diff --git a/test/integration/app.test.js b/test/integration/app.test.js
index 506e859..67f6552 100644
--- a/test/integration/app.test.js
+++ b/test/integration/app.test.js
@@ -14,4 +14,40 @@ describe("Calculate", () => {
         expect(response.status).toBe(200)
         expect(response.body).toBe(JSON.stringify({ result: 30 }))
     })
+
+    it('POST /calculate: action: multiply', async () => {
+        const response = await supertest(server).post('/calculate').send({
+            action: 'multiply',
+            num1: 20,
+            num2: 10
+        })
+
+        // console.log({response})
+        expect(response.status).toBe(200)
+        expect(response.text).toBe(JSON.stringify({ result: 200 }))
+    })
+
+    it('POST /calculate: action: subtract', async () => {
+        const response = await supertest(server).post('/calculate').send({
+            action: 'subtract',
+            num1: 20,
+            num2: 10
+        })
+
+        // console.log({response})
+        expect(response.status).toBe(200)
+        expect(response.text).toBe(JSON.stringify({ result: 10 }))
+    })
+
+    it('POST /calculate: action: divide', async () => {
+        const response = await supertest(server).post('/calculate').send({
+            action: 'divide',
+            num1: 20,
+            num2: 10
+        })
+
+        // console.log({response})
+        expect(response.status).toBe(200)
+        expect(response.text).toBe(JSON.stringify({ result: 2 }))
+    })
 })
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