public void a_query_handler_is_mandatory()
{
var storage = Substitute.For<IFileStorage>();
var container = Substitute.For<IContainer>();
var scope = Substitute.For<IContainerScope>();
var query = Substitute.For<Query<string>>();
storage.PopQueryAsync().Returns(Task.FromResult((IQuery)query));
container.CreateScope().Returns(scope);
scope.ResolveAll(typeof(IQueryHandler<Query<string>, string>))
.Returns(new object[0]);
var sut = new ContainerQueryBus(container);
var task = sut.QueryAsync(query);
Action actual = task.Wait;
actual.ShouldThrow<CqsHandlerMissingException>();
}
public async Task invoke_the_handler_successfully()
{
var storage = Substitute.For<IFileStorage>();
var container = Substitute.For<IContainer>();
var scope = Substitute.For<IContainerScope>();
var handler1 = Substitute.For<IQueryHandler<Query<string>, string>>();
var query = Substitute.For<Query<string>>();
handler1.ExecuteAsync(query).Returns(Task.FromResult("Hello world"));
storage.PopQueryAsync().Returns(Task.FromResult((IQuery)query));
container.CreateScope().Returns(scope);
scope.ResolveAll(typeof(IQueryHandler<,>).MakeGenericType(query.GetType(), typeof(string)))
.Returns(new object[] { handler1 });
var sut = new ContainerQueryBus(container);
var actual = await sut.QueryAsync(query);
actual.Should().Be("Hello world");
}
public void allow_only_one_query_handler()
{
var storage = Substitute.For<IFileStorage>();
var container = Substitute.For<IContainer>();
var scope = Substitute.For<IContainerScope>();
var handler1 = Substitute.For<IQueryHandler<Query<string>, string>>();
var handler2 = Substitute.For<IQueryHandler<Query<string>, string>>();
var query = Substitute.For<Query<string>>();
storage.PopQueryAsync().Returns(Task.FromResult((IQuery)query));
container.CreateScope().Returns(scope);
scope.ResolveAll(typeof(IQueryHandler<,>).MakeGenericType(query.GetType(), typeof(string)))
.Returns(new object[] { handler1, handler2 });
var sut = new ContainerQueryBus(container);
var task = sut.QueryAsync(query);
Action actual = task.Wait;
actual.ShouldThrow<OnlyOneHandlerAllowedException>();
}
public async Task do_not_catch_handler_Exceptions()
{
var container = Substitute.For<IContainer>();
var scope = Substitute.For<IContainerScope>();
var handler1 = Substitute.For<IQueryHandler<Query<string>, string>>();
var query = Substitute.For<Query<string>>();
handler1
.When(x => x.ExecuteAsync(query))
.Do(x => { throw new InvalidCastException(); });
container.CreateScope().Returns(scope);
scope.ResolveAll(typeof(IQueryHandler<,>).MakeGenericType(query.GetType(), typeof(string)))
.Returns(new object[] { handler1 });
var sut = new ContainerQueryBus(container);
try
{
sut.QueryAsync(query).Wait();
Assert.False(true, "Query did not fail");
}
catch (AggregateException exception)
{
scope.Received().ResolveAll(typeof (IQueryHandler<,>).MakeGenericType(query.GetType(), typeof (string)));
exception.InnerException.Should().BeOfType<InvalidCastException>();
}
}