diff --git a/packages/core/src/collections/filter.spec.ts b/packages/core/src/collections/filter.spec.ts
new file mode 100644
index 00000000..935af21a
--- /dev/null
+++ b/packages/core/src/collections/filter.spec.ts
@@ -0,0 +1,88 @@
+import { useDefaultFilter, type FilterContext } from './filter';
+
+describe('useDefaultFilter', () => {
+  const createContext = (search: string, label: string): FilterContext<string> => ({
+    search,
+    option: {
+      label,
+      value: label,
+    },
+  });
+
+  describe('case insensitive (default)', () => {
+    const { contains, startsWith, endsWith, equals } = useDefaultFilter();
+
+    it('contains should match substring regardless of case', () => {
+      expect(contains(createContext('world', 'Hello World'))).toBe(true);
+      expect(contains(createContext('WORLD', 'Hello World'))).toBe(true);
+      expect(contains(createContext('world', 'HELLO WORLD'))).toBe(true);
+      expect(contains(createContext('xyz', 'Hello World'))).toBe(false);
+    });
+
+    it('startsWith should match beginning of string regardless of case', () => {
+      expect(startsWith(createContext('hell', 'Hello World'))).toBe(true);
+      expect(startsWith(createContext('HELL', 'Hello World'))).toBe(true);
+      expect(startsWith(createContext('hell', 'HELLO WORLD'))).toBe(true);
+      expect(startsWith(createContext('world', 'Hello World'))).toBe(false);
+    });
+
+    it('endsWith should match end of string regardless of case', () => {
+      expect(endsWith(createContext('world', 'Hello World'))).toBe(true);
+      expect(endsWith(createContext('WORLD', 'Hello World'))).toBe(true);
+      expect(endsWith(createContext('world', 'HELLO WORLD'))).toBe(true);
+      expect(endsWith(createContext('hello', 'Hello World'))).toBe(false);
+    });
+
+    it('equals should match exact string regardless of case', () => {
+      expect(equals(createContext('hello world', 'Hello World'))).toBe(true);
+      expect(equals(createContext('HELLO WORLD', 'Hello World'))).toBe(true);
+      expect(equals(createContext('hello', 'Hello World'))).toBe(false);
+    });
+  });
+
+  describe('case sensitive', () => {
+    const { contains, startsWith, endsWith, equals } = useDefaultFilter({ caseSensitive: true });
+
+    it('contains should match substring with exact case', () => {
+      expect(contains(createContext('World', 'Hello World'))).toBe(true);
+      expect(contains(createContext('WORLD', 'Hello World'))).toBe(false);
+      expect(contains(createContext('world', 'Hello World'))).toBe(false);
+    });
+
+    it('startsWith should match beginning of string with exact case', () => {
+      expect(startsWith(createContext('Hello', 'Hello World'))).toBe(true);
+      expect(startsWith(createContext('HELLO', 'Hello World'))).toBe(false);
+      expect(startsWith(createContext('hello', 'Hello World'))).toBe(false);
+    });
+
+    it('endsWith should match end of string with exact case', () => {
+      expect(endsWith(createContext('World', 'Hello World'))).toBe(true);
+      expect(endsWith(createContext('WORLD', 'Hello World'))).toBe(false);
+      expect(endsWith(createContext('world', 'Hello World'))).toBe(false);
+    });
+
+    it('equals should match exact string with exact case', () => {
+      expect(equals(createContext('Hello World', 'Hello World'))).toBe(true);
+      expect(equals(createContext('HELLO WORLD', 'Hello World'))).toBe(false);
+      expect(equals(createContext('hello world', 'Hello World'))).toBe(false);
+    });
+  });
+
+  describe('debounce configuration', () => {
+    it('should set default debounce to 0', () => {
+      const { contains, startsWith, endsWith, equals } = useDefaultFilter();
+      expect(contains.debounceMs).toBe(0);
+      expect(startsWith.debounceMs).toBe(0);
+      expect(endsWith.debounceMs).toBe(0);
+      expect(equals.debounceMs).toBe(0);
+    });
+
+    it('should set custom debounce value', () => {
+      const { contains, startsWith, endsWith, equals } = useDefaultFilter({ debounceMs: 300 });
+      expect(contains.debounceMs).toBe(300);
+      expect(startsWith.debounceMs).toBe(300);
+      expect(endsWith.debounceMs).toBe(300);
+      expect(equals.debounceMs).toBe(300);
+    });
+  });
+});
diff --git a/vitest.config.ts b/vitest.config.ts
index 47375077..a5ed7183 100644
--- a/vitest.config.ts
+++ b/vitest.config.ts
@@ -21,6 +21,7 @@ export default defineConfig({
         'packages/**/dist/**',
         'packages/playground/**',
         'packages/test-utils/**',
+        'packages/starter-kits/**',
         './*.ts',
         './*.js',
         'docs/*',