diff --git a/.gitignore b/.gitignore
index d3b50445e9..4c0884dec8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -20,7 +20,7 @@ electron/themes
 electron/playwright-report
 server/pre-install
 package-lock.json
-
+coverage
 *.log
 core/lib/**
 
diff --git a/joi/jest.config.js b/joi/jest.config.js
new file mode 100644
index 0000000000..8543f24e30
--- /dev/null
+++ b/joi/jest.config.js
@@ -0,0 +1,8 @@
+module.exports = {
+  preset: 'ts-jest',
+  testEnvironment: 'node',
+  roots: ['<rootDir>/src'],
+  testMatch: ['**/*.test.*'],
+  setupFilesAfterEnv: ['<rootDir>/jest.setup.js'],
+  testEnvironment: 'jsdom',
+}
diff --git a/joi/jest.setup.js b/joi/jest.setup.js
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/joi/package.json b/joi/package.json
index 3f1bd07f73..c336cce12f 100644
--- a/joi/package.json
+++ b/joi/package.json
@@ -21,7 +21,8 @@
   "bugs": "https://github.com/codecentrum/piksel/issues",
   "scripts": {
     "dev": "rollup -c -w",
-    "build": "rimraf ./dist && rollup -c"
+    "build": "rimraf ./dist && rollup -c",
+    "test": "jest"
   },
   "peerDependencies": {
     "class-variance-authority": "^0.7.0",
@@ -38,13 +39,22 @@
     "@radix-ui/react-slot": "^1.0.2",
     "@radix-ui/react-tabs": "^1.0.4",
     "@radix-ui/react-tooltip": "^1.0.7",
-    "tailwind-merge": "^2.2.0",
+    "@types/jest": "^29.5.12",
     "autoprefixer": "10.4.16",
-    "tailwindcss": "^3.4.1"
+    "jest": "^29.7.0",
+    "tailwind-merge": "^2.2.0",
+    "tailwindcss": "^3.4.1",
+    "ts-jest": "^29.2.5"
   },
   "devDependencies": {
     "@rollup/plugin-node-resolve": "^15.2.3",
     "@rollup/plugin-terser": "^0.4.4",
+    "@testing-library/dom": "^10.4.0",
+    "@testing-library/jest-dom": "^6.5.0",
+    "@testing-library/react": "^16.0.1",
+    "@types/jest": "^29.5.12",
+    "jest-environment-jsdom": "^29.7.0",
+    "jest-transform-css": "^6.0.1",
     "prettier": "^3.0.3",
     "prettier-plugin-tailwindcss": "^0.5.6",
     "rollup": "^4.12.0",
diff --git a/joi/src/core/Accordion/Accordion.test.tsx b/joi/src/core/Accordion/Accordion.test.tsx
new file mode 100644
index 0000000000..62b575ea3b
--- /dev/null
+++ b/joi/src/core/Accordion/Accordion.test.tsx
@@ -0,0 +1,64 @@
+import React from 'react'
+import '@testing-library/jest-dom'
+import { render, screen, fireEvent } from '@testing-library/react'
+import { Accordion, AccordionItem } from './index'
+
+// Mock the SCSS import
+jest.mock('./styles.scss', () => ({}))
+
+describe('Accordion', () => {
+  it('renders accordion with items', () => {
+    render(
+      <Accordion defaultValue={['item1']}>
+        <AccordionItem value="item1" title="Item 1">
+          Content 1
+        </AccordionItem>
+        <AccordionItem value="item2" title="Item 2">
+          Content 2
+        </AccordionItem>
+      </Accordion>
+    )
+
+    expect(screen.getByText('Item 1')).toBeInTheDocument()
+    expect(screen.getByText('Item 2')).toBeInTheDocument()
+  })
+
+  it('expands and collapses accordion items', () => {
+    render(
+      <Accordion defaultValue={[]}>
+        <AccordionItem value="item1" title="Item 1">
+          Content 1
+        </AccordionItem>
+      </Accordion>
+    )
+
+    const trigger = screen.getByText('Item 1')
+
+    // Initially, content should not be visible
+    expect(screen.queryByText('Content 1')).not.toBeInTheDocument()
+
+    // Click to expand
+    fireEvent.click(trigger)
+    expect(screen.getByText('Content 1')).toBeInTheDocument()
+
+    // Click to collapse
+    fireEvent.click(trigger)
+    expect(screen.queryByText('Content 1')).not.toBeInTheDocument()
+  })
+
+  it('respects defaultValue prop', () => {
+    render(
+      <Accordion defaultValue={['item2']}>
+        <AccordionItem value="item1" title="Item 1">
+          Content 1
+        </AccordionItem>
+        <AccordionItem value="item2" title="Item 2">
+          Content 2
+        </AccordionItem>
+      </Accordion>
+    )
+
+    expect(screen.queryByText('Content 1')).not.toBeInTheDocument()
+    expect(screen.getByText('Content 2')).toBeInTheDocument()
+  })
+})
diff --git a/joi/src/core/Badge/Badge.test.tsx b/joi/src/core/Badge/Badge.test.tsx
new file mode 100644
index 0000000000..1d3192be73
--- /dev/null
+++ b/joi/src/core/Badge/Badge.test.tsx
@@ -0,0 +1,83 @@
+import React from 'react'
+import { render, screen } from '@testing-library/react'
+import '@testing-library/jest-dom'
+import { Badge, badgeConfig } from './index'
+
+// Mock the styles
+jest.mock('./styles.scss', () => ({}))
+
+describe('@joi/core/Badge', () => {
+  it('renders with default props', () => {
+    render(<Badge>Test Badge</Badge>)
+    const badge = screen.getByText('Test Badge')
+    expect(badge).toBeInTheDocument()
+    expect(badge).toHaveClass('badge')
+    expect(badge).toHaveClass('badge--primary')
+    expect(badge).toHaveClass('badge--medium')
+    expect(badge).toHaveClass('badge--solid')
+  })
+
+  it('applies custom className', () => {
+    render(<Badge className="custom-class">Test Badge</Badge>)
+    const badge = screen.getByText('Test Badge')
+    expect(badge).toHaveClass('custom-class')
+  })
+
+  it('renders with different themes', () => {
+    const themes = Object.keys(badgeConfig.variants.theme)
+    themes.forEach((theme) => {
+      render(<Badge theme={theme as any}>Test Badge {theme}</Badge>)
+      const badge = screen.getByText(`Test Badge ${theme}`)
+      expect(badge).toHaveClass(`badge--${theme}`)
+    })
+  })
+
+  it('renders with different variants', () => {
+    const variants = Object.keys(badgeConfig.variants.variant)
+    variants.forEach((variant) => {
+      render(<Badge variant={variant as any}>Test Badge {variant}</Badge>)
+      const badge = screen.getByText(`Test Badge ${variant}`)
+      expect(badge).toHaveClass(`badge--${variant}`)
+    })
+  })
+
+  it('renders with different sizes', () => {
+    const sizes = Object.keys(badgeConfig.variants.size)
+    sizes.forEach((size) => {
+      render(<Badge size={size as any}>Test Badge {size}</Badge>)
+      const badge = screen.getByText(`Test Badge ${size}`)
+      expect(badge).toHaveClass(`badge--${size}`)
+    })
+  })
+
+  it('fails when a new theme is added without updating the test', () => {
+    const expectedThemes = [
+      'primary',
+      'secondary',
+      'warning',
+      'success',
+      'info',
+      'destructive',
+    ]
+    const actualThemes = Object.keys(badgeConfig.variants.theme)
+    expect(actualThemes).toEqual(expectedThemes)
+  })
+
+  it('fails when a new variant is added without updating the test', () => {
+    const expectedVariant = ['solid', 'soft', 'outline']
+    const actualVariants = Object.keys(badgeConfig.variants.variant)
+    expect(actualVariants).toEqual(expectedVariant)
+  })
+
+  it('fails when a new size is added without updating the test', () => {
+    const expectedSizes = ['small', 'medium', 'large']
+    const actualSizes = Object.keys(badgeConfig.variants.size)
+    expect(actualSizes).toEqual(expectedSizes)
+  })
+
+  it('fails when a new variant CVA is added without updating the test', () => {
+    const expectedVariantsCVA = ['theme', 'variant', 'size']
+    const actualVariant = Object.keys(badgeConfig.variants)
+    expect(actualVariant).toEqual(expectedVariantsCVA)
+  })
+})
diff --git a/joi/src/core/Badge/index.tsx b/joi/src/core/Badge/index.tsx
index ffc34624f0..d9b04fd2bb 100644
--- a/joi/src/core/Badge/index.tsx
+++ b/joi/src/core/Badge/index.tsx
@@ -6,7 +6,7 @@ import { twMerge } from 'tailwind-merge'
 
 import './styles.scss'
 
-const badgeVariants = cva('badge', {
+export const badgeConfig = {
   variants: {
     theme: {
       primary: 'badge--primary',
@@ -28,11 +28,13 @@ const badgeVariants = cva('badge', {
     },
   },
   defaultVariants: {
-    theme: 'primary',
-    size: 'medium',
-    variant: 'solid',
+    theme: 'primary' as const,
+    size: 'medium' as const,
+    variant: 'solid' as const,
   },
-})
+}
+
+const badgeVariants = cva('badge', badgeConfig)
 
 export interface BadgeProps
   extends HTMLAttributes<HTMLDivElement>,
diff --git a/joi/src/core/Button/Button.test.tsx b/joi/src/core/Button/Button.test.tsx
new file mode 100644
index 0000000000..3ff76143c4
--- /dev/null
+++ b/joi/src/core/Button/Button.test.tsx
@@ -0,0 +1,68 @@
+import React from 'react'
+import { render, screen } from '@testing-library/react'
+import '@testing-library/jest-dom'
+import { Button, buttonConfig } from './index'
+
+// Mock the styles
+jest.mock('./styles.scss', () => ({}))
+
+describe('Button', () => {
+  it('renders with default props', () => {
+    render(<Button>Click me</Button>)
+    const button = screen.getByRole('button', { name: /click me/i })
+    expect(button).toBeInTheDocument()
+    expect(button).toHaveClass('btn btn--primary btn--medium btn--solid')
+  })
+
+  it('renders as a child component when asChild is true', () => {
+    render(
+      <Button asChild>
+        <a href="/">Link Button</a>
+      </Button>
+    )
+    const link = screen.getByRole('link', { name: /link button/i })
+    expect(link).toBeInTheDocument()
+    expect(link).toHaveClass('btn btn--primary btn--medium btn--solid')
+  })
+
+  it.each(Object.keys(buttonConfig.variants.theme))(
+    'renders with theme %s',
+    (theme) => {
+      render(<Button theme={theme as any}>Theme Button</Button>)
+      const button = screen.getByRole('button', { name: /theme button/i })
+      expect(button).toHaveClass(`btn btn--${theme}`)
+    }
+  )
+
+  it.each(Object.keys(buttonConfig.variants.variant))(
+    'renders with variant %s',
+    (variant) => {
+      render(<Button variant={variant as any}>Variant Button</Button>)
+      const button = screen.getByRole('button', { name: /variant button/i })
+      expect(button).toHaveClass(`btn btn--${variant}`)
+    }
+  )
+
+  it.each(Object.keys(buttonConfig.variants.size))(
+    'renders with size %s',
+    (size) => {
+      render(<Button size={size as any}>Size Button</Button>)
+      const button = screen.getByRole('button', { name: /size button/i })
+      expect(button).toHaveClass(`btn btn--${size}`)
+    }
+  )
+
+  it('renders with block prop', () => {
+    render(<Button block>Block Button</Button>)
+    const button = screen.getByRole('button', { name: /block button/i })
+    expect(button).toHaveClass('btn btn--block')
+  })
+
+  it('merges custom className with generated classes', () => {
+    render(<Button className="custom-class">Custom Class Button</Button>)
+    const button = screen.getByRole('button', { name: /custom class button/i })
+    expect(button).toHaveClass(
+      'btn btn--primary btn--medium btn--solid custom-class'
+    )
+  })
+})
diff --git a/joi/src/core/Button/index.tsx b/joi/src/core/Button/index.tsx
index 014f534b02..9945eb4e97 100644
--- a/joi/src/core/Button/index.tsx
+++ b/joi/src/core/Button/index.tsx
@@ -7,7 +7,7 @@ import { twMerge } from 'tailwind-merge'
 
 import './styles.scss'
 
-const buttonVariants = cva('btn', {
+export const buttonConfig = {
   variants: {
     theme: {
       primary: 'btn--primary',
@@ -30,12 +30,13 @@ const buttonVariants = cva('btn', {
     },
   },
   defaultVariants: {
-    theme: 'primary',
-    size: 'medium',
-    variant: 'solid',
-    block: false,
+    theme: 'primary' as const,
+    size: 'medium' as const,
+    variant: 'solid' as const,
+    block: false as const,
   },
-})
+}
+const buttonVariants = cva('btn', buttonConfig)
 
 export interface ButtonProps
   extends ButtonHTMLAttributes<HTMLButtonElement>,
diff --git a/joi/src/hooks/useClickOutside/useClickOutside.test.tsx b/joi/src/hooks/useClickOutside/useClickOutside.test.tsx
new file mode 100644
index 0000000000..ac73b280a4
--- /dev/null
+++ b/joi/src/hooks/useClickOutside/useClickOutside.test.tsx
@@ -0,0 +1,55 @@
+import React from 'react'
+import { render, fireEvent, act } from '@testing-library/react'
+import { useClickOutside } from './index'
+
+// Mock component to test the hook
+const TestComponent: React.FC<{ onClickOutside: () => void }> = ({
+  onClickOutside,
+}) => {
+  const ref = useClickOutside(onClickOutside)
+  return <div ref={ref as React.RefObject<HTMLDivElement>}>Test</div>
+}
+
+describe('@joi/hooks/useClickOutside', () => {
+  it('should call handler when clicking outside', () => {
+    const handleClickOutside = jest.fn()
+    const { container } = render(
+      <TestComponent onClickOutside={handleClickOutside} />
+    )
+
+    act(() => {
+      fireEvent.mouseDown(document.body)
+    })
+
+    expect(handleClickOutside).toHaveBeenCalledTimes(1)
+  })
+
+  it('should not call handler when clicking inside', () => {
+    const handleClickOutside = jest.fn()
+    const { getByText } = render(
+      <TestComponent onClickOutside={handleClickOutside} />
+    )
+
+    act(() => {
+      fireEvent.mouseDown(getByText('Test'))
+    })
+
+    expect(handleClickOutside).not.toHaveBeenCalled()
+  })
+
+  it('should work with custom events', () => {
+    const handleClickOutside = jest.fn()
+    const TestComponentWithCustomEvent: React.FC = () => {
+      const ref = useClickOutside(handleClickOutside, ['click'])
+      return <div ref={ref as React.RefObject<HTMLDivElement>}>Test</div>
+    }
+
+    render(<TestComponentWithCustomEvent />)
+
+    act(() => {
+      fireEvent.click(document.body)
+    })
+
+    expect(handleClickOutside).toHaveBeenCalledTimes(1)
+  })
+})
diff --git a/joi/src/hooks/useClipboard/useClipboard.test.ts b/joi/src/hooks/useClipboard/useClipboard.test.ts
new file mode 100644
index 0000000000..53b4ccd27b
--- /dev/null
+++ b/joi/src/hooks/useClipboard/useClipboard.test.ts
@@ -0,0 +1,102 @@
+import { renderHook, act } from '@testing-library/react'
+import { useClipboard } from './index'
+
+// Mock the navigator.clipboard
+const mockClipboard = {
+  writeText: jest.fn(() => Promise.resolve()),
+}
+Object.assign(navigator, { clipboard: mockClipboard })
+
+describe('@joi/hooks/useClipboard', () => {
+  beforeEach(() => {
+    jest.useFakeTimers()
+    jest.spyOn(window, 'setTimeout')
+    jest.spyOn(window, 'clearTimeout')
+    mockClipboard.writeText.mockClear()
+  })
+
+  afterEach(() => {
+    jest.useRealTimers()
+    jest.clearAllMocks()
+  })
+
+  it('should copy text to clipboard', async () => {
+    const { result } = renderHook(() => useClipboard())
+
+    await act(async () => {
+      result.current.copy('Test text')
+    })
+
+    expect(navigator.clipboard.writeText).toHaveBeenCalledWith('Test text')
+    expect(result.current.copied).toBe(true)
+    expect(result.current.error).toBe(null)
+  })
+
+  it('should set error if clipboard write fails', async () => {
+    mockClipboard.writeText.mockRejectedValueOnce(
+      new Error('Clipboard write failed')
+    )
+
+    const { result } = renderHook(() => useClipboard())
+
+    await act(async () => {
+      result.current.copy('Test text')
+    })
+
+    expect(result.current.error).toBeInstanceOf(Error)
+    expect(result.current.error?.message).toBe('Clipboard write failed')
+  })
+
+  it('should set error if clipboard is not supported', async () => {
+    const originalClipboard = navigator.clipboard
+    // @ts-ignore
+    delete navigator.clipboard
+
+    const { result } = renderHook(() => useClipboard())
+
+    await act(async () => {
+      result.current.copy('Test text')
+    })
+
+    expect(result.current.error).toBeInstanceOf(Error)
+    expect(result.current.error?.message).toBe(
+      'useClipboard: navigator.clipboard is not supported'
+    )
+
+    // Restore clipboard support
+    Object.assign(navigator, { clipboard: originalClipboard })
+  })
+
+  it('should reset copied state after timeout', async () => {
+    const { result } = renderHook(() => useClipboard({ timeout: 1000 }))
+
+    await act(async () => {
+      result.current.copy('Test text')
+    })
+
+    expect(result.current.copied).toBe(true)
+
+    act(() => {
+      jest.advanceTimersByTime(1000)
+    })
+
+    expect(result.current.copied).toBe(false)
+  })
+
+  it('should reset state when reset is called', async () => {
+    const { result } = renderHook(() => useClipboard())
+
+    await act(async () => {
+      result.current.copy('Test text')
+    })
+
+    expect(result.current.copied).toBe(true)
+
+    act(() => {
+      result.current.reset()
+    })
+
+    expect(result.current.copied).toBe(false)
+    expect(result.current.error).toBe(null)
+  })
+})
diff --git a/joi/src/hooks/useMediaQuery/useMediaQuery.test.ts b/joi/src/hooks/useMediaQuery/useMediaQuery.test.ts
new file mode 100644
index 0000000000..5813bd41d8
--- /dev/null
+++ b/joi/src/hooks/useMediaQuery/useMediaQuery.test.ts
@@ -0,0 +1,90 @@
+import { renderHook, act } from '@testing-library/react'
+import { useMediaQuery } from './index'
+
+describe('@joi/hooks/useMediaQuery', () => {
+  const matchMediaMock = jest.fn()
+
+  beforeAll(() => {
+    window.matchMedia = matchMediaMock
+  })
+
+  afterEach(() => {
+    matchMediaMock.mockClear()
+  })
+
+  it('should return initial value when getInitialValueInEffect is true', () => {
+    matchMediaMock.mockImplementation(() => ({
+      matches: true,
+      addListener: jest.fn(),
+      removeListener: jest.fn(),
+    }))
+
+    const { result } = renderHook(() =>
+      useMediaQuery('(min-width: 768px)', true, {
+        getInitialValueInEffect: true,
+      })
+    )
+
+    expect(result.current).toBe(true)
+  })
+
+  it('should return correct value based on media query', () => {
+    matchMediaMock.mockImplementation(() => ({
+      matches: true,
+      addEventListener: jest.fn(),
+      removeEventListener: jest.fn(),
+    }))
+
+    const { result } = renderHook(() => useMediaQuery('(min-width: 768px)'))
+
+    expect(result.current).toBe(true)
+  })
+
+  it('should update value when media query changes', () => {
+    let listener: ((event: { matches: boolean }) => void) | null = null
+
+    matchMediaMock.mockImplementation(() => ({
+      matches: false,
+      addEventListener: (_, cb) => {
+        listener = cb
+      },
+      removeEventListener: jest.fn(),
+    }))
+
+    const { result } = renderHook(() => useMediaQuery('(min-width: 768px)'))
+
+    expect(result.current).toBe(false)
+
+    act(() => {
+      if (listener) {
+        listener({ matches: true })
+      }
+    })
+
+    expect(result.current).toBe(true)
+  })
+
+  it('should handle older browsers without addEventListener', () => {
+    let listener: ((event: { matches: boolean }) => void) | null = null
+
+    matchMediaMock.mockImplementation(() => ({
+      matches: false,
+      addListener: (cb) => {
+        listener = cb
+      },
+      removeListener: jest.fn(),
+    }))
+
+    const { result } = renderHook(() => useMediaQuery('(min-width: 768px)'))
+
+    expect(result.current).toBe(false)
+
+    act(() => {
+      if (listener) {
+        listener({ matches: true })
+      }
+    })
+
+    expect(result.current).toBe(true)
+  })
+})
diff --git a/joi/src/hooks/useOs/useOs.test.ts b/joi/src/hooks/useOs/useOs.test.ts
new file mode 100644
index 0000000000..037640b5e1
--- /dev/null
+++ b/joi/src/hooks/useOs/useOs.test.ts
@@ -0,0 +1,39 @@
+import { renderHook } from '@testing-library/react'
+import { useOs } from './index'
+
+const platforms = {
+  windows: [
+    'Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:47.0) Gecko/20100101 Firefox/47.0',
+  ],
+  macos: [
+    'Mozilla/5.0 (Macintosh; Intel Mac OS X x.y; rv:42.0) Gecko/20100101 Firefox/42.0',
+  ],
+  linux: [
+    'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.103 Safari/537.36',
+  ],
+  ios: [
+    'Mozilla/5.0 (iPhone; CPU iPhone OS 13_5_1 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.1.1 Mobile/15E148 Safari/604.1',
+  ],
+  android: [
+    'Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Mobile Safari/537.36',
+  ],
+  undetermined: ['UNKNOWN'],
+} as const
+
+describe('@joi/hooks/useOS', () => {
+  afterEach(() => {
+    jest.clearAllMocks()
+  })
+
+  Object.entries(platforms).forEach(([os, userAgents]) => {
+    it.each(userAgents)(`should detect %s platform on ${os}`, (userAgent) => {
+      jest
+        .spyOn(window.navigator, 'userAgent', 'get')
+        .mockReturnValueOnce(userAgent)
+
+      const { result } = renderHook(() => useOs())
+
+      expect(result.current).toBe(os)
+    })
+  })
+})
diff --git a/joi/src/hooks/usePageLeave/usePageLeave.test.ts b/joi/src/hooks/usePageLeave/usePageLeave.test.ts
new file mode 100644
index 0000000000..093ae31c10
--- /dev/null
+++ b/joi/src/hooks/usePageLeave/usePageLeave.test.ts
@@ -0,0 +1,32 @@
+import { renderHook } from '@testing-library/react'
+import { fireEvent } from '@testing-library/react'
+import { usePageLeave } from './index'
+
+describe('@joi/hooks/usePageLeave', () => {
+  it('should call onPageLeave when mouse leaves the document', () => {
+    const onPageLeaveMock = jest.fn()
+    const { result } = renderHook(() => usePageLeave(onPageLeaveMock))
+
+    fireEvent.mouseLeave(document.documentElement)
+
+    expect(onPageLeaveMock).toHaveBeenCalledTimes(1)
+  })
+
+  it('should remove event listener on unmount', () => {
+    const onPageLeaveMock = jest.fn()
+    const removeEventListenerSpy = jest.spyOn(
+      document.documentElement,
+      'removeEventListener'
+    )
+
+    const { unmount } = renderHook(() => usePageLeave(onPageLeaveMock))
+
+    unmount()
+
+    expect(removeEventListenerSpy).toHaveBeenCalledWith(
+      'mouseleave',
+      expect.any(Function)
+    )
+    removeEventListenerSpy.mockRestore()
+  })
+})
diff --git a/joi/src/hooks/useTextSelection/useTextSelection.test.ts b/joi/src/hooks/useTextSelection/useTextSelection.test.ts
new file mode 100644
index 0000000000..26efa23e71
--- /dev/null
+++ b/joi/src/hooks/useTextSelection/useTextSelection.test.ts
@@ -0,0 +1,56 @@
+import { renderHook, act } from '@testing-library/react'
+import { useTextSelection } from './index'
+
+describe('@joi/hooks/useTextSelection', () => {
+  let mockSelection: Selection
+
+  beforeEach(() => {
+    mockSelection = {
+      toString: jest.fn(),
+      removeAllRanges: jest.fn(),
+      addRange: jest.fn(),
+    } as unknown as Selection
+
+    jest.spyOn(document, 'getSelection').mockReturnValue(mockSelection)
+    jest.spyOn(document, 'addEventListener')
+    jest.spyOn(document, 'removeEventListener')
+  })
+
+  afterEach(() => {
+    jest.restoreAllMocks()
+  })
+
+  it('should return the initial selection', () => {
+    const { result } = renderHook(() => useTextSelection())
+    expect(result.current).toBe(mockSelection)
+  })
+
+  it('should add and remove event listener', () => {
+    const { unmount } = renderHook(() => useTextSelection())
+
+    expect(document.addEventListener).toHaveBeenCalledWith(
+      'selectionchange',
+      expect.any(Function)
+    )
+
+    unmount()
+
+    expect(document.removeEventListener).toHaveBeenCalledWith(
+      'selectionchange',
+      expect.any(Function)
+    )
+  })
+
+  it('should update selection when selectionchange event is triggered', () => {
+    const { result } = renderHook(() => useTextSelection())
+
+    const newMockSelection = { toString: jest.fn() } as unknown as Selection
+    jest.spyOn(document, 'getSelection').mockReturnValue(newMockSelection)
+
+    act(() => {
+      document.dispatchEvent(new Event('selectionchange'))
+    })
+
+    expect(result.current).toBe(newMockSelection)
+  })
+})
diff --git a/joi/tsconfig.json b/joi/tsconfig.json
index f72e8151e5..25e2ee66fb 100644
--- a/joi/tsconfig.json
+++ b/joi/tsconfig.json
@@ -3,6 +3,7 @@
     "target": "esnext",
     "declaration": true,
     "declarationDir": "dist/types",
+    "types": ["jest", "@testing-library/jest-dom"],
     "module": "esnext",
     "lib": ["es6", "dom", "es2016", "es2017"],
     "sourceMap": true,