Coverage regression checker

Open Coverage regression checker on Happytails.ai. This view has the same page content and links, with explicit tool capabilities. Read the processing notes before using a tool.

Tool capabilities

{
  "id": "coverage-regression-checker",
  "category": "developer-tools",
  "built": true,
  "requirements": "Up to 2,000,000 characters for each coverage report and 1,000,000 characters for the diff. Processing runs locally in a background worker in your browser. Downloads: a JSON report, a CSV of files and a Markdown table.",
  "implementation": {
    "fields": [
      {
        "key": "base",
        "label": "Base coverage report (before the change)",
        "value": "TN:\nSF:src/cart.js\nFN:3,addItem\nFNDA:4,addItem\nDA:3,4\nDA:4,4\nDA:5,0\nDA:7,4\nend_of_record\nSF:src/price.js\nDA:1,2\nDA:2,2\nDA:3,0\nend_of_record\n",
        "type": "textarea",
        "maxLength": 2000000,
        "help": "LCOV, Cobertura, JaCoCo, Istanbul or Go coverage from the base branch."
      },
      {
        "key": "changes",
        "label": "Unified diff or changed file list (optional)",
        "value": "diff --git a/src/cart.js b/src/cart.js\n--- a/src/cart.js\n+++ b/src/cart.js\n@@ -6,2 +6,4 @@\n }\n export function total(items){\n+  if(!items.length)return 0;\n+  return items.reduce((n,i)=>n+i.price,0);\ndiff --git a/src/price.js b/src/price.js\n--- a/src/price.js\n+++ b/src/price.js\n@@ -3,1 +3,1 @@\n-  return value;\n+  return Math.round(value*100)/100;\n",
        "type": "textarea",
        "maxLength": 1000000,
        "help": "A git diff gives patch coverage. A list of paths, one per line, limits the comparison to those files."
      },
      {
        "key": "format",
        "label": "Report format",
        "value": "auto",
        "type": "select",
        "values": [
          "auto",
          "lcov",
          "cobertura",
          "jacoco",
          "istanbul",
          "istanbul-summary",
          "go"
        ],
        "labels": {
          "auto": "Detect automatically",
          "lcov": "LCOV",
          "cobertura": "Cobertura",
          "jacoco": "JaCoCo",
          "istanbul": "Istanbul",
          "istanbul-summary": "Istanbul summary",
          "go": "Go coverage"
        }
      },
      {
        "key": "minPatch",
        "label": "Minimum patch coverage (%)",
        "value": "80",
        "type": "number",
        "min": 0,
        "max": 100,
        "step": "any"
      },
      {
        "key": "maxDrop",
        "label": "Largest allowed total drop (percentage points)",
        "value": "0",
        "type": "number",
        "min": 0,
        "max": 100,
        "step": "any"
      },
      {
        "key": "maxFileDrop",
        "label": "Largest allowed drop for one file (percentage points)",
        "value": "100",
        "type": "number",
        "min": 0,
        "max": 100,
        "step": "any",
        "help": "100 turns the per-file check off."
      },
      {
        "key": "stripPrefix",
        "label": "Path prefixes to remove",
        "value": "",
        "type": "text",
        "maxLength": 2000,
        "help": "Comma separated, for example /home/ci/project/."
      }
    ],
    "registrationFamily": "report-ingest-analysis-reference",
    "inputMaxLength": 2000000,
    "inputErrorCode": "REPORT_INGEST_ANALYSIS_REFERENCE_TOO_LONG",
    "note": "Runs in your browser in a background worker. Compares two coverage reports of up to 2,000,000 characters each and a diff of up to 1,000,000 characters.",
    "experience": {
      "automatic": false,
      "single": false,
      "inputMaxLength": 2000000,
      "inputMode": "text",
      "label": "Head coverage report",
      "placeholder": "SF:src/cart.js\nDA:3,5\nend_of_record",
      "help": "Paste the coverage file produced after your change, for example lcov.info or cobertura.xml. Up to 2,000,000 characters. Review the settings before running.",
      "helpParts": [
        "Paste the coverage file produced after your change, for example lcov.info or cobertura.xml.",
        "Up to 2,000,000 characters.",
        "Review the settings before running."
      ],
      "action": null
    },
    "mode": "explicit",
    "interactive": false
  },
  "execution": "Browser interface",
  "api": null,
  "browser_agent": {
    "supported": true,
    "name": "run_current_tool",
    "discovery": "WebMCP on the human page in a supporting browser",
    "verification": "See audit/API-AUDIT.md; availability is not verification"
  }
}

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