diff --git a/src/ai/text-splitter.test.ts b/src/ai/text-splitter.test.ts
index 02cdee6..08301e5 100644
--- a/src/ai/text-splitter.test.ts
+++ b/src/ai/text-splitter.test.ts
@@ -1,50 +1,77 @@
 import assert from 'node:assert';
-import { describe, it } from 'node:test';
-
+import { describe, it, beforeEach } from 'node:test';
 import { RecursiveCharacterTextSplitter } from './text-splitter';
 
 describe('RecursiveCharacterTextSplitter', () => {
-  it('Should correctly split text by separators', () => {
-    const splitter = new RecursiveCharacterTextSplitter({
+  let splitter: RecursiveCharacterTextSplitter;
+
+  beforeEach(() => {
+    splitter = new RecursiveCharacterTextSplitter({
       chunkSize: 50,
       chunkOverlap: 10,
     });
+  });
+
+  it('Should correctly split text by separators', () => {
+    const text = 'Hello world, this is a test of the recursive text splitter.';
+
+    // Test with initial chunkSize
     assert.deepEqual(
-      splitter.splitText(
-        'Hello world, this is a test of the recursive text splitter.',
-      ),
-      ['Hello world', 'this is a test of the recursive text splitter'],
+      splitter.splitText(text),
+      ['Hello world', 'this is a test of the recursive text splitter']
     );
 
+    // Test with updated chunkSize
     splitter.chunkSize = 100;
     assert.deepEqual(
       splitter.splitText(
-        'Hello world, this is a test of the recursive text splitter. If I have a period, it should split along the period.',
+        'Hello world, this is a test of the recursive text splitter. If I have a period, it should split along the period.'
       ),
       [
         'Hello world, this is a test of the recursive text splitter',
         'If I have a period, it should split along the period.',
-      ],
+      ]
     );
 
+    // Test with another updated chunkSize
     splitter.chunkSize = 110;
     assert.deepEqual(
       splitter.splitText(
-        'Hello world, this is a test of the recursive text splitter. If I have a period, it should split along the period.\nOr, if there is a new line, it should prioritize splitting on new lines instead.',
+        'Hello world, this is a test of the recursive text splitter. If I have a period, it should split along the period.\nOr, if there is a new line, it should prioritize splitting on new lines instead.'
       ),
       [
         'Hello world, this is a test of the recursive text splitter',
         'If I have a period, it should split along the period.',
         'Or, if there is a new line, it should prioritize splitting on new lines instead.',
-      ],
+      ]
     );
   });
 
   it('Should handle empty string', () => {
-    const splitter = new RecursiveCharacterTextSplitter({
-      chunkSize: 50,
-      chunkOverlap: 10,
-    });
     assert.deepEqual(splitter.splitText(''), []);
   });
+
+  it('Should handle special characters and large texts', () => {
+    const largeText = 'A'.repeat(1000);
+    splitter.chunkSize = 200;
+    assert.deepEqual(
+      splitter.splitText(largeText),
+      Array(5).fill('A'.repeat(200))
+    );
+
+    const specialCharText = 'Hello!@# world$%^ &*( this) is+ a-test';
+    assert.deepEqual(
+      splitter.splitText(specialCharText),
+      ['Hello!@#', 'world$%^', '&*( this)', 'is+', 'a-test']
+    );
+  });
+
+  it('Should handle chunkSize equal to chunkOverlap', () => {
+    splitter.chunkSize = 50;
+    splitter.chunkOverlap = 50;
+    assert.throws(
+      () => splitter.splitText('Invalid configuration'),
+      new Error('Cannot have chunkOverlap >= chunkSize')
+    );
+  });
 });