[TestClass]
public class HealthCheckHttpTriggerTests
{
    private const string CategoryIntegration = "Integration";
    private const string CategoryE2E = "E2E";

    private const string DefaultServerName = "Localhost";
    private const string ServerNameKey = "ServerName";

    private ServerFixture _fixture;

    [TestInitialize]
    public void Init()
    {
        // Gets the server name from the environment variable.
        var serverName = Environment.GetEnvironmentVariable(ServerNameKey);
        if (string.IsNullOrWhiteSpace(serverName))
        {
            serverName = DefaultServerName;
        }
        
        // Creates the fixture from the factory method pattern.
        this._fixture = ServerFixture.CreateInstance(serverName);
    }

    ...

    [TestMethod]
    [TestCategory(CategoryIntegration)]
    // Adds the test category for end-to-end testing
    [TestCategory(CategoryE2E)]
    public async Task Given_Url_When_Invoked_Then_Trigger_Should_Return_Healthy()
    {
        ...
    }
}