C#•2y ago

Parameterized Unit Testing Class Types

I have the following test in xUnit:

    [Fact]
    public async Task QaTrackUrls_Should_Connect() {
        var context = new QaTrackContext();
        //var property = typeof(IModelBase).GetProperty("RequestUrl").GetValue(model).ToString();

        var result = await context.GetAsync<ServiceEventModel>(ServiceEventsModel.RequestUrl);

        Assert.True(result.IsSuccess);
    }

    [Fact]
    public async Task QaTrackUrls_Should_Connect() {
        var context = new QaTrackContext();
        //var property = typeof(IModelBase).GetProperty("RequestUrl").GetValue(model).ToString();

        var result = await context.GetAsync<ServiceEventModel>(ServiceEventsModel.RequestUrl);

        Assert.True(result.IsSuccess);
    }

I want to parameterize the test by giving classes (like ServiceEventsModel) instead of writing each one manually. so far, I've tried this:

    [Theory]
    [InlineData(typeof(ServiceEventsModel))]
    public async Task QaTrackUrls_Should_Connect(Type model) {
        var context = new QaTrackContext();
        var property = typeof(IModelBase).GetProperty("RequestUrl").GetValue(model).ToString();

        var result = await context.GetAsync<model>(property);

        Assert.True(result.IsSuccess);
    }

    [Theory]
    [InlineData(typeof(ServiceEventsModel))]
    public async Task QaTrackUrls_Should_Connect(Type model) {
        var context = new QaTrackContext();
        var property = typeof(IModelBase).GetProperty("RequestUrl").GetValue(model).ToString();

        var result = await context.GetAsync<model>(property);

        Assert.True(result.IsSuccess);
    }

but

context.GetAsync<model>

context.GetAsync<model>

gives an error

 'model' is a variable but is used like a type

 'model' is a variable but is used like a type

making it typeof(model) doesn't work and creates more errors.

Joschi•5/17/24, 10:01 PM

You cannot use a Type object as a type parameter.
You need to use reflection, to create the correct method at runtime and invoke it.

https://learn.microsoft.com/en-us/dotnet/api/system.reflection.methodinfo.makegenericmethod?view=net-8.0

MethodInfo.MakeGenericMethod(Type[]) Method (System.Reflection)

Substitutes the elements of an array of types for the type parameters of the current generic method definition, and returns a MethodInfo object representing the resulting constructed method.

SaiyanslayerOP•5/17/24, 10:43 PM