test: 更改单元测试文件夹名称

[ArgoZhang]

Link issues

fixes #65

Summary By Copilot

Regression?

• Yes
• No

Risk

• High
• Medium
• Low

Verification

• Manual (required)
• Automated

Packaging changes reviewed?

• Yes
• No
• N/A

☑️ Self Check before Merge

⚠️ Please check all items below before review. ⚠️

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• Merge the latest code from the main branch

[Copilot]

Pull Request Overview

This PR adds comprehensive unit test coverage for a Modbus library by introducing a new test project that replaces the previous one. It includes tests for TCP, UDP, RTU, and RTU-over-TCP/UDP Modbus protocols, along with mock implementations for testing purposes.

Key changes:

• New test project structure with xUnit test framework targeting .NET 9.0
• Comprehensive test coverage for all Modbus protocol variants (TCP, UDP, RTU, RTU-over-TCP, RTU-over-UDP)
• Mock implementations for testing Modbus server responses and serial port communication

Reviewed Changes

Copilot reviewed 1 out of 19 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
UnitTestModbus.csproj	New test project configuration with dependencies on xUnit, coverlet, and Microsoft.Extensions.DependencyInjection
UdpClientTest.cs	Tests for UDP Modbus client operations including read/write coils and registers
TcpClientTest.cs	Tests for TCP Modbus client operations including thread safety and error handling
TcpBuilderTest.cs	Tests for TCP message builder validation logic
RtuOverUdpClientTest.cs	Tests for RTU-over-UDP Modbus client operations
RtuOverTcpClientTest.cs	Tests for RTU-over-TCP Modbus client operations
RtuClientTest.cs	Tests for RTU Modbus client operations using serial port
RtuBuilderTest.cs	Tests for RTU message builder validation logic
MockUdpModbus.cs	Mock UDP Modbus server implementation for testing
MockTcpResponse.cs	Helper methods to generate mock TCP Modbus responses
MockTcpModbus.cs	Mock TCP Modbus server implementation for testing
MockRtuResponse.cs	Helper methods to generate mock RTU Modbus responses
MockRtuOverUdpModbus.cs	Mock RTU-over-UDP Modbus server implementation for testing
MockRtuOverTcpModbus.cs	Mock RTU-over-TCP Modbus server implementation for testing
MockRtuClient.cs	Mock serial port client implementation for RTU testing
BuilderTest.cs	Tests for message builder validation methods
ModbusCrcTest.cs	Tests for Modbus CRC-16 computation and validation
Assembly.cs	Assembly-level attribute to exclude tests from code coverage
Longbow.Modbus.slnx	Updated solution file to reference the new test project

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