Add validation for Server parameter binding

[PrzemyslawKlys]

Summary

• convert the Resolve-Dns Server parameter to a validated auto-property while preserving the existing alias
• add a Pester binding test to ensure the Server parameter metadata and null handling are enforced

Testing

• dotnet build DnsClientX.sln
• pwsh -NoLogo -NoProfile -Command "Invoke-Pester -Path './Module/Tests/ResolveDnsBinding.Tests.ps1' -Output Detailed"

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Codex Task

[claude]

Claude finished @PrzemyslawKlys's task —— View job

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PR Review Analysis

I've thoroughly reviewed this pull request and found the implementation to be well-executed with good defensive programming practices.

Todo List:

• Read and analyze the modified C# cmdlet file
• Read and analyze the new Pester test file
• Review code quality and best practices
• Check for potential bugs or issues
• Evaluate performance considerations
• Assess security concerns
• Review test coverage adequacy
• Provide comprehensive feedback

✅ Code Quality & Best Practices

Excellent implementation:

• Clean conversion to auto-property: The change from backing field to auto-property with validation at DnsClientX.PowerShell/CmdletResolveDnsQuery.cs:93 is properly implemented
• Preserved backward compatibility: The [Alias("ServerName")] is correctly maintained
• Proper validation attribute: [ValidateNotNull] is the right choice for preventing null binding
• Consistent initialization: = new List<string>() provides proper default empty list

✅ Potential Bugs/Issues

No issues found:

• The validation attribute will properly prevent null parameter binding at the PowerShell level
• Existing null checks in the processing logic (line 353, 443) remain as defensive programming
• The auto-property maintains the same public interface and behavior

✅ Performance Considerations

No concerns:

• Auto-property has identical performance to the backing field approach
• Validation occurs only during parameter binding, not during processing
• List initialization is appropriately lightweight

✅ Security Concerns

No security issues:

• Input validation is enhanced, not weakened
• The ValidateNotNull attribute prevents a potential null reference attack vector
• No sensitive data exposure in the changes

✅ Test Coverage

Good foundational tests:

• Parameter metadata verification: Confirms the Server parameter exists with correct type and alias (Module/Tests/ResolveDnsBinding.Tests.ps1:4-11)
• Null binding rejection: Verifies the validation attribute prevents null values (Module/Tests/ResolveDnsBinding.Tests.ps1:13-15)

Suggestions for additional test coverage (optional enhancements):

# Test empty list binding
It 'accepts empty Server list' {
    { Resolve-Dns -Name 'example.com' -Server @() } | Should -Not -Throw
}

# Test valid server list binding
It 'accepts valid Server list' {
    { Resolve-Dns -Name 'example.com' -Server @('8.8.8.8', '1.1.1.1') } | Should -Not -Throw
}

🏆 Overall Assessment

This is a high-quality, low-risk improvement that:

• ✅ Enhances parameter validation
• ✅ Maintains backward compatibility
• ✅ Follows C# and PowerShell best practices
• ✅ Includes appropriate test coverage
• ✅ Has minimal surface area for issues

Recommendation: Approve - This PR successfully achieves its goals with no identified issues.

---

[claude]

Claude finished @PrzemyslawKlys's task —— View job

---

PR Review Analysis

Todo List:

• Read and analyze the modified C# cmdlet file
• Read and analyze the new Pester test file
• Review code quality and best practices
• Check for potential bugs or issues
• Evaluate performance considerations
• Assess security concerns
• Review test coverage adequacy
• Provide comprehensive feedback

---

✅ Code Quality & Best Practices

Excellent implementation:

• Clean conversion to auto-property: The change from backing field to auto-property with validation at DnsClientX.PowerShell/CmdletResolveDnsQuery.cs:93 is properly implemented
• Preserved backward compatibility: The [Alias("ServerName")] is correctly maintained
• Proper validation attribute: [ValidateNotNull] is the right choice for preventing null binding
• Consistent initialization: = new List<string>() provides proper default empty list

✅ Potential Bugs/Issues

No issues found:

• The validation attribute will properly prevent null parameter binding at the PowerShell level
• Existing null checks in the processing logic (lines 353, 443) remain as defensive programming
• The auto-property maintains the same public interface and behavior

✅ Performance Considerations

No concerns:

• Auto-property has identical performance to the backing field approach
• Validation occurs only during parameter binding, not during processing
• List initialization is appropriately lightweight

✅ Security Concerns

No security issues:

• Input validation is enhanced, not weakened
• The ValidateNotNull attribute prevents a potential null reference attack vector
• No sensitive data exposure in the changes

✅ Test Coverage

Good foundational tests:

• Parameter metadata verification: Confirms the Server parameter exists with correct type and alias (Module/Tests/ResolveDnsBinding.Tests.ps1:4-11)
• Null binding rejection: Verifies the validation attribute prevents null values (Module/Tests/ResolveDnsBinding.Tests.ps1:13-15)

Suggestions for additional test coverage (optional enhancements):

# Test empty list binding
It 'accepts empty Server list' {
    { Resolve-Dns -Name 'example.com' -Server @() } | Should -Not -Throw
}

# Test valid server list binding
It 'accepts valid Server list' {
    { Resolve-Dns -Name 'example.com' -Server @('8.8.8.8', '1.1.1.1') } | Should -Not -Throw
}

🏆 Overall Assessment

This is a high-quality, low-risk improvement that:

• ✅ Enhances parameter validation
• ✅ Maintains backward compatibility
• ✅ Follows C# and PowerShell best practices
• ✅ Includes appropriate test coverage
• ✅ Has minimal surface area for issues

Recommendation: Approve - This PR successfully achieves its goals with no identified issues.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 65.35%. Comparing base (aff8f2d) to head (7f03c9f).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #470   +/-   ##
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  Coverage   65.35%   65.35%           
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  Files          98       98           
  Lines        5158     5158           
  Branches     1063     1063           
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  Hits         3371     3371           
  Misses       1391     1391           
  Partials      396      396           

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[Copilot]

Pull request overview

This PR enhances the Resolve-Dns cmdlet's Server parameter by converting it from a public field to an auto-property with ValidateNotNull attribute, while maintaining backward compatibility through the ServerName alias. It also introduces comprehensive binding tests to ensure the parameter metadata and null handling are correctly enforced.

Key Changes

• Converted the Server parameter from a public field to an auto-property with ValidateNotNull attribute
• Added Pester tests to verify parameter metadata (alias, type) and null value rejection behavior

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
DnsClientX.PowerShell/CmdletResolveDnsQuery.cs	Converted Server parameter to validated auto-property with ValidateNotNull attribute
Module/Tests/ResolveDnsBinding.Tests.ps1	Added new test file to verify Server parameter binding behavior and null handling