최재영 과제 1차 제출

cjy/build.gradle

@@ -23,6 +23,10 @@ dependencies {
 	compileOnly 'org.projectlombok:lombok'
 	annotationProcessor 'org.projectlombok:lombok'
 	testImplementation 'org.springframework.boot:spring-boot-starter-test'
+
+	//openFeign
+	implementation group: 'org.springframework.cloud', name: 'spring-cloud-starter-openfeign', version: '3.1.3'
+
 }
 
 tasks.named('test') {

cjy/src/main/java/com/study/cjy/CjyApplication.java

@@ -2,8 +2,10 @@
 
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.cloud.openfeign.EnableFeignClients;
 
 @SpringBootApplication
+@EnableFeignClients
 public class CjyApplication {
 
 	public static void main(String[] args) {

cjy/src/main/java/com/study/cjy/CjyController.java

@@ -0,0 +1,20 @@
+package com.study.cjy;
+
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("/api")
+@RequiredArgsConstructor
+public class CjyController {
+    private final CjyService cjyService;
+
+    @GetMapping("/getNum")
+    public ResponseEntity<ResponseDto> getNum() {
+        ResponseDto result = cjyService.algorithm();
+        return ResponseEntity.ok(result);
+    }
+}

cjy/src/main/java/com/study/cjy/CjyService.java

@@ -0,0 +1,19 @@
+package com.study.cjy;
+
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+
+@Service
+@RequiredArgsConstructor
+public class CjyService {
+    private final YkOpenFeign openFeign;
+    public ResponseDto algorithm() {
+        int xIsOne = openFeign.getResult(1);
+        int xIsTwo = openFeign.getResult(2);
+
+        int a = (xIsTwo - 2 * xIsOne) / 2;
+        int b = xIsOne - a;
+
+        return ResponseDto.of(a, b);
+    }
+}

cjy/src/main/java/com/study/cjy/ResponseDto.java

@@ -0,0 +1,17 @@
+package com.study.cjy;
+
+import lombok.AccessLevel;
+import lombok.AllArgsConstructor;
+import lombok.Getter;
+
+@AllArgsConstructor(access = AccessLevel.PRIVATE)
+@Getter
+public class ResponseDto {
+    private int a;
+    private int b;
+
+    public static ResponseDto of(int a, int b) {
+        ResponseDto responseDto = new ResponseDto(a, b);
+        return responseDto;
+    }
+}

cjy/src/main/java/com/study/cjy/YkOpenFeign.java

@@ -0,0 +1,11 @@
+package com.study.cjy;
+
+import org.springframework.cloud.openfeign.FeignClient;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+
+@FeignClient(name = "YkOpenFeign", url = "http://localhost:8081")
+public interface YkOpenFeign {
+    @GetMapping("/api/cal/{x}")
+    int getResult(@PathVariable("x") int x);
+}

cjy/src/test/java/com/study/cjy/CjyServiceTest.java

@@ -0,0 +1,33 @@
+package com.study.cjy;
+
+import org.junit.jupiter.api.DisplayName;
+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 static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.Mockito.when;
+
+@ExtendWith(MockitoExtension.class)
+class CjyServiceTest {
+
+    @InjectMocks
+    CjyService cjyService;
+
+    @Mock
+    YkOpenFeign ykOpenFeign;
+
+    @Test
+    @DisplayName("과제1 서비스 코드 테스트")
+    void test1() {
+        when(ykOpenFeign.getResult(1)).thenReturn(2); // a + b = 2
+        when(ykOpenFeign.getResult(2)).thenReturn(6); // 4a + 2b = 6
+
+        ResponseDto responseDto = cjyService.algorithm();
+
+        assertThat(responseDto.getA()).isEqualTo(1);
+        assertThat(responseDto.getB()).isEqualTo(1);
+    }
+}