public void GetFooByIdShouldReturnAValidFooObject()
{
var id = Guid.NewGuid();
var name = "bar";
var foo = new Foo(id, name);
var fooRepository = new Mock <IFooRepository>();
fooRepository.Setup(x => x.GetFooById(It.IsAny <Guid>()))
.Returns(foo);
var fooService = new FooService(fooRepository.Object);
var fooResult = fooService.GetFooById(id);
fooRepository.Verify(x => x.GetFooById(It.IsAny <Guid>()), Times.Once);
Assert.NotNull(foo);
Assert.Equal(id, foo.Id);
Assert.Equal(name, foo.Name);
}