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1 | // Licensed to the Apache Software Foundation (ASF) under one |
2 | // or more contributor license agreements. See the NOTICE file | |
3 | // distributed with this work for additional information | |
4 | // regarding copyright ownership. The ASF licenses this file | |
5 | // to you under the Apache License, Version 2.0 (the | |
6 | // "License"); you may not use this file except in compliance | |
7 | // with the License. You may obtain a copy of the License at | |
8 | // | |
9 | // http://www.apache.org/licenses/LICENSE-2.0 | |
10 | // | |
11 | // Unless required by applicable law or agreed to in writing, | |
12 | // software distributed under the License is distributed on an | |
13 | // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | |
14 | // KIND, either express or implied. See the License for the | |
15 | // specific language governing permissions and limitations | |
16 | // under the License. | |
17 | ||
18 | import * as Arrow from 'apache-arrow'; | |
19 | const { BitIterator, getBool } = Arrow.util; | |
20 | ||
21 | describe('Bits', () => { | |
22 | test('BitIterator produces correct bits for single byte', () => { | |
23 | const byte = new Uint8Array([0b11110000]); | |
24 | expect([...new BitIterator(byte, 0, 8, null, getBool)]).toEqual( | |
25 | [false, false, false, false, true, true, true, true]); | |
26 | ||
27 | expect([...new BitIterator(byte, 2, 5, null, getBool)]).toEqual( | |
28 | [false, false, true, true, true]); | |
29 | }); | |
30 | ||
31 | test('BitIterator produces correct bits for multiple bytes', () => { | |
32 | const byte = new Uint8Array([0b11110000, 0b10101010]); | |
33 | expect([...new BitIterator(byte, 0, 16, null, getBool)]).toEqual( | |
34 | [false, false, false, false, true, true, true, true, | |
35 | false, true, false, true, false, true, false, true]); | |
36 | ||
37 | expect([...new BitIterator(byte, 2, 11, null, getBool)]).toEqual( | |
38 | [false, false, true, true, true, true, | |
39 | false, true, false, true, false]); | |
40 | }); | |
41 | }); |