node-nlp/test/nlp/tokenizers/tokenizer-ja.test.js

Library for NLU (Natural Language Understanding) done in Node.js

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const { TokenizerJa } = require('../../../lib/nlp/tokenizers');

describe('Tokenizer Ja', () => {
  describe('Constructor', () => {
    test('It should create a new instance', () => {
      const tokenizer = new TokenizerJa();
      expect(tokenizer).toBeDefined();
    });
  });
  describe('Tokenize', () => {
    test('It empty string is provided return empty array', () => {
      const tokenizer = new TokenizerJa();
      const expected = [];
      const actual = tokenizer.tokenize('');
      expect(actual).toEqual(expected);
    });
    test('It must tokenize simple sentence', () => {
      const tokenizer = new TokenizerJa();
      const expected = ['計算', '機科', '学', 'に', 'おける', '字句', '解析',
        'じくかい', 'せき', '英', 'Lexical', 'Analysis', 'と', 'は', 'ソースコード',
        'を', '構成', 'する', '文字', 'の', '並び', 'を', 'トークン', 'token', 'の',
        '並び', 'に', '変換', 'する', 'こと', 'を', 'いう', 'ここ', 'でいう', 'トークン',
        'と', 'は', '意味', 'を', '持つ', 'コード', 'の', '最小', '単位', 'の', 'こと',
        '字句', '解析', 'を', '行う', 'プログラム', 'は', '字句', '解析', '器', 'lexical',
        'analyzer', '略称', 'lexer', 'と', '呼ば', 'れる', '字句', '解析', '器', 'は',
        'スキャナ', 'scanner', 'と', 'トークナイザ', 'tokenizer', 'から', '構成', 'さ',
        'れる'];
      const actual = tokenizer.tokenize('計算機科学における字句解析 (じくかいせき、英: Lexical Analysis) とは、ソースコードを構成する文字の並びを、トークン (token) の並びに変換することをいう。\n' +
        'ここでいう「トークン」とは、意味を持つコードの最小単位のこと。字句解析を行うプログラムは、字句解析器 (lexical analyzer, 略称：lexer) と呼ばれる。\n' +
        '字句解析器はスキャナ (scanner) とトークナイザ (tokenizer) から構成される。\n');
      expect(actual).toEqual(expected);
    });
  });
});