tests: add tests for constructor using cache control

tests/AnthropicClient.Tests/Unit/Models/ToolResultContentTests.cs

@@ -35,6 +35,43 @@ public class ToolResultContentTests : SerializationTest
     action.Should().Throw<ArgumentNullException>();
   }
 
+  [Fact]
+  public void Constructor_WhenCalledAndGivenCacheControl_ItShouldInitializeProperties()
+  {
+    var toolUseId = Guid.NewGuid().ToString();
+    var content = "content";
+    var cacheControl = new EphemeralCacheControl();
+
+    var actual = new ToolResultContent(toolUseId, content, cacheControl);
+
+    actual.ToolUseId.Should().Be(toolUseId);
+    actual.Content.Should().Be(content);
+    actual.CacheControl.Should().BeSameAs(cacheControl);
+    actual.Type.Should().Be("tool_result");
+  }
+
+  [Fact]
+  public void Constructor_WhenCalledAndGivenCacheControlAndToolUseIdIsNull_ItShouldThrowArgumentNullException()
+  {
+    var content = "content";
+    var cacheControl = new EphemeralCacheControl();
+
+    var action = () => new ToolResultContent(null!, content, cacheControl);
+
+    action.Should().Throw<ArgumentNullException>();
+  }
+
+  [Fact]
+  public void Constructor_WhenCalledAndGivenCacheControlAndContentIsNull_ItShouldThrowArgumentNullException()
+  {
+    var toolUseId = Guid.NewGuid().ToString();
+    var cacheControl = new EphemeralCacheControl();
+
+    var action = () => new ToolResultContent(toolUseId, null!, cacheControl);
+
+    action.Should().Throw<ArgumentNullException>();
+  }
+
   [Fact]
   public void JsonSerialization_WhenSerialized_ItShouldReturnJsonString()
   {
@@ -58,6 +95,34 @@ public class ToolResultContentTests : SerializationTest
     JsonAssert.Equal(expectedJson, actual);
   }
 
+  [Fact]
+  public void JsonSerialization_WhenSerializedWithCacheControl_ItShouldReturnJsonString()
+  {
+    var toolUseId = Guid.NewGuid().ToString();
+    var content = "content";
+    var cacheControl = new EphemeralCacheControl();
+
+    var expectedJson = @$"{{
+      ""tool_use_id"": ""{toolUseId}"",
+      ""content"": ""{content}"",
+      ""type"": ""tool_result"",
+      ""cache_control"": {{
+        ""type"": ""ephemeral""
+      }}
+    }}";
+
+    var toolResultContent = new ToolResultContent
+    {
+      ToolUseId = toolUseId,
+      Content = content,
+      CacheControl = cacheControl
+    };
+
+    var actual = Serialize(toolResultContent);
+
+    JsonAssert.Equal(expectedJson, actual);
+  }
+
   [Fact]
   public void JsonDeserialization_WhenDeserialized_ItShouldReturnToolResultContent()
   {