Add unit tests for OperatorRequestHandler

[Copilot]

OperatorRequestHandler had no test coverage. This adds 10 unit tests covering all 5 MediatR handler methods with both success and failure paths.

Tests added

• GetOperatorsQuery – returns operator list on success; propagates failure
• GetOperatorQuery – returns single operator model on success; propagates failure
• CreateOperatorCommand – returns success result; propagates failure
• UpdateOperatorCommand – returns success result; propagates failure
• GetOperatorsForDropDownQuery – returns drop-down model list on success; propagates failure

Each test mocks IApiClient, asserts the result state via Shouldly, and verifies the correct client method is called exactly once.

[Fact]
public async Task Handle_GetOperatorsQuery_ReturnsSuccess_WhenApiClientSucceeds()
{
    var query = new OperatorQueries.GetOperatorsQuery(CorrelationIdHelper.New(), Guid.NewGuid());
    _mockApiClient
        .Setup(c => c.GetOperators(query, It.IsAny<CancellationToken>()))
        .ReturnsAsync(Result.Success(operators));

    var result = await _handler.Handle(query, CancellationToken.None);

    result.IsSuccess.ShouldBeTrue();
    _mockApiClient.Verify(c => c.GetOperators(query, It.IsAny<CancellationToken>()), Times.Once);
}

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• f.feedz.io
  • Triggering command: /usr/bin/dotnet dotnet test EstateManagementUI.BlazorServer.Tests/EstateManagementUI.BlazorServer.Tests.csproj --filter FullyQualifiedName~OperatorRequestHandlerTests (dns block)
  • Triggering command: /opt/hostedtoolcache/CodeQL/2.24.0/x64/codeql/csharp/tools/linux64/Semmle.Autobuild.CSharp /opt/hostedtoolcache/CodeQL/2.24.0/x64/codeql/csharp/tools/linux64/Semmle.Autobuild.CSharp (dns block)
  • Triggering command: /usr/bin/dotnet dotnet restore --no-dependencies /home/REDACTED/work/EstateManagementUI/EstateManagementUI/EstateManagementUI.sln --packages /home/REDACTED/work/EstateManagementUI/.codeql-scratch/dbs/csharp/working/packages /p:DisableImplicitNuGetFallbackFolder=true --verbosity normal /p:TargetFrameworkRootPath=/home/REDACTED/work/EstateManagementUI/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot /p:NetCoreTargetingPackRoot=/home/REDACTED/work/EstateManagementUI/.codeql-scratch/dbs/csharp/working/emptyFakeDotnetRoot /p:AllowMissingPrunePackageData=true (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

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This section details on the original issue you should resolve

<issue_title>OperatorRequestHandler Unit Tests</issue_title>
<issue_description>Ensure a good level of code coverage as close to 100% as possible</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes OperatorRequestHandler Unit Tests #784

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