[Code Coverage] Cobertura report missing <condition> elements

[flibustier7seas]

Describe the bug

When using vitest with the v8 provider and generating a Cobertura report, the resulting XML report does not include <condition> elements inside <line> entries. This causes issues with tools that rely on them for accurate merging of multiple coverage reports (e.g. dotnet-coverage).

Example: Cobertura report with <conditions>

Reproduction

<?xml version="1.0" ?>
<!DOCTYPE coverage SYSTEM "http://cobertura.sourceforge.net/xml/coverage-04.dtd">
<coverage lines-valid="22" lines-covered="10" line-rate="0.4545" branches-valid="8" branches-covered="4" branch-rate="0.5" timestamp="1749219797741" complexity="0" version="0.1">
  <sources>
    <source>C:/code-coverage__vitests/foo</source>
  </sources>
  <packages>
    <package name="main" line-rate="0.4545" branch-rate="0.5">
      <classes>
        <class name="get-quarter-name.ts" filename="src\get-quarter-name.ts" line-rate="0.625" branch-rate="0.5714">
          <methods>
            <method name="getQuarterName" hits="4" signature="()V">
              <lines>
                <line number="1" hits="4"/>
              </lines>
            </method>
          </methods>
          <lines>
            <line number="1" hits="1" branch="true" condition-coverage="100% (1/1)"/>
            <line number="2" hits="4" branch="false"/>
            <line number="4" hits="4" branch="true" condition-coverage="100% (1/1)"/>
            <line number="5" hits="2" branch="false"/>
            <line number="6" hits="2" branch="false"/>
            <line number="8" hits="4" branch="true" condition-coverage="0% (0/1)"/>
            <line number="9" hits="0" branch="false"/>
            <line number="10" hits="0" branch="true" condition-coverage="100% (1/1)"/>
            <line number="12" hits="4" branch="true" condition-coverage="100% (1/1)"/>
            <line number="13" hits="2" branch="false"/>
            <line number="14" hits="2" branch="true" condition-coverage="0% (0/1)"/>
            <line number="16" hits="4" branch="true" condition-coverage="0% (0/1)"/>
            <line number="17" hits="0" branch="false"/>
            <line number="18" hits="0" branch="false"/>
            <line number="20" hits="0" branch="false"/>
            <line number="21" hits="0" branch="false"/>
          </lines>
        </class>
        <class name="main.ts" filename="src\main.ts" line-rate="0" branch-rate="0">
          <methods>
            <method name="(empty-report)" hits="0" signature="()V">
              <lines>
                <line number="1" hits="0"/>
              </lines>
            </method>
          </methods>
          <lines>
            <line number="1" hits="0" branch="true" condition-coverage="0% (0/1)"/>
            <line number="2" hits="0" branch="false"/>
            <line number="3" hits="0" branch="false"/>
            <line number="5" hits="0" branch="false"/>
            <line number="8" hits="0" branch="false"/>
            <line number="11" hits="0" branch="false"/>
          </lines>
        </class>
      </classes>
    </package>
  </packages>
</coverage>

// vitest.config.ts
import { defineConfig } from 'vitest/config'

export default defineConfig({
  test: {
    coverage: {
        provider: 'v8',
        reporter: ['cobertura'],
        reportsDirectory: '../.coverage/foo',
        include: ['**/*.{ts,vue}'],
    }
  },
})

{
  "name": "foo",
  "private": true,
  "version": "0.0.0",
  "type": "module",
  "scripts": {
    "dev": "vite",
    "build": "tsc && vite build",
    "preview": "vite preview",
    "test": "vitest run --coverage"
  },
  "devDependencies": {
    "@vitest/coverage-v8": "^3.1.4",
    "typescript": "~5.8.3",
    "vite": "^6.3.5",
    "vitest": "^3.1.4"
  }
}

System Info

  npmPackages:
    @vitest/coverage-v8: ^3.1.4 => 3.1.4 
    vite: ^6.3.5 => 6.3.5 
    vitest: ^3.1.4 => 3.1.4 

Used Package Manager

npm

Validations

• [x] Follow our Code of Conduct
• [x] Read the Contributing Guidelines.
• [x] Read the docs.
• [x] Check that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• [x] Check that this is a concrete bug. For Q&A open a GitHub Discussion or join our Discord Chat Server.
• [x] The provided reproduction is a minimal reproducible example of the bug.

[AriPerkkio]

I guess this is the specification for Cobertura? https://github.com/cobertura/web/blob/master/htdocs/xml/coverage-04.dtd

Looks like Istanbul reporters don't add <condition> at all: https://github.com/istanbuljs/istanbuljs/blob/main/packages/istanbul-reports/lib/cobertura/index.js#L79-L137

I would recommend to open an issue at: https://github.com/istanbuljs/istanbuljs/issues

[AriPerkkio]

Closing as upstream issue. There's nothing to change on Vitest side.

Note that you can also create custom reporters: https://vitest.dev/guide/coverage.html#custom-coverage-reporter.