# test.build/core/persistence/icons.persistence.test.ts

> 19 lines of code and 0 definitions.

Tree: Codebase Testing
Language: typescript
Canonical: https://banes-lab.com/anatomy/testing#file-testing-test-build-core-persistence-icons-persistence-test-ts
Source text: https://banes-lab.com/source/testing/test.build/core/persistence/icons.persistence.test.ts.txt

Listed in [test.build/core/persistence](https://banes-lab.com/api/source/testing/test.build/core/persistence.md), after [test.build/core/persistence/graph.persistence.test.ts](https://banes-lab.com/source/testing/test.build/core/persistence/graph.persistence.test.ts.md) and before [test.build/core/persistence/journal.persistence.test.ts](https://banes-lab.com/source/testing/test.build/core/persistence/journal.persistence.test.ts.md).

## Contained in

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

## Source

```typescript
import { describe, expect, it } from "vitest";
import { mkdtempSync, readFileSync, rmSync } from "node:fs";
import { SUBSET_FILE } from "@banes-lab/build-scripts/configuration/constants/icons.constants.ts";
import { join } from "node:path";
import { tmpdir } from "node:os";
import { writeFontSubset } from "@banes-lab/build-scripts/core/persistence/icons.persistence.ts";

const WOFF2_SIGNATURE = "wOF2";

describe("writeFontSubset", () => {
    it("writes a woff2 font holding only the glyphs it is given", async () => {
        const dir = mkdtempSync(join(tmpdir(), "icons-"));
        try {
            await writeFontSubset(["x"], dir);
            const font = readFileSync(join(dir, SUBSET_FILE));
            expect(font.subarray(0, WOFF2_SIGNATURE.length).toString("latin1")).toBe(WOFF2_SIGNATURE);
        } finally {
            rmSync(dir, { force: true, recursive: true });
        }
    });
});
```