---
title: "Compute combined coverage for a test session"
method: POST
path: "/v1/test-sessions/{sessionId}/coverage"
tags: ["Testing"]
---

# Compute combined coverage for a test session

`POST /v1/test-sessions/{sessionId}/coverage`

## Request

- Base URL: `http://localhost:9998`
- URL: `http://localhost:9998/v1/test-sessions/{sessionId}/coverage`
- Auth: HTTP bearer

Combines PiperProbe element coverage with CDP JS/CSS code coverage.
Returns a weighted score (elements 60%, JS 30%, CSS 10%).

## Response `200`

Combined coverage result

- object
  - `elements` object
    - `total` integer
    - `covered` integer
    - `percentage` number
  - `js` object
    - `totalBytes` integer
    - `usedBytes` integer
    - `percentage` number
  - `css` object
    - `totalBytes` integer
    - `usedBytes` integer
    - `percentage` number
  - `combinedScore` number: Weighted score 0-100 (elements 60%, JS 30%, CSS 10%)

## Other responses

- `502`: Coverage collection failed

---

[API](https://skmtc.dev/modelpiper/apis/toolpiper-api.md) · [All operations](https://skmtc.dev/modelpiper/apis/toolpiper-api/llms.txt) · [OpenAPI document](https://skmtc.dev/modelpiper/apis/toolpiper-api/revisions/6722bf56385c?raw)