fix

WebApi.Test/Application/TransactionCategoryApplicationTest.cs

@@ -441,4 +441,82 @@ public class TransactionCategoryApplicationTest : BaseApplicationTest
     }
 
     #endregion
+
+    #region DeleteIconAsync Tests
+
+    [Fact]
+    public async Task DeleteIconAsync_存在的分类_应成功删除图标()
+    {
+        // Arrange
+        var category = new TransactionCategory
+        {
+            Id = 1,
+            Name = "测试",
+            Type = TransactionType.Expense,
+            Icon = """["<svg>icon1</svg>","<svg>icon2</svg>"]"""
+        };
+        _categoryRepository.GetByIdAsync(1).Returns(category);
+        _categoryRepository.UpdateAsync(Arg.Any<TransactionCategory>()).Returns(true);
+
+        // Act
+        await _application.DeleteIconAsync(1);
+
+        // Assert
+        await _categoryRepository.Received(1).UpdateAsync(Arg.Is<TransactionCategory>(
+            c => c.Id == 1 && c.Icon == null
+        ));
+    }
+
+    [Fact]
+    public async Task DeleteIconAsync_分类不存在_应抛出NotFoundException()
+    {
+        // Arrange
+        _categoryRepository.GetByIdAsync(999).Returns((TransactionCategory?)null);
+
+        // Act & Assert
+        await Assert.ThrowsAsync<NotFoundException>(() => _application.DeleteIconAsync(999));
+    }
+
+    [Fact]
+    public async Task DeleteIconAsync_更新失败_应抛出BusinessException()
+    {
+        // Arrange
+        var category = new TransactionCategory
+        {
+            Id = 1,
+            Name = "测试",
+            Type = TransactionType.Expense,
+            Icon = """["<svg>icon1</svg>"]"""
+        };
+        _categoryRepository.GetByIdAsync(1).Returns(category);
+        _categoryRepository.UpdateAsync(Arg.Any<TransactionCategory>()).Returns(false);
+
+        // Act & Assert
+        await Assert.ThrowsAsync<BusinessException>(() => _application.DeleteIconAsync(1));
+    }
+
+    [Fact]
+    public async Task DeleteIconAsync_无图标的分类_应成功()
+    {
+        // Arrange
+        var category = new TransactionCategory
+        {
+            Id = 1,
+            Name = "测试",
+            Type = TransactionType.Expense,
+            Icon = null
+        };
+        _categoryRepository.GetByIdAsync(1).Returns(category);
+        _categoryRepository.UpdateAsync(Arg.Any<TransactionCategory>()).Returns(true);
+
+        // Act
+        await _application.DeleteIconAsync(1);
+
+        // Assert
+        await _categoryRepository.Received(1).UpdateAsync(Arg.Is<TransactionCategory>(
+            c => c.Id == 1 && c.Icon == null
+        ));
+    }
+
+    #endregion
 }