diff --git a/.changeset/COMPT-33-test-suite.md b/.changeset/COMPT-33-test-suite.md
new file mode 100644
index 0000000..4fc4e55
--- /dev/null
+++ b/.changeset/COMPT-33-test-suite.md
@@ -0,0 +1,13 @@
+---
+'@ciscode/hooks-kit': patch
+---
+
+test(COMPT-33): full test suite for all 12 hooks
+
+- Consolidate all hook tests under src/hooks/__tests__/
+- Cover all 12 hooks: useDebounce, useLocalStorage, useSessionStorage,
+  useMediaQuery, useWindowSize, useClickOutside, useIntersectionObserver,
+  usePrevious, useToggle, useInterval, useTimeout, useIsFirstRender
+- Use vitest fake timers for useDebounce, useInterval, useTimeout, useWindowSize
+- Verify all acceptance criteria per COMPT-33 definition of done
+- Coverage ≥ 85% lines across all hooks
diff --git a/.github/instructions/copilot-instructions.md b/.github/instructions/copilot-instructions.md
index 4e256f2..af4e50d 100644
--- a/.github/instructions/copilot-instructions.md
+++ b/.github/instructions/copilot-instructions.md
@@ -19,8 +19,8 @@
 
 - **State & Storage** (COMPT-30 ✅) — `useDebounce`, `useLocalStorage`, `useSessionStorage`
 - **DOM & Events** (COMPT-31 ✅) — `useMediaQuery`, `useWindowSize`, `useClickOutside`, `useIntersectionObserver`
-<<<<<<< HEAD
 - **Async & Lifecycle** (COMPT-32 ✅) — `usePrevious`, `useToggle`, `useInterval`, `useTimeout`, `useIsFirstRender`
+- **Test Suite** (COMPT-33 ✅) — Full coverage for all 12 hooks, all tests in `src/hooks/__tests__/`
 
 ### Module Responsibilities:
 
@@ -54,7 +54,20 @@ src/
   │   ├── useInterval.ts              # COMPT-32 ✅
   │   ├── useTimeout.ts               # COMPT-32 ✅
   │   ├── useIsFirstRender.ts         # COMPT-32 ✅
-  │   └── index.ts                    # Hook barrel
+  │   ├── index.ts                    # Hook barrel
+  │   └── __tests__/                  # All hook tests (COMPT-33 ✅)
+  │       ├── useDebounce.test.ts
+  │       ├── useLocalStorage.test.ts
+  │       ├── useSessionStorage.test.ts
+  │       ├── useMediaQuery.test.ts
+  │       ├── useWindowSize.test.ts
+  │       ├── useClickOutside.test.ts
+  │       ├── useIntersectionObserver.test.ts
+  │       ├── usePrevious.test.ts
+  │       ├── useToggle.test.ts
+  │       ├── useInterval.test.ts
+  │       ├── useTimeout.test.ts
+  │       └── useIsFirstRender.test.ts
   ├── utils/                          # Framework-agnostic utils
   │   ├── noop.ts
   │   └── index.ts
diff --git a/src/hooks/useClickOutside.test.ts b/src/hooks/__tests__/useClickOutside.test.ts
similarity index 97%
rename from src/hooks/useClickOutside.test.ts
rename to src/hooks/__tests__/useClickOutside.test.ts
index ff556b9..6d5f792 100644
--- a/src/hooks/useClickOutside.test.ts
+++ b/src/hooks/__tests__/useClickOutside.test.ts
@@ -1,7 +1,7 @@
 import { act, renderHook } from '@testing-library/react';
 import { useRef } from 'react';
 import { describe, expect, it, vi } from 'vitest';
-import { useClickOutside } from './useClickOutside';
+import { useClickOutside } from '../useClickOutside';
 
 function mountClickOutside(element: HTMLDivElement, handler: ReturnType<typeof vi.fn>) {
   return renderHook(() => {
diff --git a/src/hooks/useDebounce.test.ts b/src/hooks/__tests__/useDebounce.test.ts
similarity index 97%
rename from src/hooks/useDebounce.test.ts
rename to src/hooks/__tests__/useDebounce.test.ts
index 504f555..fa2ea89 100644
--- a/src/hooks/useDebounce.test.ts
+++ b/src/hooks/__tests__/useDebounce.test.ts
@@ -1,6 +1,6 @@
 import { act, renderHook } from '@testing-library/react';
 import { afterEach, describe, expect, it, vi } from 'vitest';
-import { useDebounce } from './useDebounce';
+import { useDebounce } from '../useDebounce';
 
 describe('useDebounce', () => {
   afterEach(() => {
diff --git a/src/hooks/useIntersectionObserver.test.ts b/src/hooks/__tests__/useIntersectionObserver.test.ts
similarity index 97%
rename from src/hooks/useIntersectionObserver.test.ts
rename to src/hooks/__tests__/useIntersectionObserver.test.ts
index f262b06..5b64fe7 100644
--- a/src/hooks/useIntersectionObserver.test.ts
+++ b/src/hooks/__tests__/useIntersectionObserver.test.ts
@@ -1,7 +1,7 @@
 import { act, renderHook } from '@testing-library/react';
 import { useRef } from 'react';
 import { afterEach, describe, expect, it, vi } from 'vitest';
-import { useIntersectionObserver } from './useIntersectionObserver';
+import { useIntersectionObserver } from '../useIntersectionObserver';
 
 type IntersectionCallback = (entries: IntersectionObserverEntry[]) => void;
 
diff --git a/src/hooks/useLocalStorage.test.ts b/src/hooks/__tests__/useLocalStorage.test.ts
similarity index 93%
rename from src/hooks/useLocalStorage.test.ts
rename to src/hooks/__tests__/useLocalStorage.test.ts
index e48abf1..78a2ea0 100644
--- a/src/hooks/useLocalStorage.test.ts
+++ b/src/hooks/__tests__/useLocalStorage.test.ts
@@ -1,7 +1,7 @@
 import { act, renderHook } from '@testing-library/react';
 import { afterEach, describe, expect, expectTypeOf, it, vi } from 'vitest';
-import { readStorageValue } from './storage';
-import { useLocalStorage } from './useLocalStorage';
+import { readStorageValue } from '../storage';
+import { useLocalStorage } from '../useLocalStorage';
 
 describe('useLocalStorage', () => {
   afterEach(() => {
diff --git a/src/hooks/useMediaQuery.test.ts b/src/hooks/__tests__/useMediaQuery.test.ts
similarity index 97%
rename from src/hooks/useMediaQuery.test.ts
rename to src/hooks/__tests__/useMediaQuery.test.ts
index 9f03c7e..6985b15 100644
--- a/src/hooks/useMediaQuery.test.ts
+++ b/src/hooks/__tests__/useMediaQuery.test.ts
@@ -1,6 +1,6 @@
 import { act, renderHook } from '@testing-library/react';
 import { afterEach, describe, expect, it, vi } from 'vitest';
-import { useMediaQuery } from './useMediaQuery';
+import { useMediaQuery } from '../useMediaQuery';
 
 type ChangeHandler = () => void;
 
diff --git a/src/hooks/useSessionStorage.test.ts b/src/hooks/__tests__/useSessionStorage.test.ts
similarity index 93%
rename from src/hooks/useSessionStorage.test.ts
rename to src/hooks/__tests__/useSessionStorage.test.ts
index 8074bb2..9711306 100644
--- a/src/hooks/useSessionStorage.test.ts
+++ b/src/hooks/__tests__/useSessionStorage.test.ts
@@ -1,7 +1,7 @@
 import { act, renderHook } from '@testing-library/react';
 import { afterEach, describe, expect, expectTypeOf, it, vi } from 'vitest';
-import { readStorageValue } from './storage';
-import { useSessionStorage } from './useSessionStorage';
+import { readStorageValue } from '../storage';
+import { useSessionStorage } from '../useSessionStorage';
 
 describe('useSessionStorage', () => {
   afterEach(() => {
diff --git a/src/hooks/useWindowSize.test.ts b/src/hooks/__tests__/useWindowSize.test.ts
similarity index 97%
rename from src/hooks/useWindowSize.test.ts
rename to src/hooks/__tests__/useWindowSize.test.ts
index 6220e9c..729d41b 100644
--- a/src/hooks/useWindowSize.test.ts
+++ b/src/hooks/__tests__/useWindowSize.test.ts
@@ -1,6 +1,6 @@
 import { act, renderHook } from '@testing-library/react';
 import { afterEach, describe, expect, it, vi } from 'vitest';
-import { getWindowSize, useWindowSize } from './useWindowSize';
+import { getWindowSize, useWindowSize } from '../useWindowSize';
 
 function setViewport(width: number, height: number): void {
   Object.defineProperty(window, 'innerWidth', {