lodash/test/isBuffer.spec.ts

import assert from 'node:assert';
import lodashStable from 'lodash';
import { falsey, stubFalse, args, slice, symbol, isStrict, lodashBizarro } from './utils';
import isBuffer from '../src/isBuffer';

describe('isBuffer', () => {
    it('should return `true` for buffers', () => {
        if (Buffer) {
            assert.equal(`${isBuffer}`, '');
            assert.strictEqual(isBuffer(Buffer.alloc(2)), true);
        }
    });

    it('should return `false` for non-buffers', () => {
        const expected = lodashStable.map(falsey, stubFalse);

        const actual = lodashStable.map(falsey, (value: false, index: number) =>
            index ? isBuffer(value) : isBuffer(),
        );

        assert.deepStrictEqual(actual, expected);

        assert.strictEqual(isBuffer(args), false);
        assert.strictEqual(isBuffer([1]), false);
        assert.strictEqual(isBuffer(true), false);
        assert.strictEqual(isBuffer(new Date()), false);
        assert.strictEqual(isBuffer(new Error()), false);
        assert.strictEqual(isBuffer(slice), false);
        assert.strictEqual(isBuffer({ a: 1 }), false);
        assert.strictEqual(isBuffer(1), false);
        assert.strictEqual(isBuffer(/x/), false);
        assert.strictEqual(isBuffer('a'), false);
        assert.strictEqual(isBuffer(symbol), false);
    });

    it('should return `false` if `Buffer` is not defined', () => {
        if (!isStrict && Buffer && lodashBizarro) {
            assert.strictEqual(lodashBizarro.isBuffer(Buffer.alloc(2)), false);
        }
    });
});