func TestLastItemCollector(t *testing.T) {
Convey("Given I have a context", t, func() {
context := rivers.NewContext()
Convey("And a stream of data", func() {
in, out := stream.New(2)
out <- 1
out <- 2
close(out)
Convey("When I apply the collector consumer", func() {
var number int
consumer := consumers.LastItemCollector(&number)
consumer.Attach(context)
consumer.Consume(in)
Convey("Then data is collected out of the stream", func() {
So(number, ShouldResemble, 2)
_, opened := <-in
So(opened, ShouldBeFalse)
})
})
Convey("When I apply the collector consuming data into a non pointer", func() {
var number int
collect := func() {
consumers.LastItemCollector(number)
}
Convey("Then it panics", func() {
So(collect, ShouldPanicWith, consumers.ErrNoSuchPointer)
})
})
})
})
}
func (pipeline *Pipeline) CollectLastAs(data interface{}) error {
return pipeline.Then(consumers.LastItemCollector(data))
}