diff --git a/test/integration/app.test.js b/test/integration/app.test.js
index 506e859..1e10c64 100644
--- a/test/integration/app.test.js
+++ b/test/integration/app.test.js
@@ -12,6 +12,39 @@ describe("Calculate", () => {
 
         // console.log({response})
         expect(response.status).toBe(200)
-        expect(response.body).toBe(JSON.stringify({ result: 30 }))
+        expect(response.text).toBe(JSON.stringify({ result: 30 }))
     })
-})
\ No newline at end of file
+    it('POST /calculate: action: division', async () => {
+        const response = await supertest(server).post('/calculate').send({
+            action: 'divide',
+            num1: 20,
+            num2: 4
+        })
+
+        // console.log({response})
+        expect(response.status).toBe(200)
+        expect(response.text).toBe(JSON.stringify({ result: 5 }))
+    })
+    it('POST /calculate: action: multiplication', async () => {
+        const response = await supertest(server).post('/calculate').send({
+            action: 'multiply',
+            num1: 12,
+            num2: 5
+        })
+
+        // console.log({response})
+        expect(response.status).toBe(200)
+        expect(response.text).toBe(JSON.stringify({ result: 60 }))
+    })
+    it('POST /calculate: action: subtraction', async () => {
+        const response = await supertest(server).post('/calculate').send({
+            action: 'subtract',
+            num1: 25,
+            num2: 13
+        })
+
+        // console.log({response})
+        expect(response.status).toBe(200)
+        expect(response.text).toBe(JSON.stringify({ result: 12 }))
+    })
+})