Port Singleton Tests

[WanjohiSammy]

Issues

This pull request fixes #xxx.

Description

Port Singleton Tests from WCF to use AspNetCoreOData

• test/EndToEndTests/Tests/Client/Build.Desktop/SingletonTests

Checklist (Uncheck if it is not completed)

• Test cases added
• Build and test with one-click build and test script passed

Additional work necessary

If documentation update is needed, please add "Docs Needed" label to the issue and provide details about the required document change in the issue.

Copilot reviewed 8 out of 11 changed files in this pull request and generated no comments.

Files not reviewed (3)

• test/EndToEndTests/Tests/Client/Microsoft.OData.Client.E2E.Tests/Common/Client/Default/DefaultServiceCsdl.xml: Language not supported
• test/EndToEndTests/Tests/Client/Microsoft.OData.Client.E2E.Tests/Common/Server/Default/DefaultEdmModel.cs: Evaluated as low risk
• test/EndToEndTests/Common/Microsoft.OData.Client.E2E.TestCommon/Helpers/ODataValueAssertEqualHelper.cs: Evaluated as low risk

Comments suppressed due to low confidence (1)

test/EndToEndTests/Tests/Client/Microsoft.OData.Client.E2E.Tests/SingletonTests/Tests/SingletonUpdateTests.cs:96

• Add a check to ensure that 'properties' is not empty before using it.

var properties = new[] { new ODataProperty { Name = "City", Value = cities[mimeType] } };