diff --git a/src/main/java/com/nirzara/paymenttracker/controller/PaymentController.test.java b/src/main/java/com/nirzara/paymenttracker/controller/PaymentController.test.java
new file mode 100644
index 0000000..1de5f18
--- /dev/null
+++ b/src/main/java/com/nirzara/paymenttracker/controller/PaymentController.test.java
@@ -0,0 +1,51 @@
+package com.nirzara.paymenttracker.controller;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.nirzara.paymenttracker.model.Payment;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.ExtendWith;
+import org.mockito.InjectMocks;
+import org.mockito.Mock;
+import org.mockito.junit.jupiter.MockitoExtension;
+import org.springframework.http.MediaType;
+import org.springframework.test.web.servlet.MockMvc;
+import org.springframework.test.web.servlet.setup.MockMvcBuilders;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.mockito.Mockito.when;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.post;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.content;
+
+@ExtendWith(MockitoExtension.class)
+public class PaymentControllerTest {
+
+    @Mock
+    private PaymentService paymentService;
+
+    @InjectMocks
+    private PaymentController paymentController;
+
+    private MockMvc mockMvc;
+
+    private ObjectMapper objectMapper = new ObjectMapper();
+
+    @Test
+    public void testAddPayment_InvalidPayment() throws Exception {
+        // Arrange
+        Payment payment = new Payment();
+        payment.setAmount(-10.0);
+        payment.setDescription("Invalid Payment");
+        String json = objectMapper.writeValueAsString(payment);
+
+        when(paymentService.addPayment(payment)).thenThrow(new IllegalArgumentException("Invalid payment amount"));
+
+        mockMvc = MockMvcBuilders.standaloneSetup(paymentController).build();
+
+        // Act & Assert
+        mockMvc.perform(post("/payments")
+                .contentType(MediaType.APPLICATION_JSON)
+                .content(json))
+                .andExpect(status().isBadRequest());
+    }
+}
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