diff --git a/API-Project/src/controllers/ingredients.controller.ts b/API-Project/src/controllers/ingredients.controller.ts
index b4a6094..900bbc5 100644
--- a/API-Project/src/controllers/ingredients.controller.ts
+++ b/API-Project/src/controllers/ingredients.controller.ts
@@ -8,14 +8,15 @@ const ingredient_gw = new IngredientsGateway()
 
 
 IngredientsController.get('/filter/:prompt', async (req, res) => {
-    const letter = req.params.prompt;
+    const prompt = req.params.prompt;
 
-        if (!letter) {
-            throw new Exceptions.BadRequestException('prompt is invalid!');
-        }
+    if (!prompt) {
+        res.status(400).send('invalid parameter or no parameter')
+        return
+    }
 
     try {
-        const ingredient = await ingredient_gw.filter(letter);
+        const ingredient = await ingredient_gw.filter(prompt);
 
         if (ingredient == null) {
             res.status(404).send('Not found');
@@ -31,9 +32,10 @@ IngredientsController.get('/filter/:prompt', async (req, res) => {
 IngredientsController.get('/letter/:letter', async (req, res) => {
     const letter = req.params.letter;
 
-        if (!letter) {
-            throw new Exceptions.BadRequestException('Letter is invalid!');
-        }
+    if (!letter) {
+        res.status(400).send('invalid parameter or no parameter')
+        return
+    }
 
     try {
         const ingredient = await ingredient_gw.getByLetter(letter);
diff --git a/API-Project/src/server.ts b/API-Project/src/server.ts
index 95bea7a..acbe17e 100644
--- a/API-Project/src/server.ts
+++ b/API-Project/src/server.ts
@@ -22,15 +22,15 @@ app.use('/ingredients', IngredientsController);
 app.use('/recipes', RecipesController);
 app.use('/steps', StepsController);
 
-const port = process.env.PORT || 3000;
+const port = Number(process.env.PORT) || 3000;
 
-export const startServer = () => {
-  return app.listen(port, () => console.log(`App listening on PORT ${port}`));
+export const startServer = (port_to_use: number) => {
+  return app.listen(port_to_use, () => console.log(`App listening on PORT ${port}`));
 };
 
 // Exécutez le serveur uniquement si le module est le point d'entrée principal
 if (require.main === module) {
-  startServer();
+  startServer(port);
 }
 
 export default app;
diff --git a/API-Project/tests/app.spec.ts b/API-Project/tests/app.spec.ts
index 187765b..ac77852 100644
--- a/API-Project/tests/app.spec.ts
+++ b/API-Project/tests/app.spec.ts
@@ -4,9 +4,10 @@ import { Server, IncomingMessage, ServerResponse } from 'http';
 
 describe('GET /api/endpoint', () => {
     let server: Server<typeof IncomingMessage, typeof ServerResponse>;
+    const port = 3000
     
     beforeAll(() => {
-        server = startServer();
+        server = startServer(3000);
     });
 
     afterAll((done) => {
diff --git a/API-Project/tests/ingredients.spec.ts b/API-Project/tests/ingredients.spec.ts
index a4da5ac..0c46bc3 100644
--- a/API-Project/tests/ingredients.spec.ts
+++ b/API-Project/tests/ingredients.spec.ts
@@ -5,32 +5,67 @@ import { Server, IncomingMessage, ServerResponse } from 'http';
 
 describe('GET /ingredients', () => {
     let server: Server<typeof IncomingMessage, typeof ServerResponse>;
-  
+    const port = 3001
+
     beforeAll(() => {
-      server = startServer();
+        server = startServer(3001);
     });
   
     afterAll((done) => {
-      server.close(done);
+        server.close(done);
     });
-  it('should return a 200 status code', async () => {
-    const response = await request(app).get('/ingredients/');
-    expect(response.status).toBe(200);
-  });
 
-  it('should return a 200 status code', async () => {
-    const response = await request(app).get('/ingredients/1');
-    expect(response.status).toBe(200);
-  });
-  
-  it('should return a 400 status code', async () => {
-    const response = await request(app).get('/ingredients/l');
-    expect(response.status).toBe(400);
-  });
+    // /ingredients/
+    it('should return a 200 status code', async () => {
+        const response = await request(app).get('/ingredients/');
+        expect(response.status).toBe(200);
+    });
+
+    // /ingredients/:id
+    it('should return a 200 status code', async () => {
+        const response = await request(app).get('/ingredients/1');
+        expect(response.status).toBe(200);
+    });
+    
+    it('should return a 400 status code', async () => {
+        const response = await request(app).get('/ingredients/l');
+        expect(response.status).toBe(400);
+    });
 
-  it('should return a 404 status code', async () => {
-    const response = await request(app).get('/ingredients/8024');
-    expect(response.status).toBe(404);
-  });
+    it('should return a 404 status code', async () => {
+        const response = await request(app).get('/ingredients/8024');
+        expect(response.status).toBe(404);
+    });
+
+    // /ingredients/letter/:letter
+    it('should return a 200 status code', async () => {
+        const response = await request(app).get('/ingredients/letter/l');
+        expect(response.status).toBe(200);
+    });
 
+    it('should return a 404 status code', async () => {
+        const response = await request(app).get('/ingredients/letter/oui');
+        expect(response.status).toBe(404);
+    });
+
+    it('should return a 400 status code', async () => {
+        const response = await request(app).get('/ingredients/letter/');
+        expect(response.status).toBe(400);
+    });
+
+    // /ingredients/filter/:prompt
+    it('should return a 200 status code', async () => {
+        const response = await request(app).get('/ingredients/filter/car');
+        expect(response.status).toBe(200);
+    });
+
+    it('should return a 404 status code', async () => {
+        const response = await request(app).get('/ingredients/filter/slumaprottube');
+        expect(response.status).toBe(404);
+    });
+
+    it('should return a 400 status code', async () => {
+        const response = await request(app).get('/ingredients/filter/');
+        expect(response.status).toBe(400);
+    });
 });
\ No newline at end of file