diff --git a/src/__tests__/app.test.ts b/src/__tests__/app.test.ts
index 5aa7fa5..15cecb9 100644
--- a/src/__tests__/app.test.ts
+++ b/src/__tests__/app.test.ts
@@ -1,6 +1,8 @@
 import { initServer } from '../app.js'
 import request from 'supertest'
 import { PrismaClient } from '@prisma/client'
+import bcrypt from 'bcrypt'
+import { equals } from '@jest/expect-utils'
 
 const prisma = new PrismaClient()
 const app = initServer()
@@ -11,9 +13,23 @@ const testUserCredentials = {
     password: "aaaaaaaaaa"
 }
 
+beforeAll(async () => {
+    await prisma.user.create({
+        data: {
+            email: testUserCredentials.email,
+            password: await bcrypt.hash(testUserCredentials.password, 10),
+            name: '',
+            picture_path: ''
+        }
+    })
+})
+
 afterAll(async () => {
     await prisma.user.delete({
-        where: { email: "a@a.com" }
+        where: { email: testUserCredentials.email }
+    })
+    await prisma.user.delete({
+        where: { email: 'b@b.com' }
     })
 })
 
@@ -32,11 +48,24 @@ describe('POST /v1/session/register', () => {
         const res = await request(app)
             .post('/v1/session/register')
             .set('Content-Type', 'application/json')
-            .send(JSON.stringify(testUserCredentials))
+            .send(JSON.stringify({
+                email: 'b@b.com',
+                password: 'bbbbbbbbbbb'
+            }))
 
         expect(res.statusCode).toEqual(200)
         expect(res.body).toHaveProperty('message')
     })
+
+    it('returns status code 400 and an error message', async () => {
+        const res = await request(app)
+            .post('/v1/session/register')
+            .set('Content-Type', 'application/json')
+            .send(JSON.stringify(testUserCredentials))
+
+        expect(res.statusCode).toEqual(400)
+        expect(res.body).toHaveProperty('message')
+    })
 })
 
 describe('POST /v1/session/login', () => {
@@ -53,6 +82,75 @@ describe('POST /v1/session/login', () => {
         expect(res.statusCode).toEqual(200)
         expect(jwtCookie).not.toBe(undefined)
     })
+
+    it('returns status code 400 and credentials error message', async () => {
+        const res = await request(app)
+            .post('/v1/session/login')
+            .set('Content-Type', 'application/json')
+            .send(JSON.stringify({
+                email: 'rip bozo',
+                password: 'rip bozo'
+            }))
+
+        expect(res.statusCode).toEqual(400)
+        expect(res.body).toHaveProperty('message')
+    })
+})
+
+describe('POST /v1/category', () => {
+    it('returns status code 200 and success message', async () => {
+        const res = await request(app)
+            .post('/v1/category')
+            .set('Content-Type', 'application/json')
+            .set('Cookie', jwtCookie as string)
+            .send(JSON.stringify({
+                name: 'VueJS Composition API'
+            }))
+
+        expect(res.status).toEqual(200)
+        expect(res.body).toHaveProperty('message')
+    })
+
+    it('returns status code 400 and error message', async () => {
+        const res = await request(app)
+            .post('/v1/category')
+            .set('Content-Type', 'application/json')
+            .set('Cookie', jwtCookie as string)
+            .send(JSON.stringify({
+                pouet: 'VueJS Composition API'
+            }))
+
+        expect(res.status).toEqual(400)
+        expect(res.body).toHaveProperty('message')
+    })
+})
+
+describe('GET /v1/category', () => {
+    it('returns status code 200 and the category created', async () => {
+        const res = await request(app)
+            .get('/v1/category')
+            .set('Content-Type', 'application/json')
+            .set('Cookie', jwtCookie as string)
+            .send(JSON.stringify({
+                name: 'VueJS Composition API'
+            }))
+
+        expect(res.status).toEqual(200)
+        expect(res.body).toHaveProperty('category')
+    })
+
+    it('returns status code 400 and error message', async () => {
+        const res = await request(app)
+            .post('/v1/category')
+            .set('Content-Type', 'application/json')
+            .set('Cookie', jwtCookie as string)
+            .send(JSON.stringify({
+                pouet: 'VueJS Composition API'
+            }))
+
+        expect(res.status).toEqual(400)
+        expect(res.body).toHaveProperty('message')
+    })
 })
 
 describe('PUT /v1/user', () => {