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/**
* @license
* Copyright 2025 Google LLC
* SPDX-License-Identifier: Apache-2.0
*/
import { isBinary } from './textUtils';
describe('textUtils', () => {
describe('isBinary', () => {
it('should return true for a buffer containing a null byte', () => {
const buffer = Buffer.from([
0x89, 0x50, 0x4e, 0x47, 0x0d, 0x1a, 0x0a, 0x00,
]);
expect(isBinary(buffer)).toBe(true);
});
it('should return false for a buffer containing only text', () => {
const buffer = Buffer.from('This is a test string.');
expect(isBinary(buffer)).toBe(false);
});
it('should return false for an empty buffer', () => {
const buffer = Buffer.from([]);
expect(isBinary(buffer)).toBe(false);
});
it('should return false for a null or undefined buffer', () => {
expect(isBinary(null)).toBe(false);
expect(isBinary(undefined)).toBe(false);
});
it('should only check the sample size', () => {
const longBufferWithNullByteAtEnd = Buffer.concat([
Buffer.from('a'.repeat(1024)),
Buffer.from([0x00]),
]);
expect(isBinary(longBufferWithNullByteAtEnd, 512)).toBe(false);
});
});
});
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