添加新测试

backend/src/test/java/com/yoyuzh/common/GlobalExceptionHandlerTest.java

@@ -0,0 +1,119 @@
+package com.yoyuzh.common;
+
+import jakarta.validation.ConstraintViolation;
+import jakarta.validation.ConstraintViolationException;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.mock.web.MockHttpServletRequest;
+import org.springframework.security.access.AccessDeniedException;
+import org.springframework.security.authentication.BadCredentialsException;
+import org.springframework.validation.BeanPropertyBindingResult;
+import org.springframework.validation.FieldError;
+import org.springframework.web.bind.MethodArgumentNotValidException;
+
+import java.util.Set;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+class GlobalExceptionHandlerTest {
+
+    private GlobalExceptionHandler handler;
+
+    @BeforeEach
+    void setUp() {
+        handler = new GlobalExceptionHandler();
+    }
+
+    @Test
+    void shouldReturn400ForUnknownBusinessException() {
+        BusinessException ex = new BusinessException(ErrorCode.UNKNOWN, "操作失败");
+        ResponseEntity<ApiResponse<Void>> response = handler.handleBusinessException(ex);
+        assertThat(response.getStatusCode()).isEqualTo(HttpStatus.BAD_REQUEST);
+        assertThat(response.getBody().msg()).isEqualTo("操作失败");
+    }
+
+    @Test
+    void shouldReturn401ForNotLoggedInException() {
+        BusinessException ex = new BusinessException(ErrorCode.NOT_LOGGED_IN, "未登录");
+        ResponseEntity<ApiResponse<Void>> response = handler.handleBusinessException(ex);
+        assertThat(response.getStatusCode()).isEqualTo(HttpStatus.UNAUTHORIZED);
+    }
+
+    @Test
+    void shouldReturn403ForPermissionDeniedException() {
+        BusinessException ex = new BusinessException(ErrorCode.PERMISSION_DENIED, "无权限");
+        ResponseEntity<ApiResponse<Void>> response = handler.handleBusinessException(ex);
+        assertThat(response.getStatusCode()).isEqualTo(HttpStatus.FORBIDDEN);
+    }
+
+    @Test
+    void shouldReturn404ForFileNotFoundException() {
+        BusinessException ex = new BusinessException(ErrorCode.FILE_NOT_FOUND, "文件不存在");
+        ResponseEntity<ApiResponse<Void>> response = handler.handleBusinessException(ex);
+        assertThat(response.getStatusCode()).isEqualTo(HttpStatus.NOT_FOUND);
+    }
+
+    @Test
+    void shouldReturn400WithFirstValidationMessageForMethodArgumentNotValidException() throws Exception {
+        BeanPropertyBindingResult bindingResult = new BeanPropertyBindingResult(new Object(), "target");
+        bindingResult.addError(new FieldError("target", "username", "用户名不能为空"));
+        bindingResult.addError(new FieldError("target", "email", "邮箱格式不正确"));
+        MethodArgumentNotValidException ex = new MethodArgumentNotValidException(null, bindingResult);
+
+        ResponseEntity<ApiResponse<Void>> response = handler.handleValidationException(ex);
+
+        assertThat(response.getStatusCode()).isEqualTo(HttpStatus.BAD_REQUEST);
+        assertThat(response.getBody().msg()).isEqualTo("用户名不能为空");
+    }
+
+    @Test
+    void shouldReturn400WithDefaultMessageWhenNoValidationMessages() throws Exception {
+        BeanPropertyBindingResult bindingResult = new BeanPropertyBindingResult(new Object(), "target");
+        MethodArgumentNotValidException ex = new MethodArgumentNotValidException(null, bindingResult);
+
+        ResponseEntity<ApiResponse<Void>> response = handler.handleValidationException(ex);
+
+        assertThat(response.getStatusCode()).isEqualTo(HttpStatus.BAD_REQUEST);
+        assertThat(response.getBody().msg()).isEqualTo("请求参数不合法");
+    }
+
+    @Test
+    void shouldReturn400ForConstraintViolationException() {
+        ConstraintViolation<?> violation = mock(ConstraintViolation.class);
+        when(violation.getMessage()).thenReturn("密码不能为空");
+        ConstraintViolationException ex = new ConstraintViolationException(Set.of(violation));
+
+        ResponseEntity<ApiResponse<Void>> response = handler.handleValidationException(ex);
+
+        assertThat(response.getStatusCode()).isEqualTo(HttpStatus.BAD_REQUEST);
+        assertThat(response.getBody().msg()).isEqualTo("密码不能为空");
+    }
+
+    @Test
+    void shouldReturn403ForAccessDeniedException() {
+        AccessDeniedException ex = new AccessDeniedException("forbidden");
+        ResponseEntity<ApiResponse<Void>> response = handler.handleAccessDenied(ex);
+        assertThat(response.getStatusCode()).isEqualTo(HttpStatus.FORBIDDEN);
+        assertThat(response.getBody().msg()).isEqualTo("没有权限访问该资源");
+    }
+
+    @Test
+    void shouldReturn401ForBadCredentialsException() {
+        BadCredentialsException ex = new BadCredentialsException("bad credentials");
+        ResponseEntity<ApiResponse<Void>> response = handler.handleBadCredentials(ex);
+        assertThat(response.getStatusCode()).isEqualTo(HttpStatus.UNAUTHORIZED);
+        assertThat(response.getBody().msg()).isEqualTo("用户名或密码错误");
+    }
+
+    @Test
+    void shouldReturn500ForUnhandledException() {
+        RuntimeException ex = new RuntimeException("unexpected");
+        ResponseEntity<ApiResponse<Void>> response = handler.handleUnknown(ex);
+        assertThat(response.getStatusCode()).isEqualTo(HttpStatus.INTERNAL_SERVER_ERROR);
+        assertThat(response.getBody().msg()).isEqualTo("服务器内部错误");
+    }
+}