ceph/src/arrow/js/test/unit/bit-tests.ts

   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 });