HelloWorldFunctionTest.cs

[Collection(nameof(FunctionTestCollection))]
public class HelloWorldFunctionTest
{
    private readonly FunctionTestFixture _fixture;
    private HttpResponseMessage _response;

    public HelloWorldFunctionTest(FunctionTestFixture fixture)
    {
        _fixture = fixture;
    }

    [Fact]
    public void Hello_World_Function_Test()
    {
        this.BDDfy();
    }

    private async Task When_The_HelloWorld_Function_Is_Invoked()
    {
        _response = await _fixture.Client.GetAsync("api/HelloWorld?name=James+Bond");
    }

    private async Task Then_The_Response_Should_Include_The_Caller_Name()
    {
        Assert.EndsWith("James Bond", await _response.Content.ReadAsStringAsync());
    }
}