# test.coordination/core/comparators/snapshot.comparator.test.ts

> 30 lines of code and 0 definitions.

Tree: Codebase Testing
Language: typescript
Canonical: https://banes-lab.com/anatomy/testing#file-testing-test-coordination-core-comparators-snapshot-comparator-test-ts
Source text: https://banes-lab.com/source/testing/test.coordination/core/comparators/snapshot.comparator.test.ts.txt

Listed in [test.coordination/core/comparators](https://banes-lab.com/api/source/testing/test.coordination/core/comparators.md), after [test.coordination/core/comparators/gate.comparator.test.ts](https://banes-lab.com/source/testing/test.coordination/core/comparators/gate.comparator.test.ts.md).

## Contained in

- [test.coordination/core/comparators](https://banes-lab.com/anatomy/testing/folder-testing-test-coordination-core-comparators.md)

## Source

```typescript
import { describe, it } from "vitest";
import { mkdtempSync, rmSync } from "node:fs";
import assert from "node:assert/strict";
import { comparison } from "coordination-surface/tools/core/comparators/snapshot.comparator.ts";
import { join } from "node:path";
import { tmpdir } from "node:os";

type Options = Parameters<typeof comparison>[0];

describe("comparison", () => {
    it("carries a fresh baseline over the run's range when nothing was retained, with no finding", () => {
        const repoRoot = mkdtempSync(join(tmpdir(), "coordination-compare-"));
        try {
            const options: Options = {
                authoritative: false,
                bypass: [],
                fix: false,
                repoRoot,
                scanned: 0,
                scope: "whole",
            };
            const compared = comparison(options, []);
            assert.equal(compared.retained, null);
            assert.equal(compared.carried.range, "whole");
            assert.deepEqual(compared.findings, []);
            assert.deepEqual(compared.renamed, []);
            assert.ok(Object.values(compared.verdicts).every((verdict) => verdict === "first-seen"));
        } finally {
            rmSync(repoRoot, { force: true, recursive: true });
        }
    });
});
```