diff --git a/src/domain/card-schemas.test.ts b/src/domain/card-schemas.test.ts
new file mode 100644
index 0000000..7be3590
--- /dev/null
+++ b/src/domain/card-schemas.test.ts
@@ -0,0 +1,39 @@
+// @vitest-environment node
+import { describe, expect, it } from 'vitest'
+import { createCardSchema, updateCardSchema } from './card-schemas'
+
+describe('createCardSchema', () => {
+  it('accepte une entrée valide et normalise les champs', () => {
+    const result = createCardSchema.parse({
+      question: '  Question ?  ',
+      response: 'Réponse',
+      theme: ' javascript ',
+      tags: ['scope'],
+    })
+    expect(result.question).toBe('Question ?')
+    expect(result.theme).toBe('javascript')
+  })
+
+  it('accepte une entrée sans tags', () => {
+    expect(createCardSchema.parse({ question: 'Q', response: 'R', theme: 'git' }).tags).toBeUndefined()
+  })
+
+  it('rejette une question vide', () => {
+    expect(() => createCardSchema.parse({ question: ' ', response: 'R', theme: 'git' })).toThrow()
+  })
+
+  it('rejette un thème manquant', () => {
+    expect(() => createCardSchema.parse({ question: 'Q', response: 'R' })).toThrow()
+  })
+})
+
+describe('updateCardSchema', () => {
+  it('accepte une mise à jour partielle', () => {
+    const result = updateCardSchema.parse({ response: 'Nouvelle réponse' })
+    expect(result).toEqual({ response: 'Nouvelle réponse' })
+  })
+
+  it('rejette un champ vide lors d une mise à jour', () => {
+    expect(() => updateCardSchema.parse({ theme: '' })).toThrow()
+  })
+})
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diff --git a/src/services/card-service.test.ts b/src/services/card-service.test.ts
new file mode 100644
index 0000000..0e1062b
--- /dev/null
+++ b/src/services/card-service.test.ts
@@ -0,0 +1,115 @@
+// @vitest-environment node
+import { describe, expect, it, vi } from 'vitest'
+import type { Card } from '@/domain/card'
+import type { CardRepository } from '@/domain/card-repository'
+import { NotFoundError } from '@/domain/errors'
+import { CardService } from './card-service'
+
+const CARD: Card = {
+  id: '10000000-0000-4000-8000-000000000001',
+  question: 'Qu est-ce qu une closure ?',
+  response: 'Une fonction qui conserve la portée de sa définition.',
+  theme: 'javascript',
+  tags: ['scope'],
+  createdAt: new Date('2026-01-01T08:00:00Z'),
+  updatedAt: new Date('2026-01-01T08:00:00Z'),
+}
+
+type RepoMock = Record<keyof CardRepository, ReturnType<typeof vi.fn>>
+
+function setup() {
+  const repository: RepoMock = {
+    findAll: vi.fn(),
+    findById: vi.fn(),
+    create: vi.fn(),
+    update: vi.fn(),
+    delete: vi.fn(),
+    findRandom: vi.fn(),
+    findRandomByTheme: vi.fn(),
+    findThemes: vi.fn(),
+  }
+  const service = new CardService(repository as unknown as CardRepository)
+  return { service, repository }
+}
+
+describe('CardService', () => {
+  it('list délègue au repository et renvoie toutes les cartes', async () => {
+    const { service, repository } = setup()
+    repository.findAll.mockResolvedValueOnce([CARD])
+    await expect(service.list()).resolves.toEqual([CARD])
+  })
+
+  it('get renvoie la carte quand elle existe', async () => {
+    const { service, repository } = setup()
+    repository.findById.mockResolvedValueOnce(CARD)
+    await expect(service.get(CARD.id)).resolves.toEqual(CARD)
+  })
+
+  it('get lève NotFoundError si la carte est inconnue', async () => {
+    const { service, repository } = setup()
+    repository.findById.mockResolvedValueOnce(null)
+    await expect(service.get('inconnu')).rejects.toThrow(NotFoundError)
+  })
+
+  it('create délègue l entrée au repository', async () => {
+    const { service, repository } = setup()
+    const input = { question: 'Q ?', response: 'R', theme: 'git' }
+    repository.create.mockResolvedValueOnce(CARD)
+    await expect(service.create(input)).resolves.toEqual(CARD)
+    expect(repository.create).toHaveBeenCalledWith(input)
+  })
+
+  it('update renvoie la carte mise à jour', async () => {
+    const { service, repository } = setup()
+    repository.update.mockResolvedValueOnce({ ...CARD, question: 'Nouvelle' })
+    const card = await service.update(CARD.id, { question: 'Nouvelle' })
+    expect(card.question).toBe('Nouvelle')
+  })
+
+  it('update lève NotFoundError si la carte est inconnue', async () => {
+    const { service, repository } = setup()
+    repository.update.mockResolvedValueOnce(null)
+    await expect(service.update('inconnu', { question: 'X' })).rejects.toThrow(NotFoundError)
+  })
+
+  it('remove délègue la suppression', async () => {
+    const { service, repository } = setup()
+    repository.delete.mockResolvedValueOnce(true)
+    await expect(service.remove(CARD.id)).resolves.toBeUndefined()
+    expect(repository.delete).toHaveBeenCalledWith(CARD.id)
+  })
+
+  it('remove lève NotFoundError si aucune carte ne correspond', async () => {
+    const { service, repository } = setup()
+    repository.delete.mockResolvedValueOnce(false)
+    await expect(service.remove('inconnu')).rejects.toThrow(NotFoundError)
+  })
+
+  it('random sans thème utilise findRandom', async () => {
+    const { service, repository } = setup()
+    repository.findRandom.mockResolvedValueOnce(CARD)
+    await expect(service.random()).resolves.toEqual(CARD)
+    expect(repository.findRandomByTheme).not.toHaveBeenCalled()
+  })
+
+  it('random avec thème utilise findRandomByTheme', async () => {
+    const { service, repository } = setup()
+    repository.findRandomByTheme.mockResolvedValueOnce(CARD)
+    await expect(service.random('javascript')).resolves.toEqual(CARD)
+    expect(repository.findRandomByTheme).toHaveBeenCalledWith('javascript')
+  })
+
+  it('random lève NotFoundError si aucune carte', async () => {
+    const { service, repository } = setup()
+    repository.findRandom.mockResolvedValueOnce(null)
+    await expect(service.random()).rejects.toThrow(NotFoundError)
+    repository.findRandomByTheme.mockResolvedValueOnce(null)
+    await expect(service.random('react')).rejects.toThrow('Aucune carte pour le thème react')
+  })
+
+  it('themes renvoie la liste des thèmes', async () => {
+    const { service, repository } = setup()
+    repository.findThemes.mockResolvedValueOnce(['docker', 'git'])
+    await expect(service.themes()).resolves.toEqual(['docker', 'git'])
+  })
+})
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