Fix failing test job: 'The argument ...CourseRegistration.Tests.dll is invalid'

[Hemavathi15sg]

The action job for build and test is failing due to an invalid test argument error:

The argument ...CourseRegistration.Tests.dll is invalid. Please use the /help option to check the list of valid arguments.

Cause:

• The test script tried to run the dotnet test command on a DLL instead of the .csproj file. The dotnet test command requires the path to a test project file (e.g., .csproj), not a compiled DLL.

Solution:

• In .github/workflows/ci-cd.yml, make sure the Test step uses the project file path:

- name: Test
  run: dotnet test api/CourseRegistration.Tests/CourseRegistration.Tests.csproj --configuration Release --no-build --logger trx

• Ensure the environment variable TEST_PROJECT (if used) points to the .csproj and not a DLL.

Reference job log and workflow file:

• Job Log: see failing step with invalid argument error
• Workflow: .github/workflows/ci-cd.yml

After applying the fix, re-run the pipeline to verify the tests execute correctly.