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kitabcitab/node_modules/grapheme-splitter/tests/grapheme_splitter_tests.js

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+const fs = require('fs')
+const test = require('tape')
+
+const GraphemeSplitter = require('../index')
+
+function ucs2encode(array) {
+  return array.map( value => {
+    let output = '';
+
+    if (value > 0xFFFF) {
+      value -= 0x10000;
+      output += String.fromCharCode(value >>> 10 & 0x3FF | 0xD800);
+      value = 0xDC00 | value & 0x3FF;
+    }
+
+    output += String.fromCharCode(value);
+    return output;
+  }).join('');
+}
+
+function testDataFromLine(line) {
+  const codePoints = line.split(/\s*[×÷]\s*/).map(c => parseInt(c, 16));
+  const input = ucs2encode(codePoints);
+
+  const expected = line.split(/\s*÷\s*/) .map(sequence => {
+    const codePoints = sequence.split(/\s*×\s*/).map(c => parseInt(c, 16))
+    return ucs2encode(codePoints)
+  });
+
+  return { input, expected };
+}
+
+const testData = fs.readFileSync('tests/GraphemeBreakTest.txt', 'utf-8')
+                   .split('\n')
+                   .filter(line =>
+                     line != null && line.length > 0 && !line.startsWith('#'))
+                   .map(line => line.split('#')[0])
+                   .map(testDataFromLine);
+
+// ---------------------------------------------------------------------------
+// Test cases
+// ---------------------------------------------------------------------------
+test('splitGraphemes returns properly split list from string', t => {
+  const splitter = new GraphemeSplitter();
+
+  t.plan(testData.length);
+
+  testData.forEach( ({ input, expected }) => {
+    const result = splitter.splitGraphemes(input);
+    
+    t.deepLooseEqual(result, expected);
+  });
+
+  t.end();
+});
+
+test('iterateGraphemes returns properly split iterator from string', t => {
+  const splitter = new GraphemeSplitter();
+
+  t.plan(testData.length);
+
+  testData.forEach( ({ input, expected }) => {
+    const result = splitter.iterateGraphemes(input);
+
+    t.deepLooseEqual([...result], expected);
+  });
+
+  t.end();
+});
+
+test('countGraphemes returns the correct number of graphemes in string', t => {
+  const splitter = new GraphemeSplitter();
+
+  t.plan(testData.length);
+
+  testData.forEach( ({ input, expected }) => {
+    const result = splitter.countGraphemes(input);
+
+    t.equal(result, expected.length);
+  });
+
+  t.end();
+});