> For the complete documentation index, see [llms.txt](https://docs.testvibe.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.testvibe.com/codebase.md).

# App Code

The **App Code** section — a top-level entry in the navigation rail — maps your connected source repository's files and app areas against which UI tests exercise them, so the parts of your app that nothing tests surface first.

{% hint style="info" %}
App Code was previously labeled **Codebase**. Old links and bookmarks to `/codebase` still work.
{% endhint %}

## Browse The Code

App Code reads your source repository like a GitHub code tab. Drill into folders with the breadcrumb, or jump straight to a file from the file-tree sidebar. Folders are listed A–Z by default; flip the **Gaps first** toggle to surface untested code at the top. Turn on **Only gaps** to hide everything except untested files, and use the search box to filter files across the whole tree.

## Per-File Coverage

Expand any file to see its **Tested by** panel — the features that map to it, each with its last-run pass or fail status and an Open link. Mapping comes from two sources: the AI's automatic file-to-area matching, and an explicit `@covers:` tag on a Gherkin scenario (for example `@covers:Services/CheckoutService`) that links that scenario straight to a source file — add a path qualifier when a bare class name matches more than one file in your repo, otherwise the tag is left unmapped rather than guessed. If a mapping is wrong, correct it inline: remove a stale link or map a test yourself. Your corrections are sticky and survive re-scans.

## Metrics And Trend

Each file and folder reports an executed-vs-tested rollup, and the hero shows an executed-lines trend as a sparkline so you can see coverage moving over time. Coverage runs collect real executed-line data for **.NET** (`dotnet test`) and **Node.js** (`node --test` / equivalent) projects; other stacks still get the structural files/areas/gaps mapping without an executed-lines number.

## Branches And New Code

Pick the branch to inspect. On a feature branch, App Code highlights files that are new in that branch and flags the new ones that nothing tests yet — so you catch missing coverage before you merge.

## How Areas Are Derived

An AI scan reads your source to detect the stack and infer route-grounded app areas (for example "Checkout" or "Login"), grounding them against URLs your app actually serves rather than guessing. Features are auto-mapped to those areas, and you can re-map by hand.

## Before You Start

App Code needs a connected source repository. Connect one under **Settings → App Repository**, then run a scan to populate files, areas, and coverage. Coverage-collection runs execute in TestVibe's cloud sandboxes, the same fleet that runs your Playwright tests.


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