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    "story_id": "mp-2026-10-09-018",
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    "headline": "The Tests Passed One Reference and Rejected Valid Alternatives",
    "slug": "the-tests-passed-one-reference-and-rejected-valid-alternatives",
    "dek": "TestPrism evaluates generated tests against multiple correct and incorrect implementations.",
    "summary": "TestPrism evaluates generated tests against multiple correct and incorrect implementations.",
    "body_text": "Across 300 tasks and 3,000 candidate implementations, joint success required failing the initial program, accepting every valid candidate and rejecting every invalid one. Baseline configurations reached 28% on that measure versus 59.67% for single-reference success. TestHelix improved joint success by 8.67 to 9 percentage points in its two-model comparison.",
    "why_it_matters": "TestPrism evaluates generated tests against multiple correct and incorrect implementations.",
    "limitations": [],
    "importance": 7,
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    "modified_at": "2026-10-10T03:43:44.000-04:00",
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    "source_ids": [
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    "tags": [
      "test generation",
      "implementation diversity"
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    "image_url": null,
    "corrections": []
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  "sources": [
    {
      "source_id": "source-2026-10-09-020",
      "title": "arXiv preprint 2610.12289, original v1",
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  "publisher": {
    "name": "The Machine Press",
    "url": "https://themachinepress.com",
    "description": "A daily newspaper for the age of artificial intelligence."
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  "cite_this_report": {
    "title": "The Tests Passed One Reference and Rejected Valid Alternatives",
    "publisher": "The Machine Press",
    "published_at": "2026-10-09T09:00:00.000-04:00",
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