test: add test coverage for SyncMcpToolCallback.Builder

mcp/common/src/test/java/org/springframework/ai/mcp/SyncMcpToolCallbackBuilderTest.java

@@ -123,4 +123,95 @@ void builderShouldSupportMethodChaining() {
 		assertThat(callback.getToolDefinition().name()).isEqualTo("chained_tool_name");
 	}
 
+	@Test
+	void builderShouldNormalizeToolNameWithSpecialCharacters() {
+		McpSyncClient mcpClient = Mockito.mock(McpSyncClient.class);
+		McpSchema.Implementation clientInfo = new McpSchema.Implementation("test-client", "1.0.0");
+		when(mcpClient.getClientInfo()).thenReturn(clientInfo);
+
+		Tool tool = Mockito.mock(Tool.class);
+		when(tool.name()).thenReturn("test-tool-with-dashes");
+		when(tool.description()).thenReturn("Test description");
+
+		SyncMcpToolCallback callback = SyncMcpToolCallback.builder().mcpClient(mcpClient).tool(tool).build();
+
+		assertThat(callback.getOriginalToolName()).isEqualTo("test-tool-with-dashes");
+		assertThat(callback.getToolDefinition().name()).isEqualTo("test_tool_with_dashes");
+	}
+
+	@Test
+	void builderShouldUseCustomPrefixedNameWithoutNormalization() {
+		McpSyncClient mcpClient = Mockito.mock(McpSyncClient.class);
+
+		Tool tool = Mockito.mock(Tool.class);
+		when(tool.name()).thenReturn("original-name");
+		when(tool.description()).thenReturn("Test description");
+
+		String customName = "custom-name-with-dashes";
+
+		SyncMcpToolCallback callback = SyncMcpToolCallback.builder()
+			.mcpClient(mcpClient)
+			.tool(tool)
+			.prefixedToolName(customName)
+			.build();
+
+		assertThat(callback.getOriginalToolName()).isEqualTo("original-name");
+		assertThat(callback.getToolDefinition().name()).isEqualTo(customName);
+	}
+
+	@Test
+	void builderShouldHandlePrefixedToolNameAsNull() {
+		McpSyncClient mcpClient = Mockito.mock(McpSyncClient.class);
+		McpSchema.Implementation clientInfo = new McpSchema.Implementation("test-client", "1.0.0");
+		when(mcpClient.getClientInfo()).thenReturn(clientInfo);
+
+		Tool tool = Mockito.mock(Tool.class);
+		when(tool.name()).thenReturn("test-tool");
+		when(tool.description()).thenReturn("Description");
+
+		SyncMcpToolCallback callback = SyncMcpToolCallback.builder()
+			.mcpClient(mcpClient)
+			.tool(tool)
+			.prefixedToolName(null)
+			.build();
+
+		// When null, it should use the default normalized name
+		assertThat(callback).isNotNull();
+		assertThat(callback.getToolDefinition().name()).isEqualTo("test_tool");
+	}
+
+	@Test
+	void builderShouldCreateNewInstancesForEachBuild() {
+		McpSyncClient mcpClient = Mockito.mock(McpSyncClient.class);
+		McpSchema.Implementation clientInfo = new McpSchema.Implementation("test-client", "1.0.0");
+		when(mcpClient.getClientInfo()).thenReturn(clientInfo);
+
+		Tool tool = Mockito.mock(Tool.class);
+		when(tool.name()).thenReturn("test-tool");
+		when(tool.description()).thenReturn("Test description");
+
+		SyncMcpToolCallback.Builder builder = SyncMcpToolCallback.builder().mcpClient(mcpClient).tool(tool);
+
+		SyncMcpToolCallback callback1 = builder.build();
+		SyncMcpToolCallback callback2 = builder.build();
+
+		assertThat(callback1).isNotSameAs(callback2);
+		assertThat(callback1.getOriginalToolName()).isEqualTo(callback2.getOriginalToolName());
+	}
+
+	@Test
+	void builderShouldThrowExceptionWhenToolContextConverterIsNull() {
+		McpSyncClient mcpClient = Mockito.mock(McpSyncClient.class);
+		Tool tool = Mockito.mock(Tool.class);
+		when(tool.name()).thenReturn("test-tool");
+		when(tool.description()).thenReturn("Test description");
+
+		assertThatThrownBy(() -> SyncMcpToolCallback.builder()
+			.mcpClient(mcpClient)
+			.tool(tool)
+			.toolContextToMcpMetaConverter(null)
+			.build()).isInstanceOf(IllegalArgumentException.class)
+			.hasMessage("ToolContextToMcpMetaConverter must not be null");
+	}
+
 }