diff --git a/proj-acquirex/src/test/java/com/acquirex/approval/CardAcquisitionApprovalServiceTest.java b/proj-acquirex/src/test/java/com/acquirex/approval/CardAcquisitionApprovalServiceTest.java
new file mode 100644
index 0000000..db245b2
--- /dev/null
+++ b/proj-acquirex/src/test/java/com/acquirex/approval/CardAcquisitionApprovalServiceTest.java
@@ -0,0 +1,80 @@
+package com.acquirex.approval;
+
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+
+import java.math.BigDecimal;
+
+import static org.junit.jupiter.api.Assertions.*;
+
+@DisplayName("카드 매입 승인 서비스 테스트")
+class CardAcquisitionApprovalServiceTest {
+
+    private CardAcquisitionApprovalService approvalService;
+
+    @BeforeEach
+    void setUp() {
+        approvalService = new CardAcquisitionApprovalService();
+    }
+
+    @Test
+    @DisplayName("소액 거래 승인 처리 성공")
+    void testSmallAmountApproval() {
+        CardAcquisitionApprovalRequest request = CardAcquisitionApprovalRequest.builder()
+                .merchantId("MERCHANT001")
+                .cardCompanyCode("CARD001")
+                .transactionAmount(new BigDecimal("50000"))
+                .transactionType("PURCHASE")
+                .build();
+
+        CardAcquisitionApprovalResponse response = approvalService.processApproval(request);
+
+        assertNotNull(response);
+        assertNotNull(response.getApprovalId());
+        assertTrue(response.getApprovalId().startsWith("APR-"));
+        assertEquals("MERCHANT001", response.getMerchantId());
+        assertEquals(CardAcquisitionApprovalStatus.APPROVED, response.getStatus());
+        assertEquals("0000", response.getResponseCode());
+    }
+
+    @Test
+    @DisplayName("대액 거래 처리 중 상태")
+    void testLargeAmountProcessing() {
+        CardAcquisitionApprovalRequest request = CardAcquisitionApprovalRequest.builder()
+                .merchantId("MERCHANT002")
+                .cardCompanyCode("CARD002")
+                .transactionAmount(new BigDecimal("150000"))
+                .transactionType("PURCHASE")
+                .build();
+
+        CardAcquisitionApprovalResponse response = approvalService.processApproval(request);
+
+        assertNotNull(response);
+        assertEquals(CardAcquisitionApprovalStatus.PROCESSING, response.getStatus());
+    }
+
+    @Test
+    @DisplayName("승인 상태 조회 성공")
+    void testGetApprovalStatus() {
+        CardAcquisitionApprovalRequest request = CardAcquisitionApprovalRequest.builder()
+                .merchantId("MERCHANT003")
+                .cardCompanyCode("CARD003")
+                .transactionAmount(new BigDecimal("30000"))
+                .transactionType("PURCHASE")
+                .build();
+
+        CardAcquisitionApprovalResponse created = approvalService.processApproval(request);
+        CardAcquisitionApprovalResponse found = approvalService.getApprovalStatus(created.getApprovalId());
+
+        assertNotNull(found);
+        assertEquals(created.getApprovalId(), found.getApprovalId());
+    }
+
+    @Test
+    @DisplayName("존재하지 않는 승인 ID 조회 시 null 반환")
+    void testGetNonExistentApproval() {
+        CardAcquisitionApprovalResponse response = approvalService.getApprovalStatus("APR-NONEXIST");
+        assertNull(response);
+    }
+}