fix: 保留新建用户选择的部门

- 创建账号时保留表单提交的部门归属

- 补充跨部门创建回归测试

easyflow-api/easyflow-api-admin/src/test/java/tech/easyflow/admin/controller/system/SysAccountControllerTest.java

@@ -0,0 +1,100 @@
+package tech.easyflow.admin.controller.system;
+
+import com.alibaba.fastjson2.JSONObject;
+import com.mybatisflex.core.query.QueryWrapper;
+import org.mockito.ArgumentCaptor;
+import org.mockito.MockedStatic;
+import org.testng.annotations.Test;
+import tech.easyflow.auth.service.AuthCredentialKeyService;
+import tech.easyflow.common.domain.Result;
+import tech.easyflow.common.entity.LoginAccount;
+import tech.easyflow.common.satoken.util.SaTokenUtil;
+import tech.easyflow.system.entity.SysAccount;
+import tech.easyflow.system.service.SysAccountService;
+
+import java.math.BigInteger;
+import java.util.Map;
+
+import static org.mockito.ArgumentMatchers.any;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.mockStatic;
+import static org.mockito.Mockito.verify;
+import static org.mockito.Mockito.when;
+import static org.testng.Assert.assertEquals;
+
+/**
+ * {@link SysAccountController} 创建账号测试。
+ */
+public class SysAccountControllerTest {
+
+    /**
+     * 验证创建用户时保留表单选择的部门，而不是替换为操作者部门。
+     */
+    @Test
+    public void saveShouldKeepSubmittedDepartment() {
+        BigInteger selectedDeptId = BigInteger.valueOf(200);
+        BigInteger operatorDeptId = BigInteger.valueOf(100);
+        BigInteger tenantId = BigInteger.valueOf(300);
+        BigInteger operatorId = BigInteger.valueOf(400);
+        SysAccountService accountService = mock(SysAccountService.class);
+        AuthCredentialKeyService credentialKeyService = mock(AuthCredentialKeyService.class);
+        SysAccountController controller = new SysAccountController(accountService, credentialKeyService);
+        SysAccount entity = createAccount(selectedDeptId);
+        LoginAccount loginAccount = createLoginAccount(operatorId, tenantId, operatorDeptId);
+
+        when(accountService.count(any(QueryWrapper.class))).thenReturn(0L);
+        when(accountService.save(any(SysAccount.class))).thenAnswer(invocation -> {
+            invocation.getArgument(0, SysAccount.class).setId(BigInteger.valueOf(500));
+            return true;
+        });
+        when(credentialKeyService.decryptPayload(any()))
+                .thenReturn(JSONObject.parseObject("{\"password\":\"Valid123!\"}"));
+
+        try (MockedStatic<SaTokenUtil> saToken = mockStatic(SaTokenUtil.class)) {
+            saToken.when(SaTokenUtil::getLoginAccount).thenReturn(loginAccount);
+
+            Result<?> result = controller.save(entity);
+
+            assertEquals(result.getErrorCode(), 0);
+        }
+
+        ArgumentCaptor<SysAccount> accountCaptor = ArgumentCaptor.forClass(SysAccount.class);
+        verify(accountService).save(accountCaptor.capture());
+        SysAccount savedAccount = accountCaptor.getValue();
+        assertEquals(savedAccount.getDeptId(), selectedDeptId);
+        assertEquals(savedAccount.getTenantId(), tenantId);
+        assertEquals(savedAccount.getCreatedBy(), operatorId);
+        assertEquals(savedAccount.getModifiedBy(), operatorId);
+    }
+
+    /**
+     * 构造待创建账号。
+     *
+     * @param deptId 表单选择的部门 ID
+     * @return 待创建账号
+     */
+    private SysAccount createAccount(BigInteger deptId) {
+        SysAccount account = new SysAccount();
+        account.setDeptId(deptId);
+        account.setLoginName("department_test_user");
+        account.setNickname("部门测试用户");
+        account.setPasswordCredential(Map.of("keyId", "test-key"));
+        return account;
+    }
+
+    /**
+     * 构造当前登录账号。
+     *
+     * @param id 操作人 ID
+     * @param tenantId 租户 ID
+     * @param deptId 操作人部门 ID
+     * @return 当前登录账号
+     */
+    private LoginAccount createLoginAccount(BigInteger id, BigInteger tenantId, BigInteger deptId) {
+        LoginAccount account = new LoginAccount();
+        account.setId(id);
+        account.setTenantId(tenantId);
+        account.setDeptId(deptId);
+        return account;
+    }
+}