759-8fdd-6e4995d2cc7c
📒 Files selected for processing (1)
content/blog-post-2026-07-10/testing-in-2026-a-practical-guide.mdx
| ## Key Concepts | ||
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| ### 1. Foundation Principles | ||
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| The core principles behind testing remain consistent, but implementation details have evolved. Here's what you need to know: | ||
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| ```typescript | ||
| // Example of modern testing pattern | ||
| function useModernPattern() { | ||
| // Implementation example | ||
| return { | ||
| apply: () => { | ||
| console.log("Applying modern testing pattern"); | ||
| } | ||
| }; | ||
| } | ||
| ``` | ||
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| ### 2. Common Pitfalls to Avoid | ||
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| - **Ignoring performance**: Always measure before optimizing | ||
| - **Over-engineering**: Start simple, add complexity when needed | ||
| - **Not following conventions**: Stick to established patterns in your codebase | ||
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| ### 3. Best Practices | ||
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| 1. Start with the basics before moving to advanced patterns | ||
| 2. Test your implementations thoroughly | ||
| 3. Document your code for future reference | ||
| 4. Keep performance in mind throughout development | ||
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| ## Real-World Example | ||
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| Here's a practical example you can adapt for your projects: | ||
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| ```typescript | ||
| // Real-world application example | ||
| interface Props { | ||
| data: string[]; | ||
| onUpdate: (value: string) => void; | ||
| } | ||
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| function Component({ data, onUpdate }: Props) { | ||
| return ( | ||
| <div> | ||
| {data.map(item => ( | ||
| <button key={item} onClick={() => onUpdate(item)}> | ||
| {item} | ||
| </button> | ||
| ))} | ||
| </div> | ||
| ); | ||
| } | ||
| ``` |
There was a problem hiding this comment.
📐 Maintainability & Code Quality | 🟠 Major | 🏗️ Heavy lift
Add actual testing guidance and runnable test examples.
The article is presented as a practical testing guide, but its examples are production code: useModernPattern only logs, and Component is never tested. There are no assertions or concrete unit, integration, E2E, accessibility, or CI examples, so readers cannot apply the promised guidance. Replace the placeholders with runnable tests and explain when each testing level is appropriate.
This is based on the PR objective that this post provide a practical testing guide.
🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
In `@content/blog-post-2026-07-10/testing-in-2026-a-practical-guide.mdx` around
lines 18 - 71, Replace the placeholder examples useModernPattern and Component
with runnable testing examples that include assertions, covering unit,
integration, E2E, accessibility, and CI workflows. Add concise guidance
explaining when each testing level is appropriate, and ensure the snippets use a
consistent real-world testing framework and can be adapted or executed by
readers.
| interface Props { | ||
| data: string[]; | ||
| onUpdate: (value: string) => void; | ||
| } | ||
|
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||
| function Component({ data, onUpdate }: Props) { | ||
| return ( | ||
| <div> | ||
| {data.map(item => ( | ||
| <button key={item} onClick={() => onUpdate(item)}> | ||
| {item} | ||
| </button> | ||
| ))} |
There was a problem hiding this comment.
🎯 Functional Correctness | 🟡 Minor | ⚡ Quick win
🧩 Analysis chain
🏁 Script executed:
#!/bin/bash
set -euo pipefail
file="content/blog-post-2026-07-10/testing-in-2026-a-practical-guide.mdx"
echo "== file info =="
wc -l "$file"
echo
echo "== relevant excerpt =="
sed -n '1,140p' "$file"Repository: deepu0/frontend-junction
Length of output: 2813
Use stable, unique React keys. key={item} will collide if data contains duplicate strings, which can trigger React warnings and incorrect reconciliation. Prefer a unique id per item, or enforce uniqueness before rendering.
🤖 Prompt for AI Agents
Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.
In `@content/blog-post-2026-07-10/testing-in-2026-a-practical-guide.mdx` around
lines 55 - 67, Update Component to render each item with a stable, unique key
instead of key={item}; add or derive a unique identifier for each data entry and
use it in the mapped button, or validate and deduplicate data before rendering.
![codeant-ai[bot]](https://avatars.githubusercontent.com/in/646884?s=60&v=4){kind=small}
| --- | ||
| title: 'Testing in 2026: A Practical Guide' | ||
| description: 'A comprehensive guide to testing for modern frontend development in 2026.' | ||
| date: '2026-07-10' | ||
| tags: ['Testing', 'Frontend', '2026'] | ||
| published: true | ||
| image: './images/post-image.png' | ||
| --- |
There was a problem hiding this comment.
Suggestion: This post is placed under content/blog-post-2026-07-10/, but the content loader is configured to only index content/blog/**/*.mdx, so this article will never be collected or shown on the blog. Move this file under content/blog/ (or update the collection pattern) so it is actually published. [incomplete implementation]
Severity Level: Critical 🚨
❌ New testing article excluded from posts collection.
❌ Blog detail page never resolves this article.
❌ Static params generation omits slug for new post.
⚠️ Contributor guidance in CONTRIBUTING.md contradicts current placement.Steps of Reproduction ✅
1. Inspect the content loader configuration in `velite.config.ts:11-18`, where the `posts`
collection is defined with `pattern: 'blog/**/*.mdx'` and `root: 'content'`, meaning only
files under `content/blog/` matching that glob are indexed.
2. Compare this pattern with the new article path
`content/blog-post-2026-07-10/testing-in-2026-a-practical-guide.mdx` (from the PR diff and
confirmed via `content/` listing), noting that `blog-post-2026-07-10/` does not match the
`blog/**/*.mdx` glob, so Velite will not include this file in the `posts` collection.
3. Observe the blog detail route implementation in `app/blog/[...slug]/page.tsx:18-23` and
`71-73`, where `posts` from `#site/content` is searched via `getPostFromParams()` and used
to generate static params; since the new file is not in `posts`, no slug for this article
is added and it cannot be resolved at runtime.
4. Run the app (dev or build) and attempt to access the expected blog URL for this article
(e.g., under `/blog/...`), triggering `PostPage` in `app/blog/[...slug]/page.tsx:75-80`;
because the article is missing from `posts`, `post` is `undefined`, `notFound()` is
called, and the new article is never published or reachable from the blog.
(Use Cmd/Ctrl + Click for best experience)
Prompt for AI Agent 🤖
This is a comment left during a code review.
**Path:** content/blog-post-2026-07-10/testing-in-2026-a-practical-guide.mdx
**Line:** 1:8
**Comment:**
*Incomplete Implementation: This post is placed under `content/blog-post-2026-07-10/`, but the content loader is configured to only index `content/blog/**/*.mdx`, so this article will never be collected or shown on the blog. Move this file under `content/blog/` (or update the collection pattern) so it is actually published.
Validate the correctness of the flagged issue. If correct, How can I resolve this? If you propose a fix, implement it and please make it concise.
Once fix is implemented, also check other comments on the same PR, and ask user if the user wants to fix the rest of the comments as well. if said yes, then fetch all the comments validate the correctness and implement a minimal fix
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User description
Blog post about Testing for Frontend Junction
CodeAnt-AI Description
Add a new blog post about testing in 2026
What Changed
Impact
✅ New testing guidance for readers✅ Published frontend blog content✅ Clearer learning resource for modern testing💡 Usage Guide
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