🧪 test normalizeEntry in storage.js

storage.js

@@ -15,12 +15,17 @@ const STORAGE_KEYS = {
 
 /**
  * Normalizes input entries to ensure consistent comparison (lowercase & trimmed).
+ * Also strips zero-width characters and collapses multiple consecutive whitespace.
  * @param {string} val - Raw string input.
  * @returns {string} Normalized string.
  */
 function normalizeEntry(val) {
   if (typeof val !== 'string') return '';
-  return val.trim().toLowerCase();
+  return val
+    .replace(/[\u200B-\u200D\uFEFF]/g, '')
+    .toLowerCase()
+    .replace(/\s+/g, ' ')
+    .trim();
 }
 
 /**
@@ -186,3 +191,13 @@ function removeBlockedItem(type, value) {
     });
   });
 }
+
+if (typeof module !== 'undefined' && module.exports) {
+  module.exports = {
+    STORAGE_KEYS,
+    normalizeEntry,
+    getBlockData,
+    addBlockedItem,
+    removeBlockedItem
+  };
+}

test/storage.test.js

@@ -0,0 +1,42 @@
+const { describe, it } = require('node:test');
+const assert = require('node:assert');
+const { normalizeEntry } = require('../storage.js');
+
+describe('normalizeEntry', () => {
+  it('should return empty string for non-string inputs', () => {
+    assert.strictEqual(normalizeEntry(null), '');
+    assert.strictEqual(normalizeEntry(undefined), '');
+    assert.strictEqual(normalizeEntry(123), '');
+    assert.strictEqual(normalizeEntry({}), '');
+    assert.strictEqual(normalizeEntry(['artist']), '');
+    assert.strictEqual(normalizeEntry(true), '');
+    assert.strictEqual(normalizeEntry(false), '');
+  });
+
+  it('should return empty string for empty string input', () => {
+    assert.strictEqual(normalizeEntry(''), '');
+    assert.strictEqual(normalizeEntry('   '), '');
+  });
+
+  it('should trim leading and trailing spaces and lowercase string', () => {
+    assert.strictEqual(normalizeEntry('  Taylor Swift  '), 'taylor swift');
+    assert.strictEqual(normalizeEntry('DRAKE'), 'drake');
+    assert.strictEqual(normalizeEntry('   The Beatles'), 'the beatles');
+  });
+
+  it('should collapse multiple inner whitespaces into a single space', () => {
+    assert.strictEqual(normalizeEntry('Radiohead    -   Karma   Police'), 'radiohead - karma police');
+    assert.strictEqual(normalizeEntry('Coldplay\t\n  Yellow'), 'coldplay yellow');
+  });
+
+  it('should strip zero-width spaces and zero-width joiners/non-joiners/BOM', () => {
+    // \u200B (zero-width space), \u200C (zero-width non-joiner), \u200D (zero-width joiner), \uFEFF (zero-width no-break space / BOM)
+    const stringWithZeroWidth = 'Artist\u200BName\u200CWith\u200DHidden\uFEFFChars';
+    assert.strictEqual(normalizeEntry(stringWithZeroWidth), 'artistnamewithhiddenchars');
+  });
+
+  it('should correctly normalize complex inputs combining casing, spaces, and zero-width characters', () => {
+    const complexInput = '   \u200B  Kanye   \u200D WEST  \uFEFF ';
+    assert.strictEqual(normalizeEntry(complexInput), 'kanye west');
+  });
+});